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Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

In order to solve the difficulty of testing large mirror, the sub-aperture stitching interferometry (SSI) is proposed and expatiated. The basic theory and principle of this method are introduced and analyzed. A reasonable stitching algorithm and mathematical model are established based on least-squares fitting, triangulation algorithm, homogeneous coordinate transformation, etc., and the relative program and flow chart are established. Some marked points are used to accomplish the alignments between sub-apertures and calibrate the relationship between the coordinate of the mirror and the pixel. With engineering examples, a large rectangular mirror with an irregular aperture of 720×165 (mm) is tested by SSI. The peak-to-valley and root mean square of the stitched surface error are 0.451 λ and 0.042 λ (λ is 632.8 nm), respectively. © 2015 Chinese Optics Letters.


Han C.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2015

The whole performance of an electro-optical imaging system consisting of optical systems and array detectors was explored and optimizing design of the system was discussed. As array detectors were developed and updated in a higher speed, how to improve the optical system to optimize the whole performance of electro-optical imaging system was researched. According to the sampling theory of the sampled electro-optical imaging system, the Modulation Transfer Function(MTF) characteristics of the electro-optical imaging system were studied and the MTF phase average concept for the sampled electro-optical imaging system was discussed. Then, the effect of fabrication and use errors of the electro-optical imaging system on the MTF was analyzed and the calculation formulas of the signal-to-noise ratio of the electro-optical imaging system were given. For a remote sensing electro-optical imaging system, it suggests that the optical system MTF normalized spatial frequency should be set to be 0.5 for matching with the Nyquist frequency of the array detector. By which the system satisfies the demand of the signal-to-noise ratio, the MTF at Nyqust frequency reaches 0.1, and the resolution power is close to Nyquist frequency without the spectrum aliasing. ©, 2015, Chinese Academy of Sciences. All right reserved.


Li R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

Aspheric elements are widely applied in optical systems and the vertex radius of curvature (VROC) is one of the important fundamental parameters of an asphere. We present a method for measuring the VROC of asphere. We use a portable laser tracker to measure the optical interval of the null testing path and then determine the VROC of the asphere through ray tracing. Based on this method, we carry out an accurate measurement. The accuracy can reach up to 0.056 mm on an asphere with VROC of approximately 2 m and the relative error is 0.003%. © 2015 Chinese Optics Letters.


Guo Y.,Northeast Normal University | Guo W.,Northeast Normal University | Yang Y.,Northeast Normal University | Jia Y.,Northeast Normal University | Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Physical Chemistry Chemical Physics | Year: 2014

A series of hierarchical Bi12TiO20-graphene nanoarchitectures (Bi12TiO20-GR) with GR loadings from 1% to 10% are fabricated by a single-step solvothermal treatment technique, and the intimate interfacial contact between flexible GR sheets and flower-like Bi 12TiO20 nanocrystals is observed in the Bi 12TiO20-GR composites. As a novel composite photocatalyst, Bi12TiO20-GR with GR loading of 2% possesses the highest simulated sunlight photocatalytic activity towards the degradation of two typical organic pollutants, methyl orange (MO) and p-nitrophenol (PNP). Furthermore, the separation and transportation of the photogenerated carriers in the simulated sunlight-irradiating Bi12TiO20-GR system is studied, meanwhile, the active species (hVB +, O 2 - and OH) generated in the Bi12TiO 20-GR-photocatalyzed PNP degradation system are identified by free radical and hole scavenging experiments. Based on the experimental and theoretical results, the mechanism and pathway of photocatalytic degradation of PNP in the simulated sunlight-irradiating Bi12TiO20-GR system are proposed. © 2014 the Owner Societies.


Cao P.,Changchun Institute of Technology | Bai Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2013

Zinc oxide materials with outstanding performance are the broadband gap semiconductor, and make it a number of important subjects and a wide range of applications. In this paper, a Co-doped ZnO film grown by electrodeposition shows room-temperature ferromagnetic properties after the ammine plasma treatment. The XPS spectra show that the Co ions have a chemical valence of 2+ and a few nitrogen atoms was incorporated into ZnCoO film during the treatment process to occupy oxygen positions. The electronic properties also give evidence that nitrogen is incorporated into ZnCoO film. So the ferromagnetism is mediated though the p-d exchange interaction between nitrogen induced carriers and Co atoms. © (2013) Trans Tech Publications, Switzerland.


Xue D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

In order to realize testing of a large aperture convex sphere, large aperture standard transmission spheres are designed and manufactured. The system focal length of 4400 mm, Φ 350 mm aperture are required. The design and performance comparison, surface quality and radius of curvature testing, large aperture SiC convex sphere surface testing are complished. The simulation result analysis of optical design software shows that the wavefront performance of the system design is 0.0001λ [peak to valley (PV), λ=632.8 nm], and it can offer a high-quality spherical wave and the reference spherical surface quality is up to 0.088λ (PV, λ=632.8 nm), 0.006λ [root mean square (RMS), λ=632.8 nm]. For a SiC convex sphere of Φ320 mm aperture and 4092 mm radius of curvature the manufactured results of the surface quality are up to 0.102λ (PV, λ=632.8 nm), 0.011λ (RMS, λ=632.8 nm). The results indicates that the large aperture standard transmission spheres are helpful for the testing large aperture convex sphere surface with large radius of curvature, the highly precision testing is complished only by standard sphere and non-null testing method based on digital mask, and the problems of large-aperture convex asphere or freeform mirror testing are solved.


Zhu W.-B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

According to the lower calibration accuracy of camera parameters in a three-dimensional laser scanning measurement, a kind of stepwise iterative algorithm was proposed to solve the problem that the distance between calibration plate and optical camera system was fixed data. The algorithm based on distance calibration was improved by the error correction to enhance the measurement accuracy. A cylinder with a diameter of 228.0 mm and a height of 260.0 mm was measured in the experiments. The obtained results show that the relative error is 11.1% without modification. However, after first amendment, the relative error is 0.67%; after second correction, the relative error is 0.43%, and the relative error of the third amendment is the same as that of the second amendment. These results show that this algorithm has fast convergent speed and high reliability and improves calibration accuracy greatly.


Ni Q.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A two-dimensional photon-counting imaging detector in Extreme Ultraviolet (EUV) region was developed for the CE-3 EUV camera. The detector is mainly composed of spherical surface microchannel plate (MCP) stacks operating in a pulse-counting mode, a wedge-strip position-sensitive anode with a period of 1.5 mm and a diameter of 47 mm and a correlative analog and data processing circuit with a maximum rate 200 kHz. The origin of dark noise from the MCP detector and its effect on the signal to noise ratio of the image for EUV camera was analysed. In order to obtain less background noise, the MCP stacks were set in a 380°C backout for 18 hours and 100 μAh bake-in for the preconditions. Then, the dark counting rate and its Pulse Height Distribution (PHD) were measured before and after preconditionings. Furthermore, the external factors leading to increase the dark noise also were analysed, including MCP channel demage, MCP channel contemination from the improper storage of MCP, high operating temperature and the electromagnetism disturbance from the long lines between divided resistances and MCP stacks. Finally, the dark noise satisfies the requirement of EUV camera by removing the main external factors.


Li R.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

As the control of off-axis in the off-axis asphere manufacture is a key of the optical design, this paper proposes a testing method for the off-axis using a portable and precise laser tracker in the null compensating interferometry. Firstly, the optical path of the null testing and compensating was adjusted according to the aberration theory. Then, the reference surface on the compensator and the off-axis asphere was tested with the laser tracker. Finally, the collected data from reference surface was processed, constructed, coordinated and calculated, and the off-axis of the asphere was obtained directly by comparing the central point of asphere and the tested optical axis position. The measurement precision was analyzed in detail, and the off-axis testing experiment was performed with a rectangular off-axis asphere. The test result shows that the testing precision can achieve 0.042 mm. The method is also can be used in measuring the offsets of a coaxial asphere element and a spherical element.


Guo X.,Jilin University | Di W.,Jilin University | Chen C.,University of Maine, United States | Liu C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Dalton Transactions | Year: 2014

The previous works by our group (Chem. Commun., 2010, 46, 2304-2306; ACS Catal., 2013, 3, 405-412; Phys. Chem. Chem. Phys., 2013, 15, 14681-14688) have reported the near-infrared-driven photocatalysis of broadband semiconductor TiO2 or ZnO that was combined with upconverting luminescence particles to form a core-shell structure. However, the photocatalytic efficiency is low for this new type of photocatalysts. In this work, NaYF 4:Yb,Tm/CdS/TiO2 composites for NIR photocatalysis were prepared by linking CdS and TiO2 nanocrystals on the NaYF 4:Yb,Tm microcrystal surfaces. CdS and TiO2 were well interacted to form a heterojunction structure. The energy transfer between NaYF4:Yb,Tm and the semiconductors CdS and TiO2 was investigated by steady-state and dynamic fluorescence spectroscopy. The photocatalytic activities of the as-prepared composites were evaluated by the degradation of methylene blue in aqueous solution upon NIR irradiation. Significantly, it was found that the united adhesions of CdS and TiO2 on the NaYF4:Yb,Tm particle surfaces showed much higher catalytic activities than the individual adhesion of CdS or TiO2 on the NaYF4:Yb,Tm surfaces. This was attributed mainly to the effective separation of the photogenerated electron-hole pairs due to the charge transfer across the CdS-TiO2 interface driven by the band potential difference between them. The presented composite structure of upconverting luminescence materials coupled with narrow/wide semiconductor heterojunctions provides a new model for improved NIR photocatalysis. © The Royal Society of Chemistry 2014.


Liu L.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

It is a best way to implement the precise optical test in a vacuum environment for eliminating atmospheric disturbance. However, the vibration isolation between a measuring instrument and a instrument to be measured is a key in the precise optical test. This paper introduces the development status and trends of the Vibration Isolation Systems (VISs) in large space environment simulation facilities for optical testing in the world, which include horizontal and vertical testing systems and their vibration isolation methods. Especially, it presents the VISs for the three fundamental key optical tests of the James Webb Space Telescope. Finally, it gives some suggestions for research and development of the VISs for the next generation space environment simulation test facilities for large aperture and high resolution optical remote sensors.


Liu L.,Changchun University of Science and Technology | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

To improve the adaptive capacity of a space camera to environment temperatures and to enhance its imaging quality, this paper explores how to implement the thermal control by relaxing thermal control indictors. A mathematical formula of intercept and defocus affected by temperatures is derived for a pure off-axis Three Mirror Anastigmatism(TMA) optical system. The analysis shows that camera defocus amount and temperature are a linear relationship. Then, a constant K value is calculated. Furthermore, it indicates when reflector and camera structures have the same coefficient of linear expansion, the defocus does not occur. However, the greater the difference between two material linear expansion coefficients is, the greater the amount of defocus is. With defocusing formula, it suggests that mechanical focusing methods must be used to request for compensation when the camera temperature level changes more than ± 1°C(corresponding to the defocus amount of 0.05 mm). Using integrated photo-thermal simulation method , the temperature range Δt is obtained to ensure the image quality of the camera. Finally, camera's focus range is derived by using the formula of defocus. The result of defocus test under thermal vacuum environment verifies the correctness of the defocus formula and the defocus amount of ± 0.184 mm is a proper focus range corresponding camera temperature levels changed in ± 4°C.


Xu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan Y.-J.,Changchun University of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A novel flexible support structure for the 1-m primary mirror of a space camera was introduced. By taking the material selection, diameter-thickness ratio, number and positions of support points, and lightweight forms as design variables and the surface figure accuracy rms of the mirror under the self-weight as objective function, a kind of back opening SiC space mirror with triangle lightweight holes and three-point support on the back was designed optimally. Then, the flexible support structure was designed for the primary mirror. Through sensitivity analysis, the parameters of flexible support structure that effect on rms of mirror were found when its optical axis was on the horizontal state. By using finite element method, the dynamic and static stiffnesses as well as thermal character of the primary mirror subassembly were analyzed. The results indicate that surface accuracy of the mirror has reached rms 5.6 nm and 2.7 nm under gravity perpendicular to optical axis and a uniform temperature rise of 4°C, respectively, and the fundamental frequency of the primary mirror subassembly is 192 Hz. Finally, dynamics test was performed in the laboratory, experimental results indicate that the first-order natural frequency is 197 Hz and the maximum stress is 181 MPa, which verifies the accuracy of FEA. Obtained results satisfy the requirements of space application.


Huang J.,Nanjing University of Aeronautics and Astronautics | Zhang J.-H.,Nanjing University of Aeronautics and Astronautics | Wang S.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

This paper researches how to improve the performance and applications of micromixers used in mixing micro-liquids, because most of the existing micromixers need external power sources, and can only mix fluids but can not transport them. A valveless piezoelectric pump with multistage Y-shape tubes which integrates both functions of mixing and transporting is developed to overcome above shortcomings. Firstly, a multistage Y-shape tube is proposed, then a valveless piezoelectric pump with multistage Y-shape tubes is designed and its working principle is analyzed. Furthermore, the flow resistance characteristics and the flow rate of the valveless piezoelectric pump are analyzed theoretically. Meanwhile, finite element software is employed in simulating the flow fields of the pump numerically. The results show that the piezoelectric pump has a function of one-way transmission. Finally, the valveless piezoelectric pump is fabricated, the relationships between flow rate and driving frequency, as well as that between back pressure and driving frequency are experimentally investigated. The experimental results show that the maximum flow rate is 16.2 mL/min under a peak-to-peak voltage of power supply in 100 V(16 Hz), and the maximum back pressure is obout 64 mmH2O under a peak-to-peak voltage of power supply in 100 V (14 Hz). The obtained experimental results validate the feasibility of the valveless piezoelectric pump with multistage Y-shape tubes.


Liu D.,Northeast Normal University | Lu Y.,Northeast Normal University | Tan H.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang T.-T.,Northeast Normal University | Wang E.-B.,Northeast Normal University
Crystal Growth and Design | Year: 2015

A family of polyoxometalate compounds based on 1:13 polyoxoanions [MnV13O38]7-, organic molecules, and lanthanide cations, H[{La2(DMF)5(H2O)4}{MnV13O38}]·DMF·5H2O (1), H[{Ce2(DMF)2(H2O)7}{MnV13O38}]·0.5DMF·5.5H2O (2), H2[{K(H2O)2}2{Nd(DMF)(H2O)3}{MnV13O38}]·5H2O (3), H[{Ln2(C6H5NO2)3(H2O)6}{[MnV13O38}]·C6H5NO2·10H2O (Ln = La 4, Ce 5), and H2.5[{Pr(C6H5NO2)(H2O)3.5}{Pr0.5(H2O)2}{MnV13O38}]·0.5C6H5NO2·10H2O (6) (DMF = N,N-dimethylformamide; C6H5NO2 = isonicotinic acid), have been obtained utilizing a conventional method of aqueous solution and further characterized by elemental analysis, IR spectrum, UV spectrum, thermogravimetric analysis, and single-crystal X-ray diffraction. Compounds 1 and 2 exhibit a one-dimensional extended chain structure constructed by [MnV13O38]7- and lanthanide-organic coordination linkage, while compound 3 reveals three-dimensional (3D) open framework formed by polyoxoanion-lanthanide chains and potassium cations. Compounds 4-6 exhibit 3D supramolecular framework architectures based on [MnV13O38]7- polyoxoanions and lanthanide-organic coordination units. These compounds represent the first examples of extended organic-inorganic hybrids built up by [MnV13O38]7- building blocks and rare earth cations. The influences of the lanthanide contraction effect on the structural alterations from 1 to 3 and from 4 to 6 have been disscussed. The electrochemical and electrocatalytic properties for compounds 1-6 have been studied. Magnetic studies indicate that antiferromagnetic interactions exist in compounds 1-6. © 2014 American Chemical Society.


Zhang S.,Shandong University | Ding T.C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li J.F.,Shandong University
Production Engineering | Year: 2012

In the present study, an experimental investigation was conducted to determine the effects of surface texture, cutting parameters and phase transformation on the surface and in-depth residual stress distributions induced by hard milling of AISI H13 steel (50 ± 1HRc) with the coated carbide tools. The results show that the surface residual stress distribution between two adjacent machined lays has the same periodic variational regularity as the surface profiles, which means that the surface residual stress distribution has a high correlation with the machined surface texture. Surface residual stresses in the pick direction are much more compressive than that in the feed direction; at the same time, radial depth of cut and feed are the main cutting parameters affecting surface residual stresses. Very thin white layer forms or even no obvious microstructural alteration appears in the subsurface. Phase transformations of the subsurface material deeply affect the in-depth residual stress distribution, a 'hook' shaped residual stress profile beneath the machined surface is generated in which the maximum compressive stresses occur at the depth of 3-18 μm below the surface. © 2012 German Academic Society for Production Engineering (WGP).


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

Spaceborne ocean colour remote sensing urgently requires large relative-aperture and wide field of view imaging spectrometer. Based on the research objective of large relative-aperture and wide field of view, a spaceborne imaging spectrometer optical system is designed using a folded Schmidt telescope and a modified Dyson spectral imaging system. The relative-aperture of which is 1/1.2, the field of view of hyperspectral image is 3.9°, and the working waveband is from 0.35 μm to 1.05 μm. Based on the aberration theory, the principle of spherical aberration correcting is analyzed in modified Dyson spectral imaging system. Ray tracing, optimization and the analysis of the design results are performed by ZEMAX software. The analyzed results demonstrate that the MTFs for different wavelengths are all about 0.77, both the line bending and the band bending of the spectrum are less than 6% of the pixel, which is easy for spectral and radiometric calibration. The design results satisfy the requirements of specifications with a small volume and suitable for spaceborne remote sensing.


Sun J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

Telescope alignment technique is a useful method which can efficiently improve the image quality of the optical systems. The third order astigmatism of field dependence was analyzed to collimate a Rithey-Chretien telescope of zero-coma with the stop at the primary mirror. The algorithm of calculating the astigmatism amplitude and angle was studied according to the major axis length and eccentricity of out-of-focus stellar ellipse, and the other auxiliary alignment method was verified by means of the astigmatism property. For realizing the alignment technique, the optical software Zemax and Matlab were programmed and emulated. The out-of-focus stellar astigmatism amplitudes and angles of full 8 fields were analyzed by means of the first alignment method, and the results were compared with the ones getting from the Zemax. Then the perturbation of other third order optical aberration such as coma and spherical aberration was analyzed. Combining the project application, the implementation means of the technique were finally discussed in practice. The emulation result shows that the method has good accuracy, anti-interference ability and practical application values.


Cao S.,Taiyuan University of Technology | Cao S.,Ningbo University of Technology | Zheng J.,Ningbo University of Technology | Zhao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 6 more authors.
Journal of Materials Chemistry C | Year: 2013

We demonstrate a strategy for the growth of Mn2+ ion doped cadmium based II-VI semiconductor quantum dots (QDs) with a designed buffer layer of ZnS (MnS/ZnS/CdS or Mn:CdS QDs), which aims to meet the challenge of obtaining highly efficient and well-resolved Mn2+ ion emission. First, small, high quality MnS cores are obtained by using thiols to replace conventional alkyl amines as capping ligands. Then a buffer layer of ZnS with a tailored thickness is introduced to the QDs before the growth of CdS shells to reduce the size mismatch between the Mn2+ (dopant) and Cd 2+ (host) ions. The fabricated MnS/ZnS/CdS core/shell QDs exhibit a high PL QY of up to 68%, which is the highest ever reported for any type of Mn2+ ion doped cadmium based II-VI semiconductor QD. The photoluminescence (PL) of the QDs consists of well-resolved Mn2+ ion emission without any detectable emission from the CdS band edge or surface defects. In addition, our MnS/ZnS/CdS QDs cannot only be made water-soluble, but can also be coated by ligands with short carbon chain lengths, nearly without cost to the PL QY, which could make them strong candidates for practical applications in biology/biomedicine and opto/electronic devices. © The Royal Society of Chemistry 2013.


Lu N.,Northeast Normal University | Zhao Y.,Northeast Normal University | Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo Y.,Northeast Normal University | And 4 more authors.
Journal of Hazardous Materials | Year: 2012

A series of polyoxometallate/titania (H 3PW 12O 40/TiO 2) composite films with different H 3PW 12O 40 loadings (6.3%, 7.7%, 14.7% and 16.7%) were prepared by a modified sol-gel-hydrothermal route followed by a spin-coating method. The smooth films are constructed by the well-distributed H 3PW 12O 40/TiO 2 sphere with particle size in the range from 80 to 100nm, and the bandgap of the composite films is somewhat narrower compared with as-prepared pure TiO 2 film. As a novel photocatalytic material, the photocatalytic performances of the H 3PW 12O 40/TiO 2 composite films were evaluated by the degradation and mineralization of an aqueous dye Rhodamine B (RB) under solar simulating Xe lamp irradiation (320nm<λ<780nm), and the enhanced photocatalytic activity in comparison to pure TiO 2 film as well as the H 3PW 12O 40/TiO 2 and Degussa P25 TiO 2 powder was obtained. Additionally, the composite films can be reused at least for three times without losing their catalytic activity. © 2011 Elsevier B.V.


Chen Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advances in Engineering Materials and Applied Mechanics - Proceedings of the 5th International Conference on Machinery, Materials Science and Engineering Applications, MMSE 2015 | Year: 2016

In this paper, the performance comparison between glass ceramics (Zerodur) and Silicon Carbide (SiC), which are two kinds of common materials used for space optical reflector, is carried out, and several lightweight structure forms are analyzed. The oval plane reflector is applied in ultra-low temperature environment of space, by taking this kind of reflector as an example, its lightweight structure is optimized by CAD, then through finite element analysis, deformation of the planar lightweight mirror is 0.014λ (rms) in gravity condition, and deformation is 0.002λ (rms) in ultra-low temperature of −150 degrees environment. The actual lightweight processing is controlled by the CNC system in a graphical way, and a chemical method is used to eliminate the stress and micro crack generated during processing, its final surface shape precision reaches 0.022λ (rms). Finally, this paper introduces the manufacture method of novel Silicon Carbide (SiC), and analyzes the current situation and development trends of the spatial lightweight reflector manufacturing technology. © 2016 Taylor & Francis Group, London.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015

For the purpose to overcome the difficulty of testing aspheric surfaces by null lens or CGH (Computer-Generated Hologram), the non-null testing was proposed. The basic principle and theory of testing asphere by digital plane, partial compensation and subaperture stitching interferometry (SSI) were analysed and researched, and each testing model and flow chart were established. Combining examples, an asphere of little departure with the aperture of 350 mm was tested by the digital plane and SSI, respectively. As results, the difference of PV and RMS error between SSI and partial compensation is 0.015λ and 0.002λ (λ is 632.8 nm), respectively. The prototype and setup for testing asphere by partial compensation were devised and developed, a precise convex asphere is measured by this method, the PV and RMS of the surface error is 0.183λ and 0.018λ, respectively. ©, 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.


Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optical Engineering | Year: 2015

Convex aspheric surface is tested by a circular amplitude computer-generated hologram (CGH) fabricated with our equipment and techniques, and much research work has been done simultaneously. However, the analysis of the detailed characters of the CGH used in the test system has not been systematically given in detail, including the correct phase, amplitude, and filter condition of the CGH. The calculation equation of the proper duty circle and the phase of the CGH are deduced, the frequency filter condition of the different diffracted orders of the CGH is demonstrated, and the deduction results are validated by the related experiment. The conclusion can help us to determine the radius ratio of the uncontrolled area over the full aperture of the aspheric surface during the process of optical system design, and it also points out that the radius ratio can be reduced by adjusting the radius of curvature of the reference surface and the distance between the reference surface and the convex aspheric surface. The work can assist us in designing the test system efficiently and correctly with CGH. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE).


Zhang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2011

This paper represents a technique to produce the large size optical aspherical mirror by using reaction-bonded silicon carbide to meet the material requirements of the space used mirrors, based on the characters comparison of all types mirror material. Techniques are described in this paper, including the bonding procedure of silicon carbide to form a mirror shape, the CCOM technology for aspheric grinding, polishing on a home-developed tool -FSGJ-2, and the aspheric profilometry. A specialized Offner Null lens is also developed to measure the aspherical mirror with laser interferometer. With the technology depicted in the paper, a 502mm × 298 mm off-axis SiC aspherical mirror is successfully made with a surface accuracy better than 1/50λrms, the final result meets the design requirement. © (2011) Trans Tech Publications.


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

Wide angle and high resolution spaceborne hyperspectral imager are urgently required in space remote sensing system, of which the telescope system requires high spatial resolution in wide field of view. Based on the theory about geometry optics of common-axis three-mirror systems, the design problem of wide-field of view, off-axis three-mirror anastigmatic (TMA) telescope systems of hyperspectral imager were studied. By means of field of view off-axis, an off-axis three-mirror telescope system was designed. The spectral range was 0.4-2.5 μm, and the focal length was 360 mm, the relative aperture wais 1:4, and the field of view was 11.42° . The primary mirror was six order aspheric surface, and the second mirror and third mirror were quadratic surface. Considering the restriction of detectors, a method of split field of view was developed. Split field of view was achieved by means of putting a edge mirror near the focal plane of the telescope. The MTF is more than 0.75 at Nyquist spatial frequency 28 lp/mm, and the image quality approaches to the diffraction limit.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Key Engineering Materials | Year: 2014

In diamond cutting of optical glasses, the magnitude of critical depth of cut for brittle-ductile transition is an important factor affecting the machinability of the work material in terms of production rate and surface quality. In this work, scratching tests with increasing depths of cut were conducted on glass BK7 to evaluate the influence of the cutting fluid properties on the critical depth of cut. Boric acid solutions of different concentrations were selected as cutting fluids in the tests. The resulting scratches were examined utilizing a white light interferometer and the values of the critical depth of cut were determined based on the observations of the micro-morphology of the scratch surfaces produced. Experimental results indicated that compared with the process without cutting fluid action, the critical depth of cut in diamond cutting of glass BK7 can be increased by using boric acid solution as the cutting fluid. © (2014) Trans Tech Publications.


Li D.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Journal of Liquid Crystals and Displays | Year: 2016

In order to meet the wavefront processing requirements of liquid crystal adaptive optics system which match 4 m astronomy telescope, a wavefront processor (LCWP) based on multi-GPU is developed. First, the liquid crystal adaptive optics wavefront processing method is described. The numbers of hartmann detector’s microlenses, Zernike modes and liquid crystal corrector’s drive unit are analyzed, which need to match 4 m telescope. Then the wavefront processing methods based on multi-GPU are discussed in detail: single GPU method is used to calculate slope; block-column distribution method is used to fit Zernike coefficient; Zernike polynomial symmetry algorithm and block-row distribution method are used to compute gray map of liquid crystal corrector. Finally, the transfer function of liquid crystal adaptive optics system for matching 4 m telescope is analyzed and magnitude of the residual error transfer function is simulated. The latency of slope calculation is 18 μs, the latency of Zernike coefficient fitting is 39 μs and the latency of computing gray map is 114 μs. The total computing latency is 109 μs and temporal band width in our liquid crystal adaptive optics system is 53 Hz. It is shown that our LCWP based on multi-GPU has the ability to match 4 m astronomy telescope. © 2016, Science Press. All rights reserved.


Zhang L.-C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

Multilayer diffractive grating combines diffractive characters of both grating and multilayer, which leads to the feasibility of optical elements working at normal incidence with high diffractive efficiency and high resolving power. Systematic researches were carried out from the view of practical applications in this paper. Several kinds of key technologies such as the fabrication of high quality grating substrates, the accurate extraction of grating parameters and the deposition method that conserves grating profiles were developed, and diffraction efficiencies of 22.1% and 36.2% were achieved for multilayer laminar grating and multilayer blazed grating respectively.An aperiodic multilayer coating was applied to solve the mismatch problem of bandwidths for multilayer coatings and grating substrates, and a diffraction efficiency about 10% was realized in the region of 13-16 nm. To discuss the feasibility for multilayer gratings to applied on extreme conditions, the heat stability of multilayer coating was investigated.


Zhao W.-C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

The key design of off-axial Three-mirror Anastigmat(TMA) systems was summarized, and an improved design of the off-axial TMA optical systems was proposed with a new optical structure. By taking two designed systems for examples, the optical elements of the TMA system were reasonably arranged, the secondary mirror was designed as a spherical surface, and the primary and the third mirrors were optimized with high-order aspheric coefficients. Obtained results show that the Modulation Transform Function(MTF) curve of the designed system approaches to the optical diffraction limit with an improved value of 0.6 at the spatial frequency of 50 pl/mm. Compared with the common off-axial TMA optical system, the Strehl ratio can be increased from 0.91 to 0.93. The surface tolerance is relaxed from λ/50 to λ/40, and the assembling tolerances of the primary mirror, second mirror and the third mirror can be relaxed by a factor of 4. The improved design makes the manufacture and assembly of the off-axial TMA optical system much easier, and helps the system to achieve excellent performance in the level of optical diffraction limit. These are beneficial to the popularization of off-axial TMA optical systems.


Wang X.-K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

This paper analyzes the drawbacks of current interferogram software with Zernike polynomials in testing a long shape optics. It shows that the Zernike polynomials are no longer orthogonal over a long region and can not show explicit physical meanings. Therefore, it proposes a method to eliminate the misalignment errors of the long shape optics, then establishes a reasonable mathematical model based on the least squares fitting and develops a software for removing errors. The experiment is conducted for a 512 mm×163 mm aspherical mirror by null-compensation and results indicate that the misalignment errors have been eliminated from the original phase distribution exactly, thus the accurate surface map can be obtained. Furthermore, the method also can be used to eliminate the misalignment errors for the optics in regulation, octagon or other shapes.


Liang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

To meet the needs of high performance and microminiaturization of solar irradiance measuring instruments, the key device of absolute radiometer-the micro infrared radiation detection chip, is designed and its theories are analyzed. The bar type diamond with high mechanical performance, high thermal conductivity and high insulation is used for the base of chip. NiP absorbent films that have a high absorptivity in wide spectral range are used to absorb light. The surfaces of nickel-phosphorus black film for infrared absorption have many irregular pores, with the diameters ranging from 50 nm to 10 μm. The reflectivity of NiP films is less than 0.4% at 1.5-16 μm, the transmittance is less than 0.15% at 1.5-16 μm, and the absorptivity is more than 0.99. Thin film resistor is made of constantan which has a good electrical performance. The resistor is prepared by micro-electro-mechanical system (MEMS) technology. The resistance of the thin film resistor is 50.3 kΩ and does not change with temperature, which can meet the requirement of the chip.


Ma J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

The parallel between the optical systems is always aligned in outdoor calibration testing, however, the experimental results are influenced by atmosphere environment, temperature, measuring distance etc. The paper proposes a calibration and testing method to align and calibrate the parallel index of multi-axis optical system of a tracking and collimating system in a laboratory. The coaxality of lasers in the tracking and collimating system, a parallelism test method among lasers, infrared tracking equipment and a laser range finder were studied. The test method for the coaxality and parallelism was designed, and the resetting and the scaling tests were conducted inside and outside the laboratory respectively. The results from measurement and calibration were compared, which shows that the measuring accuracy inside laboratory is better than that outside laboratory. This method satisfies the test requirements.


Zhu W.-B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

A displacement measurement method based on the spectral confocal and optical dispersion characteristics was described and a corresponding displacement measurement system was developed. Compared with the traditional confocal microscope, it has advantages of faster measuring speed, no z axis scanning and direct measurement of the thickness of transparent objects. The work principle of the system was analyzed, and a dispersed objective was designed based on the CODEV macro language and Matlab software. The system shows its work scope in (9.989±0.500) mm, whole measuring range in 1 mm, and designed resolution in 0.6 μm. On the objective plane, the RMS maximum of single wave is 1.3 μm. Combined a collimation system, the spot situation on the pinhole plane for the various wavelengths reflected by the objects was analyzed, which shows that the proper aperture is 3 μm.


Wang X.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

A circuit design method was proposed to compress the space of circuit in a photoelectric encoder and to reduce its size, then the signal processing of the circuit was studied. The basic principle, signal characteristics and signal processing requirements of the photoelectric encoder was introduced and the characteristic of traditional process circuit was analyzed. It points out that the traditional scheme based on amplifiers and comparators is the reason that the circuit structure is larger. To improve the traditional scheme, the methods of A/D through processing and time sharing driving photoelectric signal acquisition were proposed to replace the traditional hardware scheme to compress the space of circuit. The design principle of high integrated circuit of encoder was explained, then a 16-bit smaller encoder with the circuit board area of 415 mm2 and the volume of φ25 mm × 16 mm was designed. Obtained results demonstrate that the circuit design technique for high integrated photoelectric encoders based on SOC single-chip is a better way to compress the circuit space, for it has fewer components, simple circuits and higher integration.


Li Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2013

Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness, strength and thermal dimensional stability, some factors such as support scheme, materials selection, lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge, influences of gravity, assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5°C uniform temperature rise respectively, the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz, which shows an error less than 5% compared to FEA results. © (2013) Trans Tech Publications, Switzerland.


Sun H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

A novel method for Electronic Image Stabilization (EIS) of Bayer color video image sequence was proposed. On the basis of the characteristics of Bayer color image, it converted firstly the Bayer color image into a gray image by using demosaicing and converting RGB into YCbCr. Then, the motion estimation algorithm based on gray scale projection was used to estimate the translation parameter between current frame and reference frame, in which the gray scale projection curves of horizontal and vertical directions of the gray image well reflected the feature of gray distribution in the corresponding direction, and the translation parameters could be obtained via cross correlation function of the gray scale projection curves. In order to resolve the problems of mismatch-color when translation was odd, the motion compensation algorithm based on the bilinear interpolation was applied to compensation of the translation of current frame. Finally, the demosaicing and image stabilization for the Bayer image sequence were performed. The experimental results for video sequences show that the proposed method can implement image detection in a pixel level, and can achieve higher stabilization accuracy with a peek signal to noise ratio of 40 db. It is efficient and suited for the motion estimation and compensation for Bayer color video image sequences.


Wen M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of 2nd International Conference on Computer Science and Network Technology, ICCSNT 2012 | Year: 2012

This paper is concerned with the problem of robust optimization method for coupling parametrization design of space observation system. The objective is to develop an robust optimization framework to design space observation system. An improved robust collaborative optimization (IRCO) method for complex system design using the hybrid optimization algorithm is developed, which associates genetic algorithm (GA) with tabu search (TS). The proposed method can avoid unsolvability or converging difficulty and handle uncertainty within and across disciplines more efficiently and reasonably. The results demonstrate the effectiveness and applicability of the proposed method. © 2012 IEEE.


Qiao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

Key techniques to obtain a sharp image of the long-range target through an opto-electronic tracking system were summarized. To insure the major design parameters of an optical system, the resolution, detection ability and the image plane illumination for the opto-electronic system were analyzed. Based on the effects of atmospheric transmission, optical system and CCD detector, the object-background contrast and the detection ability of a shipborne optic-electronic system were discussed, and the focal length and relative aperture of optical system were reasonably chosen. At last, the detection ability of shipborne optic-electronic equipment was tested on fields based on the developed lens. The results show that the system can meet the demand of the detection range larger than 18 km for flying targets at sea. It provides important testing data and theoretical reference for the design of shipborne opto-electronic system. Meanwhile, the design theory of shipborne optical system is suitable for the designs of vehicle and airborne equipment.


Zhang J.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

The developing status of large aperture ground-based telescopes is reviewed in this paper. The significance of bigger apertures for telescopes and their main technological approaches are expatiated and the summary on appliance values of modern large aperture telescopes is given. Then, it introduces five kinds of modern typical large telescope systems, which represent the topmost technological level. The key structures and technologies of large telescopes about mount, telescope tubes, primary mirror supports and secondary mirror assemblies are disscussed. Finally, it summarizes the developing trends of the large aperture ground-based telescopes and points out that some of the optical systems in the telescopes have been changed from coaxial systems to off-axial systems, while they are better application prospects.


Xu T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

In order to meet the needs of low-cost, high integration space instruments for space power systems, a space-based instrument C8051F040 chip power controller was designed. The major difference between the controller and the traditional design approach is the use of highly integrated lithium-ion battery controller chip (bq77PL900) as an integrated controller chip instead of analog circuits. By employing the bq77PL900, the size of power controller is reduced and the energy of the power controller used is decreased, and the anti-jamming ability of the system is enhanced. To improve the reliability of the system, the system uses the online EEPROM re-injection technology, which can be used to discover the knocked data. This experiment proves that this design not only greatly simple and reliable, but also enhance the efficiency of the system by 5%. This design can wildly used in low-cost space instruments and small satellites. ©, 2014, Chinese Society of Astronautics. All right reserved.


Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

With the development of information technology, space imaging has been developed toward high-definition and multi-channel direction. Real-time video compression system, based on general-purpose DSP and H.264/AVC video coding standard, due to short development cycle, high reliability, high processing speed, ease of upgrades, small size, low power consumption and high adaptability, can provide a solution for the new requirements. Therefore, it is of great importance to study real-time video encoder based on general-purpose DSP and advanced video compression technology. To meet the application needs of more and more high-definition video capture, coding and transmission, TI's new generation multi-core TMS320DM8168 chip was used for development, and the design and implementation of system was proposed, and then the H.264 video encode algorithm was realized for dual 1080p input video. The main processor of the scheme needs only a piece of DSP. Compared with the traditional video compression schemes which need multi processor, this highly integrated scheme reduces the number of parts and materials(BOM)cost, power requirements and the size of PCB, and increases the system integration. ©, 2014, Chinese Society of Astronautics. All right reserved.


Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

The Pulse Per Second (PPS) signal of Global Positioning System (GPS) receiver has large random error and the onboard clock exists cumulative error. Based on analyzing normal distribution characteristics of the PPS signal of GPS, the real-time correction algorithms for reference source of PPS and clock were proposed. In the real-time correction algorithms for reference source of PPS, the average value of pulse number in one second was obtained by averaging high frequency pulse accumulation, the average value of time error was obtained by averaging the pulse number of the time error between predict second pulse and coordinated universal time(UTC), thereby generating corrected second pulse. On the basis of the actual frequency of Temperature Compensated Crastal Oscillato(TCXO) which is obtained by the average method, pulse compensation algorithm was studied which is used for correcting the clock reference source. Simulation and experiment results show that the random error decreases 7.5 times by the use of real-time correction algorithm for reference source of PPS. Test error is less than 140 ns in 9.5 hours by the use of real-time correction algorithm for reference source of clock. The real-time correction algorithm for reference source can effectively reduce the errors based on PPS signal of GPS. ©, 2014, Chinese Society of Astronautics. All right reserved.


Zhang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

The join slurry is composed by silicon carbide (SiC) powder, phenolic resin and carbon black. Joining SiC green body after deairing, and then the reaction bonded SiC(RBSiC) joining mirror blank was prepared by reaction sintering. The relationship of the slurry formula and the microstructure of weld were discussed. The bending strength and the coefficient of thermal expansion of joining RBSiC ceramic were tested. The research shows that PEG200 and PVP can make carbon black dispersing homogeneous in the join slurry, and there is no residual carbon black in the weld after reaction sintering, so the microstructure of RBSiC ceramic is no different from the weld. The blending strength of joining green body and joining RBSiC ceramic are 24.9 MPa and 322.9 MP arespectively, and the fracture occurred in the base material. The ΔCTE of base and weld material is only 0.011 4 ppm during-100-400℃. ©, 2014, Chinese Society of Astronautics. All right reserved.


Tao S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

To resolve the problem that brought by the complex drift angle adjusting structure in the current image motion compensation method, a new drift angle adjusting method based on image was proposed in this paper, which was suitable for the CMOS remote sensing cameras based on TDI in digital domain. The method was based on digital images, and accumulates the matching image pixel in digital domain to adjusts the image motion mismatch caused by the drift angle. Finally, in order to verify the effectiveness of the proposed algorithm, the imaging experiment was conducted. And the results show that when the drift angle is 26.56 degrees, the of the image gotten directly before using the proposed algorithm is 0.132 8, while the contrast transfer function is increased to 0.444 7 after using the proposed method. So it proves that the drift angle adjusting method based on image can improve imaging results significantly and is feasible and effective. The proposed method gets rid of the limit of the idea of adjusting the drift angle by mechanical structure, and it is of high precision but simple, without the need for any additional hardware expenses, which is helpful to improve the current image motion compensation system. ©, 2014, Chinese Society of Astronautics. All right reserved.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

In order to overcome the difficulty of manufacturing off-axis aspheric surface, the key technologies of fabricating and testing SiC aspheric mirror especially for off-axis asphere with abnormal shape were studied. The off-axis SiC aspheric surface was grinded and polished by DMG, FSGJ-2 numerical control machine and IBF, the contour and optical parameters were measured and controlled by the coordinate measuring machine and laser tracker. Finally, an example for fabricating and measuring a similar eight-square off-axis aspheric mirror with the aperture of 600 mm×270 mm was given. For the purpose of testing the aspheric mirror by interferometry, a null lens compensator was specifically designed and developed. As results, the peak-to-valley (PV) and root mean square (RMS) values of the surface error are 0.219 and 0.018 (is 632.8 nm), respectively.


Cao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

In order to study the lightweight issues of the scanning mirror of the UV to near -infrared hyperspectral detector while the mirror was rotating, the topology optimization method based on the constrain of dynamic deformation was proposed. Simplifications were carried out to reduce the calculation complexity of the design constrains. With the topology optimization method, an optimal lightweight form of the scanning mirror was obtained on the condition of rotation. The result shows that the lightweight ratio of the optimized scanning mirror is 47.3%. For the optimized structure, the PV value is 19.36 nm and the RMS value is 5.65 nm, which are improved by 18.45% and 17.41% compared with the initial scanning mirror, respectively. At the same time, the first order frequency of the scanning mirror increases by 113.8 Hz. The results illustrate that the topology optimization method with the constrain of the dynamic deformation of the scanning mirror is reasonable and effective. ©, 2014, Chinese Society of Astronautics. All right reserved.


Li F.,Jilin University | Li C.,Jilin University | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Bai T.,Jilin University | And 4 more authors.
Dalton Transactions | Year: 2013

Monodisperse water-soluble LaF3:Ln3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile and environmentally-friendly microwave-assisted modified polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs can be well dispersed in hydrophilic solutions with small sizes in the range of 9-12 nm. The LaF3:Ln3+ NCs (Ln = Eu, Nd, Ce, Tb, Yb, Er, Yb, Ho and Yb, Tm) have the unique feature of up-down conversion from visible to NIR emission owing to the ladder-like arranged energy levels of Ln3+ and in particular, the high efficiency upconversion of the two-photon, obtained from excitation by a continuous 980 nm laser. This investigation focuses on both the up and down conversion fluorescence properties of water-soluble monodisperse crystalline LaF3:Ln3+ NCs in such a small size. Furthermore, the three-dimensional PDMS rod-like fluorescence displays and a silica surface modification by a core/shell structure on the obtained NCs can improve the biocompatibility, indicating potential applications in optical 3D devices and as bio-probes. This journal is © The Royal Society of Chemistry 2013.


Zheng L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

To solve the non-uniformity response of multiple outputs in TDI CCD imaging systems, every factors that may influence the non-uniformity response were analyzed in detail according to the flow of video signal process. Compared with popular correction methods of non-uniformity response, an improved method based on single point calibration was proposed, which integrated the advance of single-point correction and two-point correction methods. The improved single-point method has the features of simple algorithm, high efficiency, good practical application, low work of measurement, and so on. The results of experiments show that the non-uniformity response of TDI CCD imaging system declines from 3.5% to 1.5% according to the images using the improved method of single point calibration. The maximum of non-uniformity responses among multiple outputs is less than 2.5% during the full response range. The improved method of single-point calibration can satisfy the requirements of TDI CCD image systems and be practical in engineering. ©, 2014, Chinese Society of Astronautics. All right reserved.


Fan H.,Jilin Normal University | Zhao X.,Jilin Normal University | Yang J.,Jilin Normal University | Shan X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Catalysis Communications | Year: 2012

A series of ZnO and graphene composites (ZnO/GRs) was synthesized by a simple and nontoxic hydrothermal reaction route. The TEM, AFM, FTIR, Raman and current-voltage (I-V) results demonstrated that the ZnO particles were coated by the graphene sheets, confirming the formation of ZnO/GRs composites. During the photocatalytic test, in comparison with ZnO and P25, the ZnO/GRs exhibited enhanced photocatalytic performance for degradation of methylene blue (MB) dye since the graphene sheets could prevent the photoinduced hole-electron pairs of ZnO from recombination by transferring the photoinduced electron to the MB. When the mass ratio of ZnO to graphene was 50:1, the ZnO/GR showed the best photocatalytic performance. Moreover the photocorrosion of ZnO was inhibited to a large extent, which could be attributed to the formation of ZnO and graphene composite. © 2012 Elsevier B.V.


Cao Q.,Jilin University | Zuo C.,Jilin University | Li L.,Jilin University | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yan G.,Jilin University
Journal of Polymer Science, Part B: Polymer Physics | Year: 2012

Molecular dynamics simulations were performed for electro-osmotic flow (EOF) confined in a polyelectrolyte-grafted nanochannel under variable grafting density and normal electric field. With decreasing the value of the normal electric field, the brush undergoes a collapse transition, and the ion distribution is changed significantly. The brush thickness increases on increasing the grafting density at positive and weak negative electric fields, whereas a reduced brush thickness is observed at strong negative electric field. Our results further reveal that the flow velocity is not only dependent on conformational transition of the brush but also related to the cation and anion distributions. At low grafting density, the EOF is almost completely quenched at high electric field strength due to strong surface friction between ions and walls. For the case of very dense grafting, the flow velocity is influenced weakly within the brush when varying the grafting density. Additionally, a bidirectional flow occurs at an intermediate electric field. The investigation on fluid flux indicates that the fluid flux is insensitive to the grafting density, when the normal electric field is removed. For nonzero normal electric fields, a significant change in the fluid flux is observed at low grafting densities. © 2012 Wiley Periodicals, Inc.


Cao C.,Jinggangshan University | Qin W.,Jilin University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Nanoscience and Nanotechnology | Year: 2010

20%Yb 3+, 0.5%Tm 3+ co-doped YF 3 and GdF 3 were synthesized through a facile hydrothermal method. After annealing under an argon atmosphere, the sizes and morphologies of the two samples were characterized by field emission scanning electron microscopy, and the phase and crystallization were analyzed by X-ray diffraction. With a 980 nm continuous wave laser diode as the excitation source, blue and ultraviolet upconversion emissions in the wavelength range of 260-510 nm of Tm 3+ and Gd 3+/Tm 3+ ions were recorded. Under the same excitation conditions, the upconversion emission spectra of the two nanocrystals were compared and analyzed. Gd 3+ in the ground state cannot absorb 980 nm photons directly because of the large energy gap between the ground state 8S 7/2 and the first excited state 6P 7/2. In the 20%Yb 3+, 0.5%Tm 3+ co-doped GdF3 nanocrystals, the excited states 6l j of Gd 3+ can be populated through the energy transfer 3P 2 → 3H 6 (Tm 3+): 8S 7/2 → 6l j(Gd 3+), meaning that Yb 3+ acted as primary sensitizers and Tm 3+ acted as secondary sensitizers, transferred energies to host material Gd 3+ and resulted in the ultraviolet upconversion emission of the host ions. In this article, the upconversion luminescent dynamics were studied at the onset of a 980 nm pulsed laser from an optical parametric oscillator pumped by a 10 ns pulsed Nd:YAG laser, too Copyright © 2010 American Scientific Publishers All rights reserved.


Wang K.,Northwestern Polytechnical University | Li X.,Northwestern Polytechnical University | Ma B.,Northwestern Polytechnical University | Wang Y.,Northwestern Polytechnical University | And 2 more authors.
Applied Physics Letters | Year: 2014

The electronic structure of polymer-derived amorphous silicon carbide ceramics was studied by combining measurements of temperature-dependent conductivity and optical absorption. By comparing the experimental results to theoretical models, electronic structure was constructed for a carbon-rich amorphous silicon carbide, which revealed several unique features, such as deep defect energy level, wide band-tail band, and overlap between the band-tail band and defect level. These unique features were discussed in terms of the microstructure of the material and used to explain the electric behavior. © 2014 AIP Publishing LLC.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

For the purpose to test large aspheric surface by Coordinate Measuring Machine (CMM), the new method combined three coordinate measuring and subaperture stitching testing was proposed. The basic principle and flow chart of the method were analyzed, the synthetical optimization stitching mode and effective stitching algorithm were established based on primary aberration and least-squares fitting. A large off-axial SiC aspheric surface with the aperture of 1200 mm×434 mm was tested by this method with 2 subapertures. For the validation, the whole asphere was also measured by profilometry. The PV and RMS between the two methods is 0.073 μm and 0.042 μm, respectively; the PV and RMS of residual error is 0.325 μm and 0.055 μm, respectively. ©, 2014, Chinese Society of Astronautics. All right reserved.


Kong L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

With the development of space technology, satellite thermal control systems face new challenges. First, a detailed comparison of traditional and responsive thermal control systems was presented according to the characters of small speedy responsive space satellites, and then a new design process was derived for responsive thermal control systems. Each of the key technologies including a single hot and cold case design orbits, modular thermal architectures, fast analysis and virtual test method was introduced. Finally, the advanced equipment and materials for responsive thermal control were reviewed. In a word, the author considers that a robust modular scalable thermal control with new advanced smart thermal control device was the certain requirement and way to implement responsive thermal control systems. ©, 2014, Chinese Society of Astronautics. All right reserved.


Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

Aerial camera ground of kinematics simulation device is set up. In order to generate the different distance of visible moving target, screening of the illumination light path and the test method, uniform light source were obtained. Turn the target by a axial moving target with rotating ring, the method Simulated under different camera distance, speed, attitude of terrain target. In the steady speed control system of the target, analyses the goal of steady speed precision, using disturbance observer intervention model, good inhibiting the effects of load disturbance to the steady speed, at the same time, corresponding to the different speed ratio, for the former provides image motion compensations parameters. Through the image interpretation, the dynamic resolution of the camera reaches the expected requirements. The results show that the system structure compact, it can realize the wide range of speed ratio, can provide reliable basic data for different flight imaging. ©, 2014, Science Press. All right reserved.


Wang Z.,Jilin University | Xiao Y.,Jilin University | Cui X.,Jilin University | Cheng P.,Jilin University | And 6 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Urchinlike CuO modified by reduced graphene oxide (rGO) was synthesized by a one-pot microwave-assisted hydrothermal method. The as-prepared composites were characterized using various characterization methods. A humidity sensor based on the CuO/rGO composites was fabricated and tested. The results revealed that the sensor based on the composites showed much higher impedance than pure CuO. Compared with the sensors based on pristine rGO and CuO, the sensor fabricated with the composites exhibited relatively good humidity-sensing performance in terms of response time and response value. The humidity-sensing mechanism was also briefly introduced. The enlargement of the impedance and improvement of the humidity-sensing properties are briefly explained by the Schottky junction theory. © 2014 American Chemical Society.


Su Z.,Jiangnan University | Xue D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ji Z.,Jiangnan University
Optics Express | Year: 2012

We propose a numerical optimization method designing LED array for achieving a good uniform illumination distribution on target plane. Simulated annealing algorithm is employed to optimize LED array arrangement. Using the method, we optimized three LED arrays with various luminous intensity profiles. In order to exhibit the design freedom of the method, we use some LEDs with different intensity value in the first and third array, respectively. By optimizing, the three arrays all produced highly uniform illumination distribution with the uniformity of 0.12, 0.23 and 0.13, respectively. It indicates our method can design various luminous intensity distribution LED arrays and design array consisting of LEDs with different intensity value. In addition, the method is simple and can optimize the LED array automatically by computer program. To the best of our knowledge, it is first time to use numerical optimization method to design the optimal LED array arrangement for uniform irradiance. © 2012 Optical Society of America.


Ding M.,University of Jinan | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yao B.,Jilin University | Li Z.,Western Digital Corporation | Xu X.,University of Jinan
RSC Advances | Year: 2015

High quality ZnO microwires have been fabricated by chemical vapor deposition method. Ultraviolet photodetector based on heterojunction of n-ZnO (individual microwire)/p-GaN film was fabricated. The current-voltage characteristic of the photodetector was investigated, which showed that the heterojunction had rectifying behavior with rectification ratio (Iforward/Ireverse) of about 6.3 × 102 at 4 V. The photoresponse spectrum displayed a sharp cut-off at the wavelength of 380 nm, and the photoresponsivity was as high as 0.45 A W-1 at 0 V and 1.3 A W-1 at 2.5 V reverse bias. The ultraviolet-visible rejection ratio (R370 nm/R450 nm) is three orders of magnitude under zero bias. This journal is © 2015 The Royal Society of Chemistry.


Wang L.,Jiangxi Normal University | Zheng Y.,Jiangxi Normal University | Wang X.,Jiangxi Normal University | Chen S.,Jiangxi Normal University | And 7 more authors.
ACS Applied Materials and Interfaces | Year: 2014

A simple and industrially scalable approach to prepare porous carbon (PC) with high surface areas as well as abundant nitrogen element as anode supporting materials for lithium-ion batteries (LIBs) was developed. Herein, the N-doped PC was prepared by carbonizing crawfish shell, which is a kind of food waste with abundant marine chitin as well as a naturally porous structure. The porous structure can be kept to form the N-doped PC in the pyrolysis process. The N-doped PC-Co3O4 nanocomposites were synthesized by loading Co3O4 on the N-doped PC as anode materials for LIBs. The resulting N-doped PC-Co3O4 nanocomposites release an initial discharge of 1223 mA h g-1 at a current density of 100 mA g-1 and still maintain a high reversible capacity of 1060 mA h g-1 after 100 cycles, which is higher than that of individual N-doped PC or Co3O4. Particularly, the N-doped PC-Co 3O4 nanocomposites can be prepared in a large yield with a low cost because the N-doped PC is derived from abundant natural waste resources, which makes it a promising anode material for LIBs. © 2014 American Chemical Society.


Lu Y.,Changchun University of Science and Technology | Zhao L.,Changchun University of Science and Technology | Zhai P.,Changchun University of Science and Technology | Xia J.,Changchun University of Science and Technology | And 2 more authors.
Optics Letters | Year: 2012

We present a diode-pumped quasi-three-level neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at 885 nm, based on the4F 3/2-4I9/2 transition, generally used for a 946 nm emission. Combined with polarization components (Nd:YAG), the electro-optical crystal KH2PO4 (KDP) formed a Lyot filter in the cavity and compressed the available gain bandwidth. With an incident pump power of 9.2 W, a 714 mW continuous-wave (CW) output at 885 nm was achieved, and the optical-to-optical efficiency was 7.8%. With an adjustable voltage applied to the KDP crystal, the laser wavelength couldbe tuned from 885 nm to 884 nm. A simultaneous dual-wavelength Nd:YAG laser at 885 nm and 884 nm was also realized by adjusting the free spectral range of the Lyot filter. To our knowledge, it is the first study that has realized the tuning between the 884 and 885 nm lines and the simultaneous dual-wavelength CW laser operation at 885 nm and 884 nm. © 2012 Optical Society of America.


Liu C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2014

This paper reports the experimental study of multiphonon relaxation (MR) involving a large energy gap (5 800 cm-1) crossover from bulk to nanocrystal (NC) system. The temperature dependence of MR rate for 5D3→5D4 of Tb3+ in β-NaGdF4: Tb3+ NCs was analyzed in a single-frequency approximation of phonon spectrum in the framework of the nonlinear theory of MR. The experimental data well agree with the theoretical curves within the range of 12 K to 312 K. It is shown that MR occurs predominantly via high-energy optical phonons. In Rayleigh limit, assuming that the Tb3+ emitter was located at the center of a nanosphere, the spontaneous decay rate Γrad was calculated using Green tensor approach. No significant variation in the local density of states (LDOS) was found inside the nanospheres. However, for R<35 nm, a new Gaussian distribution of LDOS was obtained based on Chew's theory outside the nanospheres. ©, 2014, Faguang Xuebao/Chinese Journal of Luminescence. All right reserved.


Zhang C.-Y.,Jilin University | Qin L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang H.-J.,Jilin University
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2014

Red phosphorescent microcavity organic light-emitting device (MOLED) with structure of Glass/DBR /ITO /MoO3(1 nm)/TcTa(55 nm)/CBP: Ir(piq)2acac(44 nm, 6%)/TPBI(55 nm)/LiF(1 nm)/Al(80 nm) was fabricated. For comparison, an OLED without cavity also was fabricated. The effect of microcavity structure on luminescent properties of phosphorescent devices was studied. The electroluminescence (EL) spectrum peak of OLED is at 626 nm, and the full width at half maximum (FWHM) is 92 nm. The electroluminescence (EL) spectrum peak of MOLED is at 628 nm, and the FWHM is 42 nm which is narrowed half compared with the 92 nm value. The micro cavity structure can narrow the luminescence spectrum of OLED and improve the colour purity. For MOLED, the maximum brightness, the maximum current efficiency, the maximum external quantum efficiency (EQE) are 121 000 cd/m2, 27.8 cd/A and 28.4%, respectively. For OLED, its maximum brightness, current efficiency and external quantum efficiency are 54 500 cd/m2, 13.1 cd/A and 16.6%, respectively. Comparing with the no cavity device, the luminescence properties of microcavity device have been improved greatly. ©, 2014, Faguang Xuebao/Chinese Journal of Luminescence. All right reserved.


Xuan B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2015

The relative wavefront gradient deviation evaluation methods were proposed to evaluate wavefront errors of imaging systems for characterizing directly the imaging performance of the wavefront. The wavefront gradient deviation was defined as the deviation between each image point and image energy center and the relative wavefront gradient deviation was defined as the ratio of gradient deviation to Airy disk radius. Then, the relative wavefront gradient deviation evaluation methods were given. As the relative wavefront gradient deviation is independent on wavefront dimension, wavefront shape and focal length, the relative wavefront gradient deviation was evaluated by image size, image concentration and image energy distribution in this paper. The evaluations of image concentration and image energy distribution are usually stable enough for different test resolutions. The differences for every double or half resolution differences are usually less than 10%. According to the relative wavefront gradient deviation distribution on an exit pupil and wavefront gradient distribution on an image plane, it can be convenient to operate for optical manufacture and system assembling. The experiments show that the relative wavefront gradient deviation evaluations can be used as the wavefront specifications for quality control. © 2015, Science Press. All right reserved.


Cao C.,Jinggangshan University | Qin W.,Jilin University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Communications | Year: 2010

The Yb3+/Tm3+ co-doped GdF3 and NaGdF4 samples were synthesized through a combination method of a co-precipitation and an argon atmosphere annealing procedures. X-ray diffraction analysis indicated that the Yb3+/Tm3+ co-doped GdF3 sample crystallized well and was orthorhombic phase, and the Yb3+/Tm3+ co-doped NaGdF4 sample was hexagonal phase. With a 980-nm semiconductor continuous wave laser diode as the excitation source, the up-conversion emission spectra of the two samples in the wavelength range of 240-510 nm were recorded. In the up-conversion emissions of the samples, Yb3+ transferred energies to Tm3+ resulting in their ultraviolet, violet, and blue up-conversion emissions. And, Tm3+ simultaneously transferred energies to Gd3+, which finally resulted in ultraviolet up-conversion emissions of Gd3+. The study on the excitation power dependence of up-conversion fluorescence intensity indicated that there were multi-photon (three-, four-, five-, and six-) processes in the up-conversion emissions of the samples. And the up-conversion emissions of Gd3+ and Tm3+ in the Yb3+/Tm3+ co-doped GdF3 and NaGdF4 samples were compared studied, too. © 2009 Elsevier B.V. All rights reserved.


Ge M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

In order to improve the detection performance of the laser active anti-surveillance system for micro-target, based on the “cat's-eye” effect of optical system, describe the principle of work. The model of operation range is established according to the “cat's-eye” target parameter. By numerical simulation with MATLAB, the relationship curves of the operation range with the laser power, diverging angle, sensitivity of CCD and the aperture of “cat's-eye” target. The results show that, if the laser incidence angle to the “cat's-eye” target is two degrees, to detect the target diameter less than 1 millimeter within 5 meter, requires about 1 watt output power of a laser. The power and the detection distance are inversely proportional to the size of incidence angle, proportional to the target diameter size. The performance of the laser active detection system is closely related with “cat's-eye” target parameter. This study has important implications for improving detection and recognition performance. ©, 2014, Science Press. All right reserved.


Wang Y.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-J.,Nanjing Institute of Technology
Chinese Optics | Year: 2014

In order to improve the consistency of the assessment result of image fusion with that of Human Visual System, the state-of-the-art image fusion assessment methods are deeply analysed, then a new assessment method is proposed in this paper, which is based on the complex number expression for image structure. The gradient information of luminance layer of color image is used to perform the task. When it is used to describe image structure, more human visual system-sensitive information are contain in the corresponding complex matrix. Due to the calculation problem of mutual information, we perform singular value decomposition on the complex matrix, and the singular value vector of each image block is used to construct the new matrix. Results from experiments show that the proposed method gives evaluation of 3.7485 and 3.7222 for pyramid and DWT methods. It improves the consistency of assessment results with those of human visual system.


Wu J.F.,Control Iron and Steel Research Institute, China | Chen Y.Y.,Control Iron and Steel Research Institute, China | Wang T.S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2012

In order to deal with the conflicts between broad spectral region and high resolution in compact spectrometers based on a flat field concave holographic grating and line array CCD, we present a simple and practical method to design a flat field concave holographic grating that is capable of imaging a broad spectral region at a moderately high resolution. First, we discuss the principle of realizing a broad spectral region and moderately high resolution. Second, we provide the practical method to realize our ideas, in which Namioka grating theory, a genetic algorithm, and ZEMAX are used to reach this purpose. Finally, a near-normal-incidence example modeled in ZEMAX is shown to verify our ideas. The results show that our work probably has a general applicability in compact spectrometers with a broad spectral region and moderately high resolution. © 2012 Optical Society of America.


Song S.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

A kind of manufacturing and testing method for rectangular off-axis aspheric lightweight mirror is introduced. In order to overcome the corner effect, double-swing polishing(DSP) method is proposed. A DSP machine is made to achieve satisfying manufacturing result. The DSP and the 4-pole method are successfully applied for manufacturing optical system in the spectrometer. Four rectangular off-axis aspheric mirrors with the largest size of 266 mm×110 mm are polished, and the final surface precision figures are better than 0.020λ(RMS, @633 nm). Manufacturing result shows that the double-swing polishing method improves the polishing efficiency and reduces the optical surface medium frequency error. ©, 2014, Editorial Office of Chinese Optics. All right reserved.


Zhang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

In order to polish optical flat mirror with nanometer surface error efficiently, a consisting of new polishing technology traditional continuous polishing(CP) and advanced ion beam figuring(IBF) is presented in this paper. The polishing principles of CP and IBF are introduced. The polishing experiment and material removal function of IBF are studied. A Ф150 mm optical flat mirror is polished by the combined polishing technology. After polishing, the surface error and roughness of the flat mirror are 1.217 nm RMS and 0.506 nm RMS, respectively. The experiment results indicate that the combined polishing technology is effective for polishing optical flat mirror with nanometer surface error.


Li Z.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2014

The experimental setup was constructed with a 300 W high stability Xenon lamp, fore condenser lens, concave grating flat-field monochromator, programmable digital micromirror device (DMD), post condenser lens and integrating sphere. The test experiments of light source spectral radiances were carried out and the measurement results of spectral radiances of light source in broad-band and narrow-band modes were obtained. The developed experimental unit of spectrally tunable light source can produce optical radiation with different spectral distributions as needed by programmable manipulations, and the operability of programmatically changing spectral distributions of light source was indicated.


Jirigalantu,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

The stress distribution on gating ruling tool edge is analyzed by finite element analysis software DEFORM. Combined with the diamond crystal cleavage theory, the wear resistant edge orientation of tool is designed. As the max friction direction on tool tip is parallel with periodic bond chain of diamond crystal and the load in Z direction is vertical to (111) crystal plane, the angle between the blaze plane of tool and (111) crystal plane is 27° and the angle between non-blaze plane of tool and (111) crystal plane is 63°. The ruling distance is more than 17 km under the tool load of 72 g, and no defects occur on tool edge such as collapse, etc. The life of grating ruling tool designed by this method far exceeds that of traditional ruling tool (ruling distance is about 0.8 km), which illustrates that the wear resistant design method of grating ruling tool for echelle is feasible and effective.


Gao Z.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

When assembling CCD of hyperspectral imager, 20 μm focal depth should be satisfied in longitudinal direction, and alignment in spectral and spacial direction should also be achieved. An equivalent focal plane assembling module is designed to avoid frequent installation of expensive CCD during measurements. The equivalent module is precisely manufactured according to measured dimensions of CCD module. It also provides simulated spectral image that could be observed by microscope. By measuring distance between real and simulated spectral image, spacer's reshape value is calculated, and spectral image is aligned to CCD laterally. Experiment shows that the whole spectral image's defocusing value is in focal depth in the presence of tool microscope measuring error, spacer reparation error and interchangeability error. MTF is higher than 0.3 after 3 iterations in experiment, which shows an improvement on efficiency and safety.


Liu C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

La1.6(MoO4)3: Eu0.4 3+ nancrystal is synthesized by combustion method and the interaction between the phonon-dopant-lattice and luminescence properties of this nanocrystal are investigated. It is shown by X-ray diffraction that the powders are crystallized in a single phase annealed at 500~900 ℃. It is found that the excitation of the Mo6+-O2- charge transfer band(CTB) can result in the emissions of Eu3+ ion, which indicates that energy transfer takes place from CTB to Eu3+ ions. Two one-phonon sidebands locate at λ1=469 nm and λ2=426 nm in the excitation spectra which are due to Mo=O and Mo-O-Mo expand and contract vibration modes, respectively, with phonon energies of 1 202 cm-1 and 767 cm-1. The Huang-Kun factors S1=0.055 and S2=0.037 describing the interaction intensity between phonon and lattice are determined. The optical properties of La1.6(MoO4)3: Eu0.4 3+ would be able to provide the experimental foundation to reveal the properties of high conductivity and negative thermal expansion(NTE) with the trivalent ions. ©, 2014, Editorial Office of Chinese Optics. All right reserved.


Duan H.,Northeast Normal University | Zhao W.,Northeast Normal University | Wang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang G.,University of Chinese Academy of Sciences | Feng X.,Yili Normal University
Mathematical Problems in Engineering | Year: 2012

Due to the shortcomings in the traditional methods which dissatisfy the examination requirements in composing test sheet, a new method based on tabu search (TS) and biogeography-based optimization (BBO) is proposed. Firstly, according to the requirements of the test-sheet composition such as the total score, test time, chapter score, knowledge point score, question type score, cognitive level score, difficulty degree, and discrimination degree, a multi constrained multiobjective model of test-sheet composition is constructed. Secondly, analytic hierarchy process (AHP) is used to work out the weights of all the test objectives, and then the multiobjective model is turned into the single objective model by the linear weighted sum. Finally, an improved biogeography-based optimization-TS/BBO is proposed to solve test-sheet composition problem. To prove the performance of TS/BBO, TS/BBO is compared with BBO and other population-based optimization methods such as ACO, DE, ES, GA, PBIL, PSO, and SGA. The experiment illustrates that the proposed approach can effectively improve composition speed and success rate. © 2012 Hong Duan et al.


Fei W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Geiger-mode detectors have single photon sensitivity and picoseconds timing resolution, which make it a good candidate for low light level ranging applications, especially in the case of flash three dimensional imaging applications where the received laser power is extremely limited. Another advantage of Geiger-mode APD is their capability of large output current which can drive CMOS timing circuit directly, which means that larger format focal plane arrays can be easily fabricated using the mature CMOS technology. However Geiger-mode detector based FPAs can only measure the range information of a scene but not the reflectivity. Reflectivity is a major characteristic which can help target classification and identification. According to Poisson statistic nature, detection probability is tightly connected to the incident number of photon. Employing this relation, a signal intensity estimation method based on probability inversion is proposed. Instead of measuring intensity directly, several detections are conducted, then the detection probability is obtained and the intensity is estimated using this method. The relation between the estimator's accuracy, measuring range and number of detections are discussed based on statistical theory. Finally Monte-Carlo simulation is conducted to verify the correctness of this theory. Using 100 times of detection, signal intensity equal to 4.6 photons per detection can be measured using this method. With slight modification of measuring strategy, intensity information can be obtained using current Geiger-mode detector based FPAs, which can enrich the information acquired and broaden the application field of current technology. © 2013 SPIE.


Zhang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Phase diversity speckle (PDS) is an image restoration technique which is based on the idea of phase diversity (PD). It uses multi-frame short-exposure image sequence to calculate their corresponding wave-front information. Each image pair consists of two images collected by two cameras at the same time with one in focus and the other with known defocus value. Multi-frame processing can significantly improve the target signal to noise ratio (SNR), and decrease noise influence. In this paper, based on the principle of pupil Fourier imaging, by adjusting the pupil size, we get different scales of the optical point spread function (PSF). Also, we analysis different camera noise distribution channels, location differences and other factors to improve the processing speed of image restoration. In the indoor environment, we build optical platform, and use multi-frame phase diversity speckle to make experiment under different turbulence conditions. The experimental results show that with the camera size of 128×128 pixels, the image restoration effect is close to the diffraction limit. © 2013 SPIE.


Ren H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2011

Based on analysing the timing of the image motion compensation of full frame focal plane CCD camera, and using FPGA as the timing device, the design method of the driving system was given. Taking such CCD chip FTF4052M as the subject, software simulations on the timing circuit and tests on the hardware circuit were made, and the compensation result was verified in practical CCD imaging.


Wang J.L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2014

In order to superpolish fused silica surface, a non-contact polishing method is applied, which is called as computer numerical-controlled (CNC) micro-jet polishing (MJP) technology developed on the base of the hydrodynamic mechanism. In this paper, both the theory and the techniques about this new polishing technology are introduced in detail, and the curved surface of fused silica was polished. The results demonstrate that no new scratches were produced when the nanoparticles removed the atoms away from the surface. The roughness decreased monotonously with the removal of subsurface damage layer. And ideal Ultrasmooth surface without scratches was achieved by MJP with waveness less than 0.2nmrmsRMS while the high-spatial frequency roughness less than 0.1nmrmsRMS (sub-angstrom). © (2014) Trans Tech Publications, Switzerland.


Fan G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings - 3rd International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2013 | Year: 2013

This paper discussed the discrete-time linear switching systems whose discrete mode transitions are caused by discrete disturbance events and have continuous state reset functions, in the presence of parameter uncertainty, state and control input bounds, the problem of robust stabilizing controller design is researched, and a method of static state feedback stabilizing controller is proposed. The relation between robust stability and existence of a robust controlled invariant set is constructed, and a test condition which can achieve in finite number steps is given. Based on the robust stability condition and the notation of linear un-saturation region for control input, the proposed robust stabilizing controller can be obtained by solving of a finite number of inequalities. At last, a numerical example is given to show the validity of the method. © 2013 IEEE.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2012

The issue of the letter is focused on the RB-SiC aspherical mirror high frequency surface quality which is fabricated with the different type fixed abrasive pellets. The two-dimensional (2D) surface roughness of the mirror is simulated and experimented. The errors between the simulation and the experiment are 5.97%, 3.19%, 3.59%, 37.37% using W1.5, W3.5, W5, W7 pellets respectively. The error emerging reason is analyzed in detail after the comparison. Also the fractal theory is applied on the analysis of the optical mirror surface fabricated with the fixed abrasive technology. The analysis result shows that the good surface quality of the RB-SiC mirror can be obtained quickly with being polished with the fixed abrasive technology. So the fixed abrasive technology is very suitable for the fast optical surfacing, especially can obtain good surface roughness fast in the stage of grinding mirror which is not suitable for being tested with interferometer. © 2012 Chinese Optics Letters.


Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

For the special use demands of ultraviolet warning cameras, the structures, distortion balances and the consistency of image plane illumination of ultra wide-angle optical systems were analyzed. An ultraviolet optical system with a large field of view of 120° and a large relative aperture of 1/2 was designed. The system is a double imaging configuration with the spectral range from 0.254 m to 0.272 m. By using inverse telephoto structure, its back working length is 7.48 mm. A quasi-telecentric optical system was selected to improve the illumination uniformity for off-axis and on-axis view fields. Then, by choosing optical materials and distributing the focal powers reasonably, the optical system was optimized. The experiments demonstrate that the system is characterized by smaller imaging distortion and uniform image plane illumination, the dispersion spot diameter is smaller than 63.5 m, and the relative distortion at 0.71 field of view, the relative illumination uniformity for off-axis and on-axis view fields are less than 20% and 10%, respectively. The structure of the whole system is compact and feasible, and is suitable for ultraviolet warning cameras. ©, 2014, Chinese Academy of Sciences. All right reserved.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2012

For the purpose to test large and off-axis aspheric surfaces without the aid of other null optics, a novel method combined subaperture stitching and interferometry is introduced. The basic principle and theory of the technique are researched, the synthetical optimization stitching mode and effective stitching algorithm are established based on homogeneous coordinates transformation and simultaneous least-squares fitting. The software of SSI is devised, and the prototype for testing of large aspheres by SSI is designed and developed. The experiment is carried on with three subapertures for an off-axis sic aspheric mirror with a clear aperture of 230×141 (mm). For the compare and validation, the asphere is also tested by null compensation, the synthesized surface map is consistent to the entire surface map from the null test, the differences of PV and RMS error are 0.023λ and 0.014λ, respectively; and the relative errors of PV and RMS are 0.57% and 2.74%, respectively .The results conclude that this technique is feasible and accurate. It enables the non-null testing of parts with greater asphericity and larger aperture.


Shen Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2012

SiC coating for surface modification grows on reaction boned SiC (RB-SiC) substrate cannot have high quality because the material of RB-SiC has two phases. We apply a new method to improve the effect of surface modification. First the surface of RB-SiC is carbonized, and then a diamond like carbon (DLC) coating is prepared on it before the growth of SiC coating. Research and tests show that the SiC coating can grow denser and uniform because of the buffer function of the DLC coating, thus the effect of surface modification is improved. The roughness reduces from 1.397 to 0.478 nm (rms) after the surface modification using DLC buffer layer. © 2012 Chinese Optics Letter.


Zhu M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

To meet the demand for stars detection by all-time optical measure equipment in the ship, and remove the problem of observable stars in the daytime by TV measurement as well as keep inertial navigation equipment emending its direction continuously, so that Space Tracking, Telemetering and Commanding ships "YUAN WANG" can realize their sophisticated measuring and tracking, the technique of "real-time variable multi-levels spectrum filtering", which can distinguish dark and small star target from the bright background of the sky, "the algorithm of dark and small target's stable recognition", which realizes quick and stable targets recognition and tracking, and "the methods in software radio design", which realizes the composition of the processing system and the application of the algorithm are adopted. The optical measure equipment can detect the stars of magnitude 4.5 or even bigger, and the amount of stars that can be detected in the daytime can reach 250 or more, based on that optical equipment's aperture equals 180 mm and its focal length equals 3000 mm. The ability of maximum grades of star detection in the daytime can reach the grades in night, which expandes working ability of the optical equipment that now uses in ships to its limitation. The method can be popularized and applied in many other fields of dark and small targets detection by TV.


Wang X.,Jilin University | Yuan K.,Jilin University | Yu X.,PLA Air Force Aviation University | Zhang M.-C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

An 3D reconstruction system based on binocular stereo vision was improved to obtain higher accuracy and larger scale of 3D reconstruction. A disparity refinement procedure was introduced to the system, so that the matching cost between the original parallax and the adjacent disparity was fitted into a quadratic curve and to re-find a more accurate parallax for the curve. Then, the motion recovery calculation was further applies to estimation of the camera motion matrices and the tracking points and camera motion matrices were taken as the parameters to construct the energy function. Furthermore, the energy function was optimized to reduce errors effectively and reconstruct the motion matrix accurately. Experimental results indicate that the proposed refinement procedure effectively improves the accuracy of reconstruction of point clouds and reduces the error by 16.3 percent in average with avoiding the scale point cloud phenomenon. As the motion recovery calculation steps recover the camera motion matrix accurately, the optimized method reduces the mean re-projection error by 95.5 percent. The point clouds achieved from different angle images are no longer isolated and the reconstructed models are integrated naturally.


Liang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

In order to improve the accuracy of the optical-fiber dimension transform element (OFDTE) which is used in spatial exploration, imaging system, iatrology and military reconnaissance, the plane arranging method of fiber array based on silicon V-grooves is established. Firstly, the system error of the OFDTE is analyzed. Then, experiments are performed on arranging fibers, solidifying glue, polishing end surface and packaging device. Finally, a 1×2 OFDTE containing 2000 optical fibers is fabricated. The measurement results indicate that the maximum error accumulated in 2000 periods of the silicon V-grooves is 0.5 μ m, and the error of the height in Si-V grooves is less than 0.15 μ m. The value of root mean square of roughness of the end face is less than 0.9 nm. Furthermore, the position error of the end surface in 2000 periods is 190.5 nm. The transmittance of the OFDTE without optical film is 51.46% at the wavelength of 632.8 nm. After random vibration experiment, the ratio of the broken fiber increases by 0.1%. The characteristics of device keep stable when environmental temperature is changed within -40°C to 40°C.


Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2012

A convex aspheric surface using a computer-generated hologram (CGH) test plate fabricated with novel techniques and equipment is tested. However, the measurement result is not verified via comparison with other methods. To verify the accuracy of the measurement, a perfect sphere surface is measured by the following. The measurement result is quantified into four parts: the figure error from the tested spherical surface; the figure error from the reference spherical surface; the error from the hologram; and the adjustment error from misalignment. The measurement result, removed from the later three errors, shows agreement to 4-nm RMS with the test by Zygo interfermeter of the same surface. Analysis of the CGH test showed the overall accuracy of the 4-nm RMS, with 3.9 nm from the test plate figure, 0.5 nm from the hologram, and 0.74 nm from other sources, such as random vibration, various second order effects, and so on. Thus, the measurement accuracy using the proposed CGH could be very high. CGH can therefore be used to measure aspheric surfaces accurately. © 2012 Chinese Optics Letters.


Chen X.,University of Missouri - Kansas City | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Huang F.,CAS Beijing National Laboratory for Molecular | Huang F.,CAS Shanghai Institute of Ceramics
Chemical Society Reviews | Year: 2015

In the past few decades, there has been a wide research interest in titanium dioxide (TiO2) nanomaterials due to their applications in photocatalytic hydrogen generation and environmental pollution removal. Improving the optical absorption properties of TiO2 nanomaterials has been successfully demonstrated to enhance their photocatalytic activities, especially in the report of black TiO2 nanoparticles. The recent progress in the investigation of black TiO2 nanomaterials has been reviewed here, and special emphasis has been given on their fabrication methods along with their various chemical/physical properties and applications. This journal is © The Royal Society of Chemistry.


Huang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2012

We present an optical design for a fingerprint scanner that addresses the challenges involved in capturing the prints of rolling fingers. A rolling fingerprint scanner requires a high performance distortion free system with big object space numerical aperture (0.022) and larger capture size (40×40 (mm)). We show how these requirements can be achieved with the approach of optical and computational hybrid distortion correction. In addition, dark background illumination is utilized to increase fingerprint contrast. © 2012 Chinese Optics Letters.


Zhu Y.,Jilin University | Sun Z.,Jilin University | Yin Z.,Jilin University | Song H.,Jilin University | And 4 more authors.
Dalton Transactions | Year: 2013

The modification of photonic crystals (PCs) on photoluminescence of rare earth (RE) ions has attracted considerable interest, however, the modification of PCs on energy transfer (ET) processes of two separate RE centers has not been investigated yet. In this paper, three-dimensional Ce3+, Tb 3+-codoped LaPO4 inverse opal PCs (IOPCs) were fabricated by the PMMA colloidal template method. The modification of the photonic stop band (PSB) on emission spectra and the dynamics of the 5d-4f transition of Ce3+ and the 4f-4f transition of Tb3+ ions were systematically studied. It is interesting to observe that the spontaneous decay rates (SDR) of 5D4-7F5 in the IOPCs were suppressed as highly as 173% in contrast to the reference ground powder samples (REF) due to the modification of the effective refractive index (n eff). The energy transfer (ET) rate of Ce3+ to Tb 3+ did not change in the IOPCs, however, the energy migration rate among Tb3+ ions was largely restrained. It is also significant to observe that, in the IOPCs, the temperature quenching and radiation trapping of photoluminescence were greatly suppressed due to the periodic empty cavity structure of IOPCs, which is significant for high-power light sources and laser devices. © 2013 The Royal Society of Chemistry.


Zhang C.,Jilin University | Guo S.,Jilin University | Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan J.,Jilin University | Gao F.,Jilin University
Optics Express | Year: 2014

We propose a novel method for object reconstruction of ghost imaging based on Pseudo-Inverse, where the original objects are reconstructed by computing the pseudo-inverse of the matrix constituted by the row vectors of each speckle field. We conduct reconstructions for binary images and gray-scale images. With equal number of measurements, our method presents a satisfying performance on enhancing Peak Signal to Noise Ratio (PSNR) and reducing computing time. Being compared with the other existing methods, its PSNR distinctly exceeds that of the traditional Ghost Imaging (GI) and Differential Ghost Imaging (DGI). In comparison with the Compressive-sensing Ghost Imaging (CGI), the computing time is substantially shortened, and in regard to PSNR our method exceeds CGI on grayscale images and performs as well as CGI visually on binary images. The influence of both the detection noise and the accuracy of measurement matrix on PSNR are also presented. © 2014 Optical Society of America.


Huang H.,Jilin University | Yang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ma S.,Jilin University
Journal of Electronic Imaging | Year: 2013

Image restoration and deconvolution from blurry and noisy observation is known to be ill-posed. To stabilize the recovery, total variation (TV) regularization is often utilized for its beneficial edge in preserving the image's property. We take a different approach of TV regularization for image restoration. We first recover horizontal and vertical differences of images individually through some successful deconvolution algorithms. We restore horizontal and vertical difference images separately so that each is more sparse or compressible than the corresponding original image with a TV measure. Then we develop a novel deconvolution method that recovers the horizontal and vertical gradients, respectively, and then estimate the original image from these gradients. Various experiments that compare the effectiveness of the proposed method against the traditional TV methods are presented. Experimental results are provided to show the improved performance of our method for deconvolution problems. © 2013 SPIE and IS and T.


Zhu J.-Z.,Yanshan University | Li W.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2012

High efficiency white organic light-emitting diodes (WOLEDs) with high color rendering index (CRI) was fabricated. The white light was composed by the blue emission of 9, 10-di(2-naphthyl) anthracene and the enhanced green and red emissions of tris-(8-hydroxyquinolinato) aluminum and 4-(dicyanomethylene)-2-t-butyl-6- (1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran, respectively. The WOLED shows the Commission Internationale de l'Eclairage-1931 coordinates vary from (0.3432, 0.3397) to (0.3243, 0.3218), the correlated color temperature varies from 5035 K to 5915 K and all the CRIs exceed 90 when the driving voltage changes from 8 V to 12 V. A maximum brightness of 27853 cd/m 2 at 14 V and a peak current efficiency of 9.58 cd/A at 7.5 V are attained, respectively. The electroluminescent (EL) spectrum is tuned by changing the thickness of the green and red emission layers. The efficiency enhancement is realised by sensitising the green and red light emissions. The maximum efficiency is increased by 73.6% compared to the control device.


Yang J.,Jilin Normal University | Zhao X.,Jilin Normal University | Shan X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fan H.,Jilin Normal University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2013

ZnO and graphene composites (ZnO/GR) were prepared by a simple and repeatable thermal evaporation process, and both the reduction of graphene oxide and the loading of ZnO were achieved. The structural and optical properties were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) measurements. In the PL spectra, when the mass ratio of graphene to ZnO increased, a series of fluorescence quenching were found, and a regularly blue shift of the ultraviolet (UV) peak were also found, which might be attributed to the Burstein-Moss effect. © 2012 Elsevier B.V. All rights reserved.


Zheng N.,Chinese Academy of Sciences | Liu J.,Chinese Academy of Sciences | Wang Q.,Chinese Academy of Sciences | Liang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Geochemistry | Year: 2011

Zinc smelting and chlor-alkali production are major sources of Hg contamination to the environment, potentially leading to serious impacts on the health of the local population. Huludao, NE China has been heavily contaminated by Hg due to long-term Zn smelting and chlor-alkali production. The aim of this work was to determine Hg accumulation in the aquatic and terrestrial environment, as well as in the human population of Huludao. The investigation included: (a) Hg accumulation in sediments, Spirogyra algae, crucian carp and shrimp, (b) Hg distribution in soil, vegetables and corn, and (c) assessment of potential health effects of Hg exposure associated with total Hg (T-Hg) concentrations in human hair. Measured T-Hg concentrations in sediments of Wuli River ranged from 0.15 to 15.4mgkg-1, with the maximum Hg concentration in sediment exceeding the background levels in Liaoning Province by 438 times. The maximum T-Hg levels in Spirogyra, crucian carp and shrimp were 13.6, 0.36, and 0.44mgkg-1, respectively. Total-Hg concentrations in hair of the human population varied from 0.05 to 3.25mgkg-1 (average 0.43mgkg-1). However, the frequency of paraesthesia to most inhabitants in Huludao was estimated to be lower than 5%, with only one person rated at 50%. The results indicated minimal adverse health effects of Hg exposure to the inhabitants of Huludao, despite the serious Hg contamination of the environment. © 2010 Elsevier Ltd.


Zhu H.,Hong Kong Polytechnic University | Yu S.F.,Hong Kong Polytechnic University | Wang Q.J.,Nanyang Technological University | Shan C.X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Su S.C.,South China Normal University
Optics Letters | Year: 2013

Ring microcavities were formed by wrapping ZnS microbelts, which act as the waveguide and gain region of the microcavities on the surface of optical fibers. The ring microcavities with the formation of whispering gallery modes have lasing threshold lower (Q-factor higher) than that of the ZnS microbelts. The excitation of TM modes could also be suppressed by the ring geometries of ZnS microbelts. Furthermore, directional single-mode lasing was realized from a coupled asymmetric ring microcavity. The Vernier coupling effect and deformed geometry of the asymmetric ring microcavity were contributed to the stable single-mode operation and directional emission, respectively. © 2013 Optical Society of America.


Liu C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The varisized samples (4.7~115.5 nm) of β-NaGdF4:1%Tb3+, 1%Er3+ nanocrystals (NCs) were synthesized by hydrothermal method using Span 80 as template. In Rayleigh limit (the size of the particle is comparability with the wavelength of the transition), the influences of the NCs sizes on local density of states (LDOS), radiation and nonradiation of Tb3+- Er3+ spectral pairs embedded in β-NaGdF4 nanospheres were investigated, to reveal the physical mechanics of DC process further. Based on the Tb3+- Er3+ spectral pair located at the center of a dielectric β-NaGdF4 nanosphere model, the spontaneous decay rate of Tb3+-Er3+ emitter, as a probe of the LDOS, was calculated with the Green tensor approach. There is no significant variation of LDOS inside the nanospheres. For the small size (R≪λ) of NCs, a new Gauss's distribution-like of the LDOS was obtained by Chew's theory, for R>35 nm (in our case) the descent side of the Gauss-like distribution of the LDOS was obtained. The LDOS is directly proportional to local field E2, thus the Gauss-like distribution of the LDOS can be attributed to the strong interaction between the small emitter and the local field. By calculating the ratio of spontaneous radiative rate of bulk medium and the size of NCs, the filling factors can be determined directly.


Xiao X.,Northeast Normal University | Shao K.,Northeast Normal University | Yan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Mei Z.,Baicheng Normal College | And 2 more authors.
Dalton Transactions | Year: 2013

A novel macrocyclic organotin(iv) carboxylate {[n-Bu2Sn(O)] 9(CH2CH3)2L}·3CH 2CH3OH (complex 1) (L = (9-carboxymethyl-1,3,8,10- tetraoxo-3,8,9,10-tetrahydro-1H-anthra[2,1,9-def;6,5,10- d′e′f′]diisoquinolin-2-yl)-acetic acid) was generated by the reaction of dibutyltin oxide with amide dicarboxylic acid L and characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy. X-ray crystallography diffraction analysis reveals that 1 is a centrosymmetric macrocycle and contains a nona-nuclear eight-fold-ladder-like organo-oxotin cluster. The preliminary luminescent properties of complex 1 have also been studied. © 2013 The Royal Society of Chemistry.


Tan H.,CAS Changchun Institute of Applied Chemistry | Tan H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Du S.,CAS Changchun Institute of Applied Chemistry | Bi Y.,CAS Changchun Institute of Applied Chemistry | Liao W.,CAS Changchun Institute of Applied Chemistry
Chemical Communications | Year: 2013

Two 2D metal-calixarene aggregates were designed and assembled by M 4-TC4A (M = Fe, Co; TC4A = p-tert- butylthiacalix[4]arene) SBUs and {MCl2} units with isonicotinic acid molecules, which presents a possible way to build the extended metal-calixarene assemblies incorporating pre-designed nanocages using multifunctional linkers. © 2013 The Royal Society of Chemistry.


Zhang J.,Jilin University | Wang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang G.,University of Chinese Academy of Sciences
Applied Mechanics and Materials | Year: 2012

Due to shortcoming of traditional image matching for computing the fitness for every pixel in the searching space, a new bat algorithm with mutation (BAM) is proposed to solve image matching problem, and a modification is applied to mutate between bats during the process of the new solutions updating. This new approach can accelerate the global convergence speed while preserving the strong robustness of the basic BA. The realization procedure for this improved meta-heuristic approach BAM is also presented. To prove the performance of this proposed meta-heuristic method, BAM is compared with BA and other population-based optimization methods, DE and SGA. The experiment shows that the proposed approach is more effective and feasible in image matching than the other model. © (2012) Trans Tech Publications, Switzerland.


Song Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Key Engineering Materials | Year: 2013

The programmable coded aperture has been applied to the optical systems to enhance their functionality and performance. Therefore, the optical system is programmable. It means that the optical system could be changed momentarily. Conventionally, during MTF measurement, the optical system is fixed. The system under test and the test equipment have no relation of time sequence. The image sensor sample of test equipment can be random. But In the programmable optical system, the aperture style and its duration in a frame period have a impact on the system MTF. Conventional MTF measurement methods can't be used to test accurately the MTF of programmable optical system. In this paper, we propose a method and design a system which can test precisely MTF of the programmable optical system. In this method the sample of a sensor would be synchronized with the coded aperture program logic, which ensures the precision of MTF measurement. © (2013) Trans Tech Publications, Switzerland.


Liu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014

The extreme ultraviolet (EUV) solar telescope is one of the most important instruments to observe the solar dynamics. Fe-IX/X (λ=17.1 nm) and He-II (λ=30.4 nm) are fundamental spectral lines to the research of solar corona and are always be chosen by the EUV normal incidence solar telescope. A kind of multilayer was designed in order to realize reflecting 17.1 nm and 30.4 nm spectral at one mirror. According to the chosen principle of the EUV band, three materials, namely Si, B4C and Mo, are chosen to form two superposed period multilayers. The number of the periods and film thickness are optimized. The reflectivity of the optimized multilayer is calculated by computer. The feasibility of reflecting 17.1 nm and 30.4 nm at one mirror has been proved in theory. The multilayer is deposited on silicon slice by magnetron sputtering coating machine. The multilayer is measured by laser-plasma reflectometer. The results show that the reflectivities of the multilayer at 17.1 nm and 30.4 nm are 19.9% and 20.2%, respectively. Using correct filter, such as Mg filter or Zr filter, can reflect the single spectral line at 17.1 nm or 30.4 nm.


Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

In order to improve the signal to noise ratio of the system and reduce the false alarm rate, the structure type, correction of the image aberration and the image illumination uniformity were researched and analyzed. The telecentric and retrofocus structure was adopted. The system with the full field of view of 110°, the relative aperture of 1/3, and spectral range from 0.254 μm to 0.272 μm was designed. The analysis results demonstrate that the dispersion spot diameter is smaller than 53.7 μm, the relative distortion is smaller than 20% at 0.85 field of view, and the relative illumination uniformity is smaller than 15%. The structure is compact and feasible for ultraviolet warning camera. ©, 2014, Chinese Optical Society. All right reserved.


Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

In considering the exciting ability of array infrared cascade lasers (QCLs) in infrared multi-gas detection applications, a novel generator has been carried out accordingly. In respect to control scheme, the proposed driver utilizes Time Division Multiplexing (TDM) technology to perform driving test on four QCLs with center wavelengths at 3.5μm, 4.4μm, 7.5μm and 8.2μm respectively. Experimental results demonstrate during a long-term operation (>100 h), stability of drive current is better than 4×10-5A, linearity of the power system is better than 99.97%.


Wang R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2014

In order to restrain the scintillation effect in the course of laser transmitting through the atmosphere, the relation between the laser coherence and the scintillation index was researched. First, the mathematic model correlating with laser coherence was established based on the generation mechanism of scintillation effect. Then, the laser was divided into four beams, and the coherence was destroyed. On this basis, the atmosphere turbulence emulation experiment device was made using the random phase screen as core element, and the far field spot scintillation index with different laser coherence was evaluated. Experimental results indicate that the scintillation index with four beams reduce about 75% in comparison with single beam. So the availability of multiple partially coherent beams limiting laser intensity scintillation effect has been approved by the result of theory analyzing and experiment.


Zhou C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

In order to evaluate the temperature effect of telescopes, a precise thermal finite element model consists of telescope optical assembly systems, mount structure and electrical equipment was established. Temporal and spatial temperature distributions of the optical assembly and telescope structure were calculated under various thermal conditions including conductions, air convections, radiation and heat flux loading. Moreover, the thermo-elastic analysis was made to obtain thermal deformations of the telescope structure based on the resulting temperature distributions. The obtained results show that temperature variation has large effect on telescope mount and main optical system, and induced displacement between primary and second mirror has a magnitude of millimeter, so it must be controlled strictly. At last some thermal control ways were given in terms of protection dome, mount, primary mirror and so on.


Zhang X.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

This paper introduces the multi-band spectral fusion technology of laser receiving and color TV confocal-window. A continuous zoom lens with focal length of 20-450 mm and angel of vision from 13.68°×10.26°~0.61°×0.46° is adopted. Under the condition of concentrated or parallel light, the contrast tests are implemented respectively using cubic prism or flat glass to separate light. Results show that when using cubic prism under concentrated light in the big angel of vision of 13.68°×10.26°, with the biggest light incident angle, serious color deviation and image color distortion occur. With the decrease of angel of vision and light incident angle, the degree of image color distortion declines, and almost disappears when getting closed to the small angel of view of 0.61°×0.46° gradually. However, under the condition of using flat glass and parallel light to separate light, continuous zoom lens can not only meet the requirement of optical aberration in the whole range field of view, but also solve the color deviation problem occurred in cubic prism, which shows a regular image color. Under the restrict limitation of room size, the MTF of color TV optical system reaches 0.3 at 108 lp/mm and the design result meets the requirement of engineering application. ©, 2014, Editorial Office of Chinese Optics. All right reserved.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

The advantages of manufacturing a space aspheric mirror of SiC material are analyzed, and the key methods and technology of fabricating and measuring SiC aspheric surfaces are introduced and researched. The off-axis SiC aspheric mirror is ground and polished by computer controlled optical surfacing (CCOS) technology with a FSGJ-2 numerical control machine, the contour and optical parameters are measured and controlled by a coordinate measuring machine (CMM) and laser tracker. Finally, an example for fabricating and testing an off-axis parabolic mirror with an aperture of 820 mm is given. A null lens is specifically designed and customized in order to test the large aspheric mirror by interferometry and null compensation. The resulting PV and RMS of the surface error are 0.335λ and 0.018λ (λ is 632.8 nm), respectively, which meets the requirements of the optical design. © 2015 Chinese Optics Letters.


Guo R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

A Collins formula method with a scaling factor between the target and source plane is proposed for laser propagation in optical system design, which can be used to evaluate laser optical system performance and tolerance analysis. The laser propagation in optical systems can be calculated by the Collins integral formula, and an angular spectrum method is derived by coordinate substitution. It is introduced a scaling factor m, making the choice of the observation plane more flexible and the calculation more accurate. A laser optical system is designed, and its tolerance analysis is conducted by the angular spectrum method. The evaluation criterion is the laser spot radius in the far-field, which is defined by 86.5% power in bucket. The radius of the laser spot in 90 m distance is from 0.8 to 1.4 mm by the tolerance analysis, which the ideal expectation is 0.92 mm and the experimental result is 1.01 mm. In the distance of 47 m, the radius is from 0.42 to 0.73 mm by the tolerance analysis, which the ideal expectation is 0.48 mm and the experimental result is 0.46 mm. The experimental results agree with the results of the tolerance analysis well. The focal shift for laser propagation in optical systems is validated. The experimental results confirm the calculation and they prove the use of the method in laser focus optical system design. © 2015 Chinese Optics Letters.


Yan F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

A new method developed for wavefront error (WFE) testing of an assembled space telescope is described in this Letter. The main idea of this method is to image a small bright target on the focal plane array assembly by the space telescope itself; the imaging light beams can be reflected to the focal plane array by a plane mirror in front of the aperture of the system under test and two images (one is in-focus and the other is defocused) can be obtained. The WFE of the optical system can be calculated with a phase diversity algorithm according to two images of the target on the focal plane array assembly. The residual error and limitations of this method are discussed and a simulation result is shown, which shows the application potential of this technology. © 2015 Chinese Optics Letters.


Su W.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Electronics, Communications and Networks IV - Proceedings of the 4th International Conference on Electronics, Communications and Networks, CECNet2014 | Year: 2015

For this paper, the colored noise conditions were analyzed for optimal estimation of system error for integrated navigation systems by using the Kalman and H∞ filtering algorithms. The integrated navigation system uses the resulting difference between Strap-down Inertial Navigation (SINS) and Global Positioning System data (GPS) as the input value for the filter. The errors in the integrated navigation system are estimated and corrected by using one of the filtering methods in real time. The corrected SINS data output for the integrated navigation system is used to verify the effectiveness of the two kinds of filtering algorithms. The results showed that Kalman filter’s velocity and position estimate error are larger than that of the H∞ filter, with Kalman filter’s velocity estimates error range being up to 0.9m/s, while the H∞ filter’s maximum error is only 0.3m/s. Thus, the H∞ filtering algorithm has better stability and robustness. © 2015 Taylor & Francis Group, London.


Li R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

In this Letter, we present a method to measure the eccentricity of an off-axis asphere using a laser tracker during optical null testing. We first adjust the optical path of the null testing, and then probe some necessary reference surface on the compensator or the off-axis mirror's body with a laser tracker. Next, using the collected data to process, construct, build the coordinate system, solve, and so on, we obtain the eccentricity directly through comparing the central point of the asphere and the tested optical axis. A measurement experiment is conducted with a circular off-axis aspherical mirror; the result shows that the measurement accuracy can reach 0.1859 mm, 6.2% of its tolerance belt. © 2015 Chinese Optics Letters.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

This Letter reports a series of experiments on examining the removal function of a 400 mm magnetorheological finishing (MRF) polishing wheel which is aimed at large optical component fabrication. This MRF equipment is assembled on the large computer numerical control center whose effective axial length is 3000 mm. The two different removal functions of the wheel are used to virtually fabricate a 1450 mm concave fused silica aspherical optical mirror. The total fabrication times are 110 and 309 h, respectively. The final surface errors are eventually reduced to 0.014λ and 0.024λ after the process, and the convergence rates are 97.46% and 95.65% in one virtual fabrication cycle. The power spectrum density is used to analyze the spacial frequency based on the final simulating surface error, and the middle and low spacial frequency surface error controlling ability is analyzed in terms of different removal functions. © 2015 Chinese Optics Letters.


Xue D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

Null lenses are always used to test large convex aspheric mirrors. For large convex aspheric mirrors with large deviate wavefronts from the aspheric wavefront to its best sphere wavefront, a traditional null lens composed of a flat and a sphere cannot be used to test. An aspheric null lens needs to be designed and manufactured to test a large convex aspheric mirror with a large deviate wavefront. Another traditional null lens is used to guide the manufacture of the aspheric null lens. The accuracy and feasibility of the aspheric null lens are unknown and should be tested by a high precision computer-generated hologram (CGH). In the article, we introduce the principle of a null lens, designed an aspheric null lens to test a Φ338 mm aspheric SIC mirror whose radius of curvature is 1024 mm, the deviate wavefront from the aspheric wavefront to its best fit sphere wavefront is 66.5728λ PV (λ ¼ 632.8 nm). The result of the aspheric null lens that is tested by a CGH is 0.018λ RMS and satisfies the need of accuracy. The test result of the aspheric mirror is 0.030λ RMS. © 2015 Chinese Optics Letters.


Li J.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2014

In order to satisfy all-frequency error quality controlling and high-precision test during the process of the convex asphere, double laps with polar coordinate polishing technique and the measuring poles method used for the alignment of Hindle test are proposed. Firstly, the double laps with polar coordinate polishing technique for manufacturing the aspheric mirror and the numerical control machine for processing aspheric surface are presented. Then, the measuring poles method used to control the distances between vertex of the standard sphere and the vertex and focus of the tested asphere is introduced, and the controlling precision is analyzed. Finally, for a convex asphere with the aperture of Φ158 mm, the test results and precision of the Hindle test are described. The results indicate that the double laps polishing technique can make the low-frequency surface error convergence quickly, and the mid-frequency surface error is restrained at the same time. The controlling precision of the low-frequency surface error is about λ/30 (λ=633 nm). The limit error using the measuring poles to control the distance is ±0.065 mm, and the tolerances of the two space parameters are ±0.22 mm and ±0.30 mm, respectively. The fast manufacture and all-frequency controlling of the convex asphere are realized by the double laps with polar coordinate polishing technique, and the test result of low-frequency surface error is 0.022λ (RMS, @633 nm) in the Hindle test, which satisfies the specification requirements of the optical design.


Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

To improve the charging efficiency of lithium iron array batteries, a novel limiting voltage pulsed constant current equalizing charger is designed and developed, which is based on the time division multiplexing (TDM) technology. The proposed charger consists of high speed pulsed generator model, TDM signal generator model, constant current model and protection model, et al. In addition, the charger is combining with high speed analog proportional-integral-derivative (PID) feedback, which has the ability of regulating charging currents in each battery independently. In terms of software, digital discrete Ziegler-Nichols proportion-integral-derivative (PID) control algorithm is utilized, which can reduce the un-identity of battery characteristic, obtain the equalizing charging and enhance its using life much longer. Utilizing the proposed charger, a charging experiment is performed on four lithium ion batteries with the capability of 24V/24AH. The experimental results show that the stability of drive current is better than 4×10-5A, linearity of the power system is better than 99.97%, which can guarantee the quick charge of lithium iron array batteries.


Sun W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of 2013 IEEE 11th International Conference on Electronic Measurement and Instruments, ICEMI 2013 | Year: 2013

Network management system based on SNMP is a new way to manage the distributed photoelectric theodolites and their components. This paper presents the design of SNMP network management system by VC++ in Windows XP professional. Basic knowledge on network management and SNMP, SNMP architecture in Windows XP professional and program construction of network management system for theodolites and their components are also presented. © 2013 IEEE.


Yang M.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

Based on the cat-eye effect of photoelectric devices, this paper establishes a system of active laser detection with CCD, and puts forward an effective algorithm for detecting peeping devices. The proposed algorithm acquires one image when the laser power is on, and the other image when the laser power is off in the laser pulse interval. According to the echo intensity difference on the peeping devices and usual objects, the target is detected by using the background difference method. The experimental results show that, within a radius of 5 m, the system can effectively and quickly detect peeping devices from background, and is not influenced by the scene and light. Through the experiments on 20 different scenes, the correct detection rate is 95%, and the detection time of each frame is in the range of 0.015-0.021 s, meeting the demand of real-time detection, which validate the correctness and effectiveness of this system. © 2015, Editorial Office of Chinese Optics. All right reserved.


Ni Q.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

The research on key techniques of wide field extreme ultraviolet(EUV) spherical micro-channel plate(MCP) photon-counting imaging detector which will be used in space probe in China have been done. Firstly, the secondary electron yield model of photocathode material was built, and the secondary yield of alkali halide and MCP in soft X-ray and EUV band were calculated using the model. The measurement equipment of MCP's quantum detection efficiency also was set up. The calculated fomula of MCP's quantum efficiency was introduced, and MCP's quantum efficiency vs. wavelength and incidence angle in soft X-ray and EUV region were measured. secondly, the instrument of solid core spherical MCP fabrication was established, a set of spherical MCP with 150 mm radius were made using the instrument. The 48 mm induced charge wedge and strip anode in effective diameter was made by the use of traditional UV lithography, and the photon-counting imaging detector was integrated based on the anode and spherical MCP stack in Z configuration. Thirdly, the position readout electronics including analog frent-end and digital processing circuit and the software with image distortion rectification and real-time collection were developed. Finally, the measurement instrument of spherical MCP detector's spatial resolution and image linearity was built, and the specifications of the detector were measured using the instrument, showing that all technical specificaions of the detector satisfy the design requirements. © 2015, Editorial Office of Chinese Optics. All right reserved.


Wang L.,Jiangxi Normal University | Ye Y.,Jiangxi Normal University | Lu X.,Jiangxi Normal University | Wu Y.,Jiangxi Normal University | And 4 more authors.
Electrochimica Acta | Year: 2013

Detection of H2O2 is very important in biological analysis, clinical diagnosis, food industry, etc. This work presents an electrochemical approach for the detection of H2O2 based on Prussian blue (PB) nanocubes-nitrobenzene-reduced graphene oxide (RGO) nanocomposites (PB nanocubes-nitrobenzene-RGO). The hybrid nanocomposites were constructed by growing PB nanocubes onto the nitrobenzene-RGO composites which were prepared by spontaneous grafting nitrophenyl groups to the basal carbon atoms of RGO based on chemical bonding. The obtained PB nanocubes-nitrobenzene- RGO nanocomposites were characterized by scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The formation mechanism of PB nanocubes-nitrobenzene-RGO nanocomposites was investigated and discussed in detail. The PB nanocubes-nitrobenzene-RGO modified glassy carbon electrode shows good electrocatalysis toward the reduction of H2O2. The resulted H2O2 biosensor exhibited a rapid response of 2 s, a low detection limit of 0.4 μM, a wide linear range of 1.2 μM to 15.25 mM and high sensitivity of 300.16 μA cm-2 mM-1, as well as good stability, repeatability and selectivity. Further immobilizing glucose oxidase on the PB nanocubes-nitrobenzene-RGO nanocomposites/GCE, an amperometric glucose biosensor was achieved by monitoring the generated H 2O2 under a relatively negative potential. The sensors might be used as a promising one for practical application. © 2013 Elsevier Ltd. All rights reserved.


Xu J.-J.,Chinese Academy of Sciences | Xu J.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

A new method for fast image registration based on improved Harris-Sift algorithm is proposed. Firstly, classic Harris algorithm is improved by building Gaussian scale space to extract scale invariant Harris corners and they are refined to sub-pixel corners using Forsnter algorithm. Then the SIFT descriptor is utilized to characterize those feature points and the matching procedure is carried out via randomized kd trees. At last, RANSAC is used to remove wrong matches and the optimal transform parameters are estimated using the least square method to accomplish the image registration process. The experimental results demonstrate that compared with the classic SIFT algorithm the proposed method decreases the cost time of the registration procedure mostly by 64% while almost keeping the same performance. © 2015, Editorial Office of Chinese Optics. All right reserved.


Wang L.,Jiangxi Normal University | Lu X.,Jiangxi Normal University | Ye Y.,Jiangxi Normal University | Sun L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Song Y.,Jiangxi Normal University
Electrochimica Acta | Year: 2013

Nickel-cobalt nanostructures (Ni-Co NSs) electrodeposited on reduced graphene oxide (RGO)-modified glassy carbon electrode (GCE) was prepared and used for highly sensitive glucose detection. RGO nanosheets were firstly assembled onto GCE surface by π-π interaction and then Ni-Co NSs were constructed on RGO/GCE by dynamic potential scan. The electrochemical and electrocatalytic behaviors of the Ni-Co NSs/RGO/GCE toward glucose oxidation were evaluated by cyclic voltammograms, chronoamperometry and amperometric method. The effects of some factors related to the fabrication of Ni-Co NSs/RGO/GCE, such as potential scan number and the molar ratio of Ni 2+/Co2+ in a solution, on the catalytic performance of the Ni-Co NSs/RGO/GCE were also explored. The results showed that the Ni-Co NSs/RGO/GCE exhibited the best catalytic activity at the potential scan number of 20 and the Ni2+/Co2+ molar ratio of 1:1. The glucose concentration in the range of 10 μM to 2.65 mM linearly depended on the catalytic current (r = 0.9967, n = 17). The sensitivity was 1773.61 μA cm-2 mM-1, and the detection limit was 3.79 μM (S/N = 3). This high catalytic activity, good sensitivity and stability of the Ni-Co NSs/RGO/GCE sensor opened up a new kind of hybrid materials in electrochemical detection of glucose. © 2013 Elsevier Ltd. All rights reserved.


Wu Y.,Beihang University | Liu Y.,Beihang University | Tian D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Mathematical Problems in Engineering | Year: 2013

A compound fuzzy disturbance observer based on sliding modes is developed, and its application on flight simulator is presented. Fuzzy disturbance observer (FDO) is an effective method in nonlinear control. However, traditional FDO is confined to monitor dynamic disturbance, and the frequency bandwidth of the system is restricted. Sliding mode control (SMC) compensates the high-frequency component of disturbance while it is limited by the chattering phenomenon. The proposed method uses the sliding mode technique to deal with the uncompensated dynamic equivalent disturbance. The switching gain of sliding mode control designed according to the error of disturbance estimation is a small value. Therefore, the proposal also helps to decrease the chattering. The validity of the proposal method is confirmed by experiments on flight simulator. © 2013 Yunjie Wu et al.


Tian D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society | Year: 2015

Gear transmission is a feasible scheme to realize small size and large torque output manipulator. However, the nonlinear factors, especially the backlash and friction, seriously degrade the performance of a gear drive system. This paper proposes a twin-drive gear system to prevent performance degradation from the nonlinear factors. In the proposal, two motors drive the output axis with differential motion. All of the gears and axes in the system rotate in an invariant direction with nonzero velocity, which avoids the appearance of backlash and nonlinear friction. Moreover, new control scheme of the twin-drive gear is proposed based on the idea of bilateral control. This control scheme utilizes the information of velocity and torque in both the two motors. Ideal synchronized motion is achieved between the two motors, which maximizes the performance of the proposed mechanism. The proposal realizes linearized gear transmission compared with traditional single gear drive. Experiments and applications confirm the validity. © 2015 IEEE.


Tao S.H.,Central South University | Yang B.C.,Central South University | Xia H.,Central South University | Yu W.X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Laser Physics Letters | Year: 2013

There is high demand for a tailorable three-dimensional (3D) distribution of focused laser beams for simultaneous optical manipulation of multiple particles separately distributed in 3D space. In this letter, accurate control of the 3D distribution of laser beam foci is demonstrated with an array of customized fractal zone plates (FZPs). The FZPs are designed with a fractional number of fractal segments, so the focal lengths of the foci can be finely tailored. The unique focusing properties of the customized FZPs are investigated with both simulations and experiments. The FZP beams are also found to possess the self-reconstruction property, which would be useful for constructing 3D optical tweezers. © 2013 Astro Ltd.


Li H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings - IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011 | Year: 2011

This paper developed the internal model PID control for large telescope control system considerations in more parameters adjustment in servo control loop at present. The large electro-optic telescope system belongs to a big inertia system. This simplifies the debug process; the feasibility and robustability are also verified by the analyses and simulation results that satisfy the high precision demand. The practicability of this algorithm is verified in an actual project that only two parameters need adjusted. The application shows that this system runs stably with high accuracy. The technology and methods adopted in the system are practical and worthy of using abroad. © 2011 IEEE.


Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Stockman M.I.,Georgia State University
Physical Review Letters | Year: 2013

We consider theoretically the spaser that is excited electrically via a nanowire with ballistic quantum conductance. We show that, in the extreme quantum regime, i.e., for a single conductance-quantum nanowire, the spaser with a core made of common plasmonic metals, such as silver and gold, is fundamentally possible. For ballistic nanowires with multiple-quanta or nonquantized conductance, the performance of the spaser is enhanced in comparison with the extreme quantum limit. The electrically pumped spaser is promising as an optical source, nanoamplifier, and digital logic device for optoelectronic information processing with a speed of ∼100 GHz to ∼100 THz. © 2013 American Physical Society.


Liu D.,Northeast Normal University | Lu Y.,Northeast Normal University | Tan H.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen W.-L.,Northeast Normal University | And 3 more authors.
Chemical Communications | Year: 2013

Purely inorganic porous frameworks using catalytically active [MnV 13O38]7- clusters as nodes and rare earth ions as linkers have been successfully prepared. The POM-based porous framework is a kind of multifunctional material, which exhibits selective adsorption behavior and remarkable catalytic activity for the heterogeneous oxidation of sulfides. This journal is © The Royal Society of Chemistry 2013.


Wang X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang X.-K.,Changchun University of Science and Technology
Chinese Optics | Year: 2015

In order to meet the requirement of the engineering application about the real-time image processing, according to the one billion pixel transient cloud imaging system which has been designed based on the combined structure of a concentric spherical lens and micro camera mosaic array, an adaptive image mosaic algorithm of parallel acceleration based on the compute unified device architecture(CUDA) and prior information has been proposed. First, the imaging overlap region of the adjacent micro camera has been calibrated with high-precision four-axe calibration table, and the speed-up robust features(SURF) method has been used to extract the candidate feature points of the overlap region. Then, the approximate nearest neighbor(ANN) search algorithm based on random K-D tree which has been accelerated by the CUDA basic linear algebra subroutines(CUBLAS) is used to obtain the initial matching points. Finally, the improved parallel progressive sample consensus(IPROSAC) algorithm is used to eliminate the false matching points and estimate the parameters of the space transformation matrix, and the spatial geometry transformation relationship has been obtained about mosaic images. Experimental results indicate that the image mosaic time is 287 ms and the speed is improved about 30 times compared with serial algorithm using CPU. © 2015, Editorial Office of Chinese Optics. All right reserved.


Wang X.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

The optical vortex distribution of the dynamic speckles in the interferometry and the corresponding variation characteristics were obtained by Fourier transform with Laguerre-Gaussian filter. The change of dynamic speckle caused by the movement of the nano-magnetic particles is the same as appearing in the change of the singular distribution. And when the nanometer magnetic particles moved in the gathered process into dispered process, the dynamic speckle singularity distribution illustrated that there were two variations of the vortex density, to begin with from big to small, and to end with from small to big that corresponded to the magnetic liquid movement. The optical vortex density is big corresponding smaller spot speckles and the magnetic fluid in the steady moving. The optical vortex density is little corresponding to the larger spot speckles and the magnetic fluid in the intensely moving. Research results indicate the existence of the relation between the movement of the nano-magnetic particles and the variations of the singular distribution. © 2015, China Science Publishing & Media LTD. All right reserved.


Wang R.,State Key Laboratory of Laser Interaction with Materials | Wang R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

The experiment system to analyze the image SNR with different gate width was used in this paper for confirming the range gating imaging SNR with different laser range measuring accuracy. First of all, the system parameters were determined according to the coverage model of the laser range gating imaging. On the basis of that, the experiment system was established and the outdoor experiment research was made with this system. The comparison analyzing of different gate width image also was made, and the curve of the relation between gate width and image SNR was obtained. The final experiment result indicates that the image SNR≥8 with gate width ≤2 μs can satisfy the requirement of auto recognition, which indicates that the range gating imaging system has no very strict requirement to the range measuring accuracy, and can satisfy the practical application requirement. © 2015, China Science Publishing & Media LTD. All right reserved.


Dong L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

This paper concluded measurement methods based on wavefront splitted principle such as Young interference method, reversed-wavefront Young interference method, nonredundant array interference method and measurement methods based on amplitude splitted principle such as self-referencing interference method. Their basic principles and experimental setup were introduced, and then the merits and defects of these methods were compared, and then the best applied field of each method was put forward. The conclusion of this paper could be used as elementary guidance for different demands of spatial coherence measurement to choose proper methods. © 2015, China Science Publishing & Media LTD. All right reserved.


Tao X.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

A precise alignment method based on special target and fast point matching is proposed. The target includes four point-pairs for magnification calibration in peripheral area and one large-small point-pair for registration in center area. Distortion calibration of the alignment system is completed at the first time of operation. When the optical testing arm or the fabrication arm reset, the target area is focused automatically. The image captured is used to calculate the magnification of the system. Then, the large-small point-pair is located and the angle of the line through the two points is employed to adjust the swivel table, while the distance between the two points is applied for correction of the guide rail. The procedure is repeated iteratively until current location coincides with the ideal position. It is proved that the alignment accuracy of the method is about 5 μm, which is better than the precision of mechanical approach and is helpful for rapid and precise optical fabrication, and can improve the consistency of the optical testing simulation path and the practical fabrication path. © 2015, China Science Publishing & Media LTD. All right reserved.


Wu G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2015

Stability of three-dimensional mapping spacecraft CCD line array camera is to ensure that high-precision three-dimensional mapping of key indicators. Development of a new generation of mapping camera before, it's need to solve basic problems calibration stability. Paper proposes a high-precision self-collimation theodolite intersection measurement calibration method, to solve the multi-axis optical sensor complex system stability intersection angle precision calibration problem. The method uses a precision of 0.5″ to 4 self-collimation theodolite reference mirror cube mapping camera on two orthogonal planes were being inverted microscope auto-collimation measurements. Then pour mutual aim being, and through multiple rounds calculable transformation matrix between the cubic mirror. Analysis and validation experiments show that, the calibration method repeatability is 0.5″, and closed loop calibration accuracy of a 1″ middleweight. The actual mapping camera calibration results show that the mechanical tests before and after, the maximum change in contact angle of 5.1″, which meet the requirements of the stability index of less than 10″. © 2015, Editorial Office of Chinese Journal of Scientific Instrument. All right reserved.


Wei H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of 2011 International Conference on Computer Science and Network Technology, ICCSNT 2011 | Year: 2011

To improve the image processing system of resolution capability and reliability, image processing system in a growing number of multi-sensor model. In this mode, the use of the current main stream single DSP + FPGA hardware architecture for image processing algorithms have already unable to meet the operational requirements of real-time. This paper proposed a new hardware architecture that is the three DSPs based on FPGA. With the traditional master-slave architectures is different, three DSP's external interfaces are connected with FPGA and other peripheral interfaces are connected to the FPGA. In the architecture, DSP is in the same position three and FPGA flow control for data management and other function to achieve. This connection has a strong restructuring and expansion, software development and more flexible. © 2011 IEEE.


Fu X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

A compact all-solid-state intracavity sum-frequency mixing laser at 608.1 nm is reported. A Nd:YAG crystal and a Nd:YVO4 crystal are pumped by two laser diodes respectively in two sub-arms of the laser cavity. In the two arms, laser wavelengths of 1 342 nm from Nd:YVO4 crystal(corresponding to the 4F3/2-4I13/2 transition) and 1 112 nm from Nd:YAG crystal(corresponding to the 4F3/2-4I11/2 transition) are selected to be mixed into 608.1 nm laser. Through optimization of the cavity design, better matching of the modes for the two wavelengths is obtained. In the overlapping of the two arms, sum-frequency mixing is generated with a type I phase-matching LBO crystal. The experiment result shows that a stable and low noisy output of 23.8 mW at 608.1 nm is obtained at the incident pump power of 740 mW for the Nd:YAG crystal and 600 mW for the Nd:YVO4 crystal. It is an efficient way to obtain 608.1 nm laser with the sum-frequency mixing structure proposed in this article. © 2015, Editorial Office of Chinese Optics. All right reserved.


Xin T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2013

Diffraction efficiency is an important performance indicators of the type IV concave grating, and parallel ion beam etching etching process is difficult to obtain a high diffraction efficiency of type IV concave grating. External controllable magnetic field leads to the parallel ion beam to achieve the deflection of the ion beam is a novel means for the realization of a type IV along the curved surface of the concave grating different blaze angle ion beam etching, and in this way possible to obtain a high diffraction efficiency type IV concave grating. After a theoretical design ideal type IV concave grating blaze angle, use of the holographic exposure-bending ion beam simulation etching size 45 × 40mm2, wavelength 250nm at diffraction efficiency of 67%, the arm is 200mm, 188mm, the radius of curvature 224mm of type IV concave grating. Meanwhile, the use of parallel ion beam current of the same parameters of the analog etching type IV concave grating, the diffraction efficiency at 250nm was 30%. The simulation results show that the bending ion beam produced type IV concave grating principle of the method is feasible, and the ability to precisely control the ion beam the concave grating type IV high diffraction efficiency production. © (2013) Trans Tech Publications, Switzerland.


Zhang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The means to get the accurate high-orbit satellite magnitude can be significant in space target surveillance. This paper proposes a satellite photometric measurement method based on image processing. We calculate the satellite magnitude by comparing the output value of camera’s CCD between the known fixed star and the satellite. We calculate the luminance value of a certain object on the acquired image using a background-removing method. According to the observation parameters such as azimuth, elevation, height and the situation of the telescope, we can draw the star map on the image, so we can get the real magnitude of a certain fixed star in the image. We derive a new method to calculate the magnitude value of a certain satellite according to the magnitude of the fixed star in the image. To guarantee the algorithm’s stability, we evaluate the measurement precision of the method, and analysis the restrict condition in actual application. We have made plenty of experiment of our system using large telescope in satellite surveillance, and testify the correctness of the algorithm. The experimental result shows that the precision of the proposed algorithm in satellite magnitude measurement is 0.24mv, and this method can be generalized to other relative fields. © 2015 SPIE.


Xu C.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2016

Due to its special structure, graphene has very good optical, electrical, mechanical and other properties, and it is regarded as a breakthrough of the new materials. Thanks to the wide band gap, thermal stability, high working power and other properties, GaN based materials have become “the most important, after the silicon semiconductor material.” It will bring great benefits for the photoelectric and microelectric devices if the graphene can be successfully combined with GaN based materials. There have already been some breakthroughs in the research of combination of graphene and GaN based materials. This paper briefly summarized recent findings of physical mechanisms of the contact between graphene and GaN-based materials and the researches of the applications of graphene to the GaN-based materials. © 2016, Science Press. All right reserved.


Deng W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2013

The optical characterization of LaF3 thin film in DUV spectral range was experimental investigated by using a variable angle purged UV spectroscopic ellipsometer. In order to take into account the inhomogeneity, a theory model that dividing the single thin film into several sublayers was adopted. Two kinds of LaF3 thin films fabricated on fused silicate substrate with different substrates temperature were tested. From the obtained optical index and the physical thickness of different sublayer in the two different kinds of LaF3 thin films, it was found that, the inhomogeneity of the LaF3 thin film deposited with substrate temperature at 300°C was stronger than that of the LaF3 thin film deposited with substrate temperature at 250°, indicating that the substrate temperature has important influence on the optical index and inhomogeneity of LaF3 thin films. For both of the two kinds LaF3 thin films, the agreement between the measured transmittance and the simulated transmittance using the parameters from regression of SE was nice, indicating that the selection of the material dispersion law and regression procedure were successful. © (2013) Trans Tech Publications, Switzerland.


Deng W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2013

The Interfacial layer has an important influence on the optical performance of the deep ultraviolet (DUV) coatings. The variable angle Spectroscopic ellipsometry measurements of three kinds of DUV coating samples were performed in the wavelength range 150-500nm using a purged variable angle Spectroscopic ellipsometer. The samples include the single layer sample, double layers sample, and three layers sample. The thickness and optical index of the MgF2 layer and LaF3 layer as well as those of the interfacial layer between them were obtained by successful regression of the SE measurements. For the single layer, the agreement of the results between the SE and the spectrophotometic techniques was very good. The obtained thickness of the two kinds of interfacial layer was in consistent with the RMS results of the single layer obtained by AFM, indicating the obtained results were reliable. © (2013) Trans Tech Publications, Switzerland.


Tan X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering | Year: 2015

The development and application of spectrum instruments has been seriously restricted due to the low diffraction efficiency of rectangular Rowland gratings at short wave. The blazed Rowland grating, in contrast, enjoys higher diffraction efficiency. However, its research is inadequate at home and abroad. Through optimization design of rectangular and blazed gratings, blazed Rowland grating design result with high diffraction efficiency at short wave was obtained. Using reactive ion beam etching, three blazed Rowland gratings were fabricated with wave band of 200-450 nm, linear density of 2400 gr/mm, and caliber of Φ63.5 mm. The peak diffraction efficiency of blazed Rowland grating 2 achieved 65%@220 nm, which is 25% higher than that of rectangular Rowland grating produced by HORIBA Jobin Yvon Inc., and equal to theoretical diffraction efficiency. The experimental result indicates that the blazed Rowland gratings fabricated through reactive ion beam etching process have higher diffraction efficiency than the similar overseas products, and the process is controllable and stable. ©, 2015, Tianjin University. All right reserved.


Wang N.,Hong Kong Polytechnic University | Zhang X.,Hong Kong Polytechnic University | Wang Y.,Hong Kong Polytechnic University | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chan H.L.W.,Hong Kong Polytechnic University
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2014

Photocatalytic water purification utilizes light to degrade the contaminants in water and may enjoy many merits of microfluidics technology such as fine flow control, large surface-area-to-volume ratio and self-refreshing of reaction surface. Although a number of microfluidic reactors have been reported for photocatalysis, there is still a lack of a comprehensive review. This article aims to identify the physical mechanisms that underpin the synergy of microfluidics and photocatalysis, and, based on which, to review the reported microfluidic photocatalytic reactors. These microreactors help overcome different problems in bulk reactors such as photon transfer limitation, mass transfer limitation, oxygen deficiency, and lack of reaction pathway control. They may be scaled up for large-throughput industrial applications of water processing and may also find niche applications in rapid screening and standardized tests of photocatalysts. © 2014 The Royal Society of Chemistry.


Wang D.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2013

In order to get ultra-smooth surface without subsurface damage efficiently for fused silica, the atmospheric pressure plasma processing (APPP) is developed. It is based on chemical reaction between active radicals excited by plasma and workpiece surface atoms, so the subsurface damage caused by contact stress can be avoided and atomic-level precision machining can be achieved. In this paper, the influence on material removal function by the key factors of APPP including the flow rate of reaction gases, input power, and processing distance are discussed. In addition, by the regression model a quantitative mathematical model of the material removal function of the atmospheric pressure plasma processing on fused silica is established. And this model is verified by experimental data. © (2013) Trans Tech Publications, Switzerland.


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2016

Space-based multi-model differential optical absorption hyperspectral imager is a new type space atmospheric sounder. It requires the multi-model sounding functions including nadir, limb and sun occultation. It chiefly sounds the trace gases such as SO2, NO2 and so on. A new method of multi-model sounding with high spectral resolution is proposed. The method uses two-scanning mirrors to switch differential sounding model, double-spectrometers to reduce the spectral stray light, and dichroic filter to divide working waveband into three channels. An optical system of multi-model differential optical absorption hyperspectral imager is designed. The instantaneous field of view is 1.8°×0.04°. The F number of the system is 2. The working waveband is 250~500 nm, which is divided into three channels, the first one is 250~310 nm, the second one is 300~410 nm, and the last one is 400~500 nm. Optimization design and analysis are performed by ZEMAX-EE software. The spectral resolution is 0.12 nm in the waveband of 250~310 nm, which satisfies the requirement specification of no more than 0.4 nm. The spectral resolutions are 0.25 nm and 0.23 nm in the waveband of 300~410 nm and 400~500 nm, respectively, which satisfy the specification requirement of no more than 0.6 nm. The modulation transfer function (MTF) of multi-model differential optical absorption hyperspectral imager is more than 0.98 at characteristic frequency of 0.25 lp/mm in the spatial dimension. The design results satisfy the requirements of multi-model differential optical absorption hyperspectral atmospheric sounding. © 2016, Chinese Lasers Press. All right reserved.


Zhang X.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2015

According to the scientific theory and logic of biological evolution, this paper analyzed the evolution strategy selection of anti-erosion wear of the desert lizard, and proposed that wind was the major factor and main contradiction of anti-erosive wear. On the basis of the typical pit form extracted from the desert lizard's skin, the combined method of numerical simulation and theoretical analysis were used to analyzed the air flow field form of pit surface and explained the anti-erosion wear mechanism of bionic pit form, and also supplemented the anti-erosion wear evolution strategy of desert lizards, which provided a theoretical reference for the engineering bionic design. ©, 2015, Beijing University of Technology. All right reserved.


Bing G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2012

The high capability of O-E theodolite to track and acquire fast moving targets is required these years because of the rapid advancement of tested targets and automation of equipments. The traditional method of increasing the frequency width is limit. By using multi control models and velocity leading, the capability to track and acquire fast moving target is improved highly. The theories and technologies discussed in this dissertation were tested with experiments. It verifies that the theoretical analysis in this dissertation is correct. © (2012) Trans Tech Publications, Switzerland.


Huang W.,Soochow University of China | Chen L.,Soochow University of China | Xuan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
RSC Advances | Year: 2014

Performances of organic distributed feedback (DFB) lasers made from holographic polymer dispersed liquid crystal (HPDLC) transmission gratings were greatly improved by replacing common laser dye with organic semiconductor poly(2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylenevinylene) (MEH-PPV) as the gain medium. The MEH-PPV layer was laminated between the glass substrate and the HPDLC grating layer. Light interaction for feedback is provided by an evanescent wave spread into the grating layer. The device showed single-mode, TE polarized laser emission with a threshold of only 0.17 μJ per pulse (17 μJ cm-2). Slope efficiencies as high as 4.7% and 6.5% were measured for optical pumping of the device with P polarization and S polarization, respectively. Lasing was also coupled by the grating out of the waveguide and into free space. Furthermore, the output laser wavelength was systematically tuned over a range of 43 nm by varying the grating period. The laser thresholds at different wavelengths trace well with the amplified spontaneous emission spectrum of the MEH-PPV film. In terms of the HPDLC technique, our results show there is still plenty of potential to be exploited for fabricating organic DFB lasers. © the Partner Organisations 2014.


Wu J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2012

This paper presents a statistical method to estimate the parameters of the brushless dc (BLDC) motor of a flywheel system for energy storage. The principle of the estimation is based on least square estimation under a reasonable constraint. Method is suitable to avoid using complicated test apparatus. Torque constant, static friction coefficient, vicious friction coefficient and inertia moment can be estimated. Furthermore, copper loss, iron loss, mechanical loss and other loss can be computed from these estimation and measurement data. By the proposed method, it is demonstrated experimentally that accuracy estimation can be achieved. © 2012 IEEE.


Miao E.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

Paraboloid is a special asphere and is widely used in optical system. This paper is focused on the Paraboloid testing error analysis and synthesis in practical. A paraboloid from ZYGO is tested using three different methods which are computer generated hologram (CGH), small ball and multi-zone stitching metrology method. The three methods are realized in a fine controlled lab utilizing ZYGO FIZEAU interferometer and the test results are compared and analyzed. Error synthesis is also performed and the uncertainty of the tests is less than 4.5nm. © 2012 SPIE.


Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The method of bonnet polishing is successfully used to polish an aspheric surface with an aperture of 200 mm and a maximum departure of 700 μm. Based on the principle of bonnet polishing, we employ one IRP 600 machine to finish the aspheric surface which was previously ground to an asphere by Satisloh. According to the analysis of error map obtained by the help of CGH after each iteration, several technological parameters are well verified and the whole precession process is proved to be under good control when the material to be polished is fused silica. With total 12 iterations of 30 hours including 5 pre-polishing iterations and 7 corrective iterations, the surface form accuracy of 80nm (PVq) and 15nm (RMS) over the full aperture is achieved. The results indicate that bonnet polishing can not only realize good form accuracy, but also eliminate a certain mid-frequency effect left by grinding. © 2012 SPIE.


Xu X.,Jilin University | Li X.,Jilin University | Wang W.,Jilin University | Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
RSC Advances | Year: 2014

In this work, a simple route for the synthesis of irregular In 2O3 nanoplates in the presence of oleic acid and urea is described. The structure and morphology of the as-obtained product were characterized using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results indicate that the synthesized In2O3 nanostructures are composed of irregular nanoplates. The gas sensing properties of the as-obtained product were investigated. The sensor based on the In 2O3 irregular nanoplates exhibits a remarkably enhanced response and a fast response/recovery time towards NO2. © 2014 The Royal Society of Chemistry.


Chen H.,Shanghai University | Chen H.,Jinan University | Pan T.,Jinan University | Chen J.,Jinan University | And 2 more authors.
Chemometrics and Intelligent Laboratory Systems | Year: 2011

Savitzky-Golay (SG) smoothing and moving window partial least square (MWPLS) methods were applied to the model optimization and the waveband selection for near-infrared (NIR) spectroscopy analysis of soil organic matter. The optimal single wavelength prediction bias (OSWPB) was used to evaluate the similarity of calibration set and prediction set, and a new division method for calibration set and prediction set was proposed. SG smoothing modes were expanded to 540 kinds. The specific computer algorithm platforms for optimization of SG smoothing mode combined with PLS factor and for MWPLS method with changeable parameters were built up. The optimal waveband for soil organic matter was 1926-2032nm, the optimal smoothing mode was the 2nd order derivative, 6th degree polynomial, 45 smoothing points, the PLS factor, RMSEP and RP were 8, 0.260 (%) and 0.877 respectively. The prediction effect was obviously better than that in the whole spectral collecting region. To get stable results, all the optimization processes were based on the average prediction effect on 50 different divisions of calibration set and prediction set. © 2011 Elsevier B.V.


Xia T.,University of Missouri - Kansas City | Wallenmeyer P.,University of Missouri - Kansas City | Anderson A.,University of Missouri - Kansas City | Murowchick J.,University of Missouri - Kansas City | And 2 more authors.
RSC Advances | Year: 2014

Following our previous findings on hydrogenated black TiO2nanoparticles, here, we would like to present our exciting findings on hydrogenated black ZnO nanoparticles, which have displayed long-wavelength absorption and excellent photocatalytic performance. This further demonstrates that hydrogenation is a powerful tool to enhance the optical and photocatalytic performance of nanomaterials. This journal is © the Partner Organisations 2014.


Xue Q.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2012

In order to meet the urgent requirements of space remote sensing, a spaceborne low-distortion and super-wide-angle aerosol imager system is designed. The system is a multi-spectral imager with the working wavelength band from 0.860 μm to 0.965 μm, and its full field of view is 94° and the relative aperture is 1: 4.By using a retrofocus structure, its back working is 42 mm in the optical system. Based on the aberration characteristics of retrofocus structure, methods for correcting distortion and improving the illuminance distribution are proposed. Its distortion is corrected by choosing suitable quadric surface, and the illuminance distribution on image plane is improved by using effective aberration vignetting resulted from stop aberration. Ray tracing, optimization and analysis are performed by CODE V and ZEMAX software. The analysis results demonstrate that the maximum distortion is less than -1.6%, and the illuminance at edge field of view is higher than that of 46.9% of central field of view and the MTF is higher than 0.59 at Nyquist frequency 38.5 lp/mm, which satisfies the requirement. Its structure is compact and feasible for space remote sensing. The design method is proved to be feasible.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhou M.,Harbin Institute of Technology
Mocaxue Xuebao/Tribology | Year: 2012

The surface roughness of workpiece was directly related to the tool wear in diamond cutting of optical glass. To investigate diamond cutting tool wear and its influence on the surface roughness, experiments of diamond turning with cutting distance were carried out on soda-lime glass in this work. The wear morphology of diamond tool and the material composition of flank wear area were detected, and then the corresponding surface features of soda-lime workpiece and the surface roughness were determined. Experimental results indicate that the wear on rake face was characterized by the smooth and uniform crater. The wear land on flank face extended with the increase of cutting distance and became rough gradually by micro-grooves along the cutting direction. Surface roughness, i.e. R q, R a and R max of workpiece at a cutting distance of 150 m, was lower than 32, 25 and 300 nm, respectively. Once the cutting distance exceeded 150 m, the surface roughness of the workpiece increased rapidly. The main mechanisms inducing tool wear in diamond cutting of glass were mechanical wear, thermo-chemical wear and abrasive wear.


Gao S.Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2013

This paper presents a data recorder used in UAV. The data recorder is implemented base on an embedded platform which is composed of a microcontroller and a compact flash controller. The recorder employs an optimized recording algorithm for rapid storage. The algorithm is able to set the number of sectors to be written dynamically according to the data throughput in order to minimize the response time of the compact flash controller. The recorder has a multi-area scheme to achieve a real-time storage without overwriting which could be applied to aircraft where the parameters should be record in time for analysis after experimentation. © (2013) Trans Tech Publications, Switzerland.


Zhan D.,Nanyang Technological University | Yan J.,Nanyang Technological University | Lai L.,Nanyang Technological University | Ni Z.,Nanjing Southeast University | And 2 more authors.
Advanced Materials | Year: 2012

Graphene exhibits many unique electronic properties owing to its linear dispersive electronic band structure around the Dirac point, making it one of the most studied materials in the last 5-6 years. However, for many applications of graphene, further tuning its electronic band structure is necessary and has been extensively studied ever since graphene was first isolated experimentally. Here we review the major progresses made in electronic structure engineering of graphene, namely by electric and magnetic fields, chemical intercalation and adsorption, stacking geometry, edge-chirality, defects, as well as strain. Tuning the electronic band structure of graphene is of great importance for its application in electronic devices. In this paper, we review the recent progress in electronic structure engineering of graphene, by applying electric and magnetic fields, introducing chemical intercalation and adsorption, changing stacking geometry and edge structure, introducing defects, as well as applying strain. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ma Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jishu/Optical Technique | Year: 2012

In order to modify the surface figure of high precision optics, the basic theory of computer-controlled optical polishing technology is introduced. The removal function is gained in the experiment and the dwell time is solved by iteration, and then the fringe date is extended with average algorithm. The process of a φ100 mm diameter optics is simulated as an example. The distributing of dwell time and surface figure processed are gained. Its surface figure accuracy peak-to-valley (PV) is improved from initial 243.132 nm to final 21 nm, and root-mean-square (rms) is improved from initial 53.154 nm to final 1.6 nm after 1843.3 minutes. The high precision optics can be figured using the removal function gained, and the precision of the dwell time solving method is high. In the meantime, the edge effect is well controlled with date expansion. Some theory base is provided for the practical high precision surface figuring.


Wang T.-T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

As pin holes of sintered silicon carbide formed in manufacturing process cause serious surface scattering of mirrors, this paper proposes a surface modification technique to decrease the surface scattering of sintered silicon carbide mirror. A silicon layer was deposited by plasma ion assisted deposition technique on the mirror as a surface modification coating to eliminate the defects on the mirror surface and to decrease the surface scattering effectively. A scanning electron microscope was applied to characterize of the morphology of the sintered silicon carbide sample, and the surface scattering origin was systematically analyzed. A total integrated scattering instrument was established. Then the total integrated scatterings of the sintered silicon carbide samples before and after surface modifications and a fine polished K9 glass sample were measured. The results indicate that the total integrated scatterings of the sintered silicon carbide sample before and after surface modifications are 3.92% and 1.42%, respectively, and that of the K9 glass sample is 1.36%. The surface root mean square roughnesses of the sintered silicon carbide sample after surface modification polishing and the fine polished K9 glass sample are 1.63 nm and 1.04 nm respectively. These results demonstrate that the defect of the sintered silicon carbide is successfully eliminated after surface modification, the surface scattering is greatly decreased, furthermore the surface optical performance is quite close to that of the K9 glass. ©, 2014, Chinese Academy of Sciences. All right reserved.


Xue Q.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2011

Based on the requirements of high resolution and wide field of view, considering the restrictive off-the-shelf detectors, the design method of split Field of View (FOV) is developed. The principle of split FOV is analyzed. A spaceborne high resolution hyperspectral imager with wide FOV is designed using the method. The hyperspectral imager are composed of a 11.42° telecentric off-axis Three-Mirror Anastigmatic (TMA) telescope and two Offner convex grating spectral imaging system. Ray tracing, optimization and analyzing are performed by CODE V software. The analyzed results demonstrate that the Modulation Transfer Function (MTF) for different spectral band is more than 0.7, which satisfies the pre-designed requirement.


Wang X.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

On the characteristics of the interpolation, gradient-based and Newton-Rapshon algorithms used in the sub-pixel process in the laser speckle technology, the same laser speckle pattern was calculated one by one with the three sub-pixel algorithms under the drying process of the magnet fluid, and the mean bias errors and the standard deviation curves in a sub-pixel scale were worked out. The characteristics of the three algorithms to process the laser speckle pattern given by the mean bias error and standard deviation were discussed and the calculation accuracy, stability and calculation consumption were compared. It is shown that the precision and stability of the gradient-based algorithm is higher in the small deformation within the sub-pixel displacement measurement. The computing efficiency of the gradient-based algorithm is approximately nine times faster than that of Newton-Rapshon method. Therefore, it is more efficient to take advantage of the gradient-based algorithm to calculate the laser speckle in the small deformation and the sub-pixel displacement measurement.


Xia M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2016

To solve the defects of lack objectivity and too much noise source of human pulse signal, based on micro-vibration measuring technique, a computer-controlled signal acquisition system was developed with strain sensor to acquire clear pulse signal at suitable pressure. Using the strain sensor as system core to adjust the pressure through air bag, the probe was directly contacted with human body to collect the micro-vibration signal. Under different environment, the signal should be processed to improve the signal quality. The micro-vibration signal was analyzed with empirical mode decomposition (EMD) and wavelet analysis to acquire accurate pulse signal. The results show that under different pulse taking pressure, the resolution can reach 0.01 N, and the relative error is less than 5% with linear degree of 5%. Compared to piezoelectric material, the strain sensor has higher stability and static accuracy. © 2016, Editorial Department of Journal of Jiangsu University. All right reserved.


He B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2012

The study about the direction-of-arrival (DOA) estimation for wideband signals is a basic topic of Signal Processing. The method called test of orthogonality of projected subspaces (TOPS) does not require initial values to form focusing matrix compared with the coherent signal subspace method (CSSM), but it has poor performance for coherent wideband signals at low signal-to-noise ratio (SNR). Based on the lack of the conventional TOPS, this paper reconstructs a set of new matrices with the narrowband correlated matrices coming from the DFT decomposition of the array output and modifies the method frame of the conventional TOPS. So we get a set of reconstructed matrices with full rank corresponding to each frequency bin, and which have no array aperture loss. The improved TOPS can estimate the DOA for coherent wideband sources at low SNR, and enhances the performance of the conventional TOPS. Simulation results show that the improved TOPS is effective, and the total performance of which is similar to the rotational signal-subspace (RSS) method. © (2012) Trans Tech Publications.


Xue Q.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2012

In order to meet the urgent requirements of detecting atmospheric trace gas in limb observation geometry, an optical system of spaceborne broadband limb sounder for detecting atmospheric trace gas is designed. The system is an imaging spectrometer with the working wavelength band from 0.3 μm to 0.7 μm, and its full field of view is 2.4°, focal length is 120 mm, and the relative aperture is 1:6. To avoid the problems of the classical Czerny-Truner spectrometer, such as low spatial resolution caused by large astigmatism, a modified Czerny-Turner spectrometer is designed, in which astigmatism can be corrected simultaneously in a wide band. By matching the modified Czerny-Turner spectrometer with a off-axis parabolic telescope, an example of limb sounder optical system is designed. Ray tracing, optimization and analysing are performed by ZEMAX software. The analyzed results demonstrate that the astigmatism is substantially corrected, and the MTF for different spectral band is more than 0.69, which satisfies the pre-designed requirement and proves the feasibility of the astigmatism-correction method.


Zhang J.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

This paper reviews the functions of telescope enclosures in brief and summarizes the universal principle of observatory site selection. Then, it introduces the structure types, working characteristics and environmental conditions of typical telescope enclosures at abroad. By taking an enclosure with an aperture of 3.67 m in the advanced electro-optical system as an example, the thermal control scheme for the enclosure is analyzed, and the golden rule and methods of thermal design of modern telescope enclosures are proposed in detail. Furthermore, several kinds of key factors to be taken into account in design are pointed out. Finally, the design and analysis method for telescope piers are also discussed.


Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2013

This paper presents a parametric optimization approach to solve reentry guidance. Due to the various constraints imposed on the trajectory, original guidance problem can be converted into an optimal control problem with a merit function to be minimized. Direct implementation of method of variation and is too complex to get a reasonable result, while a numerical parametric optimization approach is feasible and efficient if we choose appropriate control variables as the optimization parameters and effective optimization algorithm. A simulation of the approach is performed to show its validity on reentry guidance problem: as the value of merit function converges to acceptable threshold, all constraints are hold. © (2013) Trans Tech Publications, Switzerland.


Lu Y.,Changchun University of Science and Technology | Zhai P.,Changchun University of Science and Technology | Xia J.,Changchun University of Science and Technology | Fu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li S.,Changchun University of Science and Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2012

A dual-wavelength continuous-wave (cw) diode-end-pumped Nd:YAlO3 (Nd:YAP) laser that generates simultaneous laser at the wavelengths 1079.5 nm and 1064.5 nm is demonstrated. The optimum oscillation condition for the simultaneous orthogonal polarized dual-wavelength operation has been derived. A polarization beam splitter was placed in the cavity to split the beams polarizing in two orthogonal directions. We obtained a total power output over 6.5 W in two orthogonal polarized beam directions with 4.64 W in c-axis polarization and 1.86 W in a-axis polarization. Intracavity sum-frequency mixing at 1079.5 and 1064.5 nm was then realized in a KTiOPO4 (KTP) crystal to reach the green range. We obtained a cw output power of 1.12 W at 536 nm at the incident pump power of 17.3 W. © 2012 Optical Society of America.


Jin L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
CCIE 2011 - Proceedings: 2011 IEEE 2nd International Conference on Computing, Control and Industrial Engineering | Year: 2011

For the limitation of data transmission bandwidth and real time transmission demand, generally image compression is required to implement the precise and flexible rate control algorithm. Rate control is an important issue in the image compression field. This paper considers the problem of rate allocation to each encoded segment for CCSDS image compression. One straightforward method is to allocate an equal amount of rate to each segment based on the average of the total number of compressed bytes. The obvious drawback of this method is that different segment will be reconstructed to different quality, so the overall quality of the reconstructed image will not be optimized. For the shortage of the original rate control method, as to improve the overall quality of the reconstructed image, an improved rate control algorithm is proposed for CCSDS image encoding. The key component of the proposed rate control method is the appropriate rate allocation. Experiments on the test images show that the PSNR can be increased at about 0.3dB on average, compared to the original algorithm. Therefore, experimental results confirm the effectiveness of the proposed algorithm in terms of objective evaluation, and the rate-distortion performance of the reconstructed image is improved. © 2011 IEEE.


Jiang D.L.,Harbin Normal University | Li L.,Harbin Normal University | Chen H.Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.Y.,University of Chinese Academy of Sciences | And 4 more authors.
Applied Physics Letters | Year: 2015

A metal-semiconductor-metal (MSM) structure ultraviolet photodetector has been fabricated from amorphous InGaZnO (a-IGZO) film at room temperature. The photodetector can work without consuming external power and show a responsivity of 4 mA/W. The unbiased photoresponse characteristic is attributed to the hole-trapping process occurred in the electrode/a-IGZO interface, and a physical model based on band energy theory is proposed to explain the origin of the photoresponse at zero bias in our device. Our findings may provide a way to realize unbiased photoresponse in the simple MSM structure. © 2015 AIP Publishing LLC.


Yan C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Remote Sensing | Year: 2014

Hyperspectral sensing can provide richer information in earth observation, because of the technical characteristic of the combining image and spectrum. It has been applied to all aspects of the earth sciences, as a more advanced detection technology. Firstly, the author describes the imaging characteristics of hyperspectral imager, and then introduces engineering applications both in the aviation and aerospace. Finally, the author summarizes the latest development of hyperspectral imager according to the papers and research reports which published in major academic journals in domestic and foreign in recent years. ©, 2014, Science Press. All right reserved.


Wang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

In this paper, an optical fabrication process is introduced in detail, which is about achieving ultra-precision surface by iteration of ion beam figuring (IBF) and supersmooth polishing technology. Developed as a new technology to achieve supersmooth surface, Numerical controlled micro-jet polishing (MJP) technology is also introduced. 100mm-diameter fused silica is used as the sample. In the process, the surface is superpolished with MJP at first, then IBF is used to correct the figure, and finally MJP is applied again to finish iteration process. The path for IBF is raster scanning, and MJP processes in a spiral way. The figure and roughness of the surface are tested and analyzed with interferometer and atomic force microscope (AFM). The results indicate that ultra-precision optical surface is achieved by the iteration process with figure accuracy of 0.879nmrms, mid-spatial frequency and high-spatial frequency roughness of 0.119nmrms and 0.0726nmrms respectively. © 2012 SPIE.


Dai L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

This Paper discusses techniques for measurements power spectral density (PSD) of optical super-smooth surface using scanning white light interferometer (SWLI). Analyzing the key point of PSD measurement, how to reduce the noise level and the system error. Using different objectives to test surface and giving PSD distribution spatial frequency range from 1 to 1000 mm-1. Then it will be convenient to the roughness of certain spatial frequency range. Roughness of super smooth surface is nearly 0.5nm rms from 1 to 1000 mm -1. © 2012 SPIE.


Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu H.,Zhejiang University of Technology
Journal of Micro/Nanolithography, MEMS, and MOEMS | Year: 2010

The finite-difference time-domain (FDTD) method is used as rigorous electromagnetic analysis model to calculate the field for a diffractive microlens (DML). The FDTD is used for the entire solution rather than using a near- to far-field propagation method to obtain the far-field energy distribution; thus, all the results are vector based. We derived a formula to calculate the magnitude of electric field, which is time dependent and can be used to graphically show the light wave propagation and focusing process through a DML. Both the comparison and the integral methods are presented to obtain wave amplitude in full solution space,and the distribution of light energy behind a DML is illustrated based on the wave amplitude. The formula of diffractive efficiency of the DML is derived from a time-averaged Ponyting vector, which can indicate the propagation direction of light energy. Application of these formulations in the analysis of a DML example demonstrates the high accuracy and efficiency of our method. © 2010 Society of Photo-Optical Instrumentation Engineers.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Key Engineering Materials | Year: 2014

In diamond cutting of optical glasses, the magnitude of critical depth |of cut for brittle-ductile transition is an important factor affecting the machinability of the work material in terms of production rate and surface quality. In this work, scratching tests with increasing depths of cut were conducted on glass BK7 to evaluate the influence of the cutting fluid properties on the critical depth of cut. Boric acid solutions of different concentrations were selected as cutting fluids in the tests. The resulting scratches were examined utilizing a white light interferometer and the values of the critical depth of cut were determined based 011 the observations of the micro-morphology of the scratch surfaces produced. Experimental results indicated that compared with the process without cutting fluid action, the critical depth of cut in diamond cutting of glass BK7 can be increased by using boric acid solution as the cutting fluid.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Key Engineering Materials | Year: 2014

For the technology of diamond cutting of optical glass, the machinability of glass is poor, which hindering the practical application of this technology. In order to investigate and ameliorate the machinability of glass, and achieve optical parts with the satisfied surface quality and dimensional accuracy, this paper first conducted SF6 indentation experiment by Vickers microhardness instrument, and then the scratching tests with increasing depths of cut were conducted on glass SF6 to evaluate the influence of the cutting fluid properties on the machinability of glass. Based on this, turning tests were carried out, and the surface quality of SF6 was assessed based on the detections of the machined surfaces roughness. Experimental results indicated that compared with the process of dry cutting, the machinability of glass SF6 can be improved by using the cutting fluid.


Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu Y.,University of Chinese Academy of Sciences
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

The temperature distribution of space objects can reflect in-orbit state. Ground-based and long- focal length imaging of space objects in infrared band provides information from which temperature distribution maps can be determined. The methods of the traditional temperature estimation are often single-band radiance and dual-band color thermometry. Uncertainties in the imaging process will reduce the traditional single-band radiance and dual-band color thermometry forward calculation accuracy. Such uncertainties include target emissivity, atmospheric transmittance, the earth's heat radiation, etc. In this paper, multi-band Bayesian estimation function model relating the measured number of electrons was established, the true temperature of space target could be more accurately solved. The model provided an estimation theoretic framework for developing optimal estimators and calculating Cramer-Rao lower bounds. The Cramer-Rao bounds of target parameter estimation function was derived, which could predict the accuracy of solving of the temperature and emissivity. Finally, the simulation and analysis of the algorithm was performed.


Ren H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

Using high-resolution full frame area array CCD FTF5066M as aerial image sensor of the camera, its frame rate is generally not more than 1 fps, which can not meet the high frame rate applications. Firstly, the full frame area array CCDFTF5066M drive circuit was introduced in this paper, and it was also been improved. Using CCD four output amplifiers to output at the same time, the highest frame rate reached 3.4 fps. Secondly, the timing of the CCD driver, front-end processing circuit, DC bias circuit, interface circuit of the four outputs were designed. The improved driver circuit could meet the application requirements of various aerial camera. Then the full frame area array CCDFTF5066M non- uniformity was analyzed, and a non-uniform response detection system was established. Using this system, the array CCD5066M's non-uniformity between the four quadrants and each pixel was tested separately. On the basis of CCD linear responsivity, two correction algorithm was proposed to correct the non-uniformity. At last, by correcting, the four quadrants's standard deviation of response sensitivity was reduced to the original's 1/13. Through the re-shoting of the identify rate board, it can seen that the array CCD's non-uniformity has been improved obviously.


Liang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

For the purpose of fabricating high-quality mesh in a deep concave spherical substrate by laser direct writing technique, the constant exposure dose control must be realized during the whole scanning process. Firstly, the principle of the equipment for fabricating mesh in a deep concave spherical substrate via laser direct writing technique was introduced. Then scanning motion states for writing arbitrary line of latitude were analyzed, and the formulas that expresses the mathematical relationships between the dimensions of the substrate, parameters of mesh and the scanning velocity were deduced. The mathematical model of scanning with constant exposure dose was built, and the servo control system including software and hardware was developed according to the mathematical model. The servo control system could tune the scanning angular velocity precisely according to the latitude of lines to maintain the linear velocity invariantly, so as to keep the exposure dose constant and improve the quality of lines. So far, constant exposure dose control was realized finally. Mesh with 500 μm gridding period was fabricated in a deep concave spherical substrate with a rise-span ratio of 0.31. Lines on the substrate have good uniformity, steep and straight side walls parallel to each other after development, and errors of line width and gridding period are within ±1% and ±5%, respectively.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

In order to obtain the figure error of the whole large convex aspherical mirror, a new method for testing large convex asphere by subaperture stitching and interferometry so called SSI was proposed. A perfect sphere mirror was used as the reference surface, the phase distribution of each subaperture could be measured by the digital wavefront interferometer, and the full surface map could be calculated by stitching several subapertures. The basic principle and theory of SSI were studied, the stitching process and prototype for test of large aspheres were devised and developed, and the setup of SSI for measuring of large aspherical surface was designed and manufactured. A convex SiC asphere mirror with the aperture of 260 mm was tested by SSI with 9 subapertures. For the validation, the aspheric mirror was also measured by null compensation, the difference of PV and RMS error was 0.043 λ and 0.021 λ, respectively (λ is 632.8 nm). It provides an another accurate testing method for aspherical surface especially for large convex aspherical mirror.


Su W.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of 2nd International Conference on Information Technology and Electronic Commerce, ICITEC 2014 | Year: 2014

H∞ filtering is a representative method of robust control. In the SINS/GPS integrated navigation system, to solve the limitation of Kalman in the system model and noise, this paper puts forward an application of H∞ filtering algorithm, which has strong robust performance in integrated navigation system. The filter equation of H∞ and Kalman algorithm is given. The integrated navigation (SINS/GPS) uses the output difference between SINS and GPS as input value of the filter, and then the error of integrated navigation system is estimated and corrected by one filtering method in real time. The accuracy and robustness are analyzed and compared between the two kinds of filtering algorithm. The simulation result shows that the H∞ filtering has better stability and robustness in colored noise. Through this research, H∞ filtering algorithm can well solve the uncertainty of the noise model and statistical characteristics. H∞ filtering algorithm is more suitable for the application of SINS/GPS to integrated navigation system. © 2014 IEEE.


Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Nanomaterials | Year: 2014

A dual scanning laser speckle interferometry experiment was designed to observe the dynamic behavior of the magnetic fluid actuated by a magnetic field. In order to improve the spatial resolution of the dynamic speckle measurement, the phase delay scanning was used to compensate the additional phase variation which was caused by the transverse scanning. The correlation coefficients corresponding to the temporal dynamic speckle patterns within the same time interval scattering from the nanoparticles were calculated in the experiment on nanoscale magnetic clusters. In the experiment, the speckle of the magnetic nanoparticle fluid movement has been recorded by the lens unmounted CCD within the interferometry strips, although the speckle led to the distinguished annihilation of the light coherence. The results have showed that the nanoparticle fluid dynamic properties appeared synergistically in the fringe speckles. The analyses of the nanoparticle's relative speed and the speckle pattern moving amount in the fringes have proved the nanoparticle's movement in a laminar flow in the experiment. © 2014 Xijun Wang.


Sun P.,Jilin University | Zhou X.,Jilin University | Wang C.,Jilin University | Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

The hierarchical undoped and Cd-doped SnO2 nanostructures had been synthesized via a low-cost and environmentally friendly hydrothermal route. The morphology and structure of the as-prepared product were characterized by X-ray diffraction (XRD), field-emission electron microscopy (FESEM), and transmission electron microscopy (TEM). The images of field-emission electron microscopy and transmission electron microscopy showed that pure and Cd-doped SnO2 hierarchical architectures were built from one-dimensional nanorods. X-ray diffraction (XRD) of the doped samples revealed that Cd incorporation led to lattice deformation without destroying the original crystal structure. Gas sensors based on undoped and Cd-doped SnO2 nanorods were fabricated, and their gas sensing properties were tested for various gases. The 3.0 wt% Cd-doped SnO2 based sensor showed excellent selectivity toward H2S at the operating temperature 275 C, giving a response of about 31-10 ppm, which was about 22 times higher than that of sensor based on pure SnO2. © 2013 Elsevier B.V.


Wang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

To lighten the weight of a lunar-based Extreme Ultraviolet (EUV) camera and to ensure the function of the collimation frame structure of the EUV camera under the conditions of the large level vibration caused by satellite launching, earth-moon orbit transfer, moon landing and the large temperature difference on the lunar surface, a collimation frame structure based on Carbon Fiber Reinforced Plastics (CFRP) is designed. Firstly, different collimation frames are designed based on metal materials and the CFRP, and the superiority of the collimation frame based on the CFRP is verified by finite element analysis. Finally, the experiments on temperatures and mechanics are performed, and the experiment results show that CFRP collimation frame has a lighter weight and its stiffness and thermal stability meet the requirements of environmental adaptation.


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2011

A low-cost, broadband, astigmatism-corrected Czerny-Turner arrangement with a fixed plane grating is proposed. A wedge cylindrical lens is used to correct astigmatism over a broadband spectral range. The principle and method of astigmatism correction are described in detail. We compare the performance of this modified Czerny-Turner arrangement with that of the traditional Czerny-Turner arrangement by using a practical Czerny-Turner imaging spectrometer example. © 2011 Optical Society of America.


Zheng N.,Chinese Academy of Sciences | Liu J.,Chinese Academy of Sciences | Wang Q.,Chinese Academy of Sciences | Liang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Science of the Total Environment | Year: 2010

Heavy metal contamination in the street dust due to metal smelting in the industrial district of Huludao city was investigated. Spatial distribution of Hg, Pb, Cd, Zn and Cu in the street dust was elucidated. Meanwhile, noncancer effect and cancer effect of children and adults due to exposure to the street dust were estimated. The maximum Hg, Pb, Cd, Zn and Cu contents in the street dust are 5.212, 3903, 726.2, 79,869, and 1532 mg kg- 1, and respectively 141, 181, 6724, 1257 and 77.4 times as high as the background values in soil. The trends for Hg, Pb, Cd, Zn and Cu are similar with higher concentrations trending Huludao zinc plant (HZP). The exponential equation fits quite well for the variations of Pb, Cd, Zn and Cu contents with distance from the pollution sources, but not for Hg. The biggest contribution to street dust is atmospheric deposition due to metal smelting, but traffic density makes slight contribution to heavy metal contamination. According to the calculation on Hazard Index (HI), in the case of noncancer effect, the ingestion of dust particles of children and adults in Huludao city appears to be the route of exposure to street dust that results in a higher risk for heavy metals, followed by dermal contact. The inhalation of resuspended particles through the mouth and nose is almost negligible. The inhalation of Hg vapour as the fourth exposure pathway to street dust is accounting for the main exposure. Children are experiencing the potential health risk due to HI for Pb larger than safe level (1) and Cd close to 1. Besides, cancer risk of Cd due to inhalation exposure is low. © 2009 Elsevier B.V. All rights reserved.


Li Z.,CAS Changchun Institute of Applied Chemistry | Zheng M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan X.,CAS Changchun Institute of Applied Chemistry | Guan X.,Beihua University | And 3 more authors.
Nanoscale | Year: 2014

Purely organic nanoparticles based on a BODIPY dimer, BDY-NPs, have been prepared for the first time using a nanoprecipitation procedure. The fluorescent nanoparticles have high physical homogeneity, good stability in water, and low cytotoxicity, which are suitable for cell imaging. © 2014 the Partner Organisations.


Chen Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2014

In this paper, the performance comparison between glass ceramics (Zerodur) and silicon carbide (SiC) which are two kinds of common materials used for space optical reflector is carried out, and several lightweight structure forms are analyzed. The oval plane reflector is applied in ultra-low temperature environment of space, take this kind of reflector as an example, its lightweight structure is optimized by CAD, then through finite element analysis, deformation of the planar lightweight mirror is 0.014λ (rms) in gravity condition, and deformation is 0.002λ (rms) in ultra-low temperature of-150 degrees environment. The actual lightweight processing is controled by the CNC system in a graphical way, and using chemical method to eliminate the stress and micro crack generated during processing, its final surface shape precision reaches 0.022λ (rms). Finally, this paper introduces the manufacture method of novel silicon carbide (SiC), and analyzes the current situation and development trends of the spatial lightweight reflector manufacturing technology. © (2014) Trans Tech Publications, Switzerland.


Zhang T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
2013 IEEE 3rd International Conference on Information Science and Technology, ICIST 2013 | Year: 2013

By using finite element simulation software of Patran and MD. Nastran we simulate the mechanical property of optics cabin of missile. The element analysis includes static mechanical and thermal analysis of cabin wall which can simulate the condition as missile flying, modal analysis and overloading analysis for optics system support which reflect the dynamics capability, we obtain distribution of stress and temperature of cabin and top ten natural frequencies. The result of simulation is important reference for structure estimate and optimal design. © 2013 IEEE.


Wang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2013

The data communication system is the internal data exchange platform of theodolite, which completes data exchange among multiple subsystems. According to requirement of proving range to target attitude measurement, the rate of real time target image storage is quicker and quicker, as the synchronous measurement information deliverer, the communication frame frequency of data communication is also increasing. Adopting time pre-processing method resolves the problem that B code terminal cannot provide high frame frequency time information, The utilization of ARM processor built in watchdog counter function and configuration of external interruption signal can realize the precise time sequence control, and realize the synchronous transmission of measured data in case of high frame frequency, and the software realization method is provided. © (2013) Trans Tech Publications, Switzerland.


Wan-Xin S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
2014 11th International Computer Conference on Wavelet Active Media Technology and Information Processing, ICCWAMTIP 2014 | Year: 2014

When the system model and noise statistical characteristics are known, the conventional Kalman filtering algorithm is suitable. In most cases, the noise statistics are unknown. To improve the alignment precision and convergence speed of strap-down inertial navigation system, an initial alignment method based on Sage-Husa adaptive filter is proposed. Automatic on-line estimation and correction for the noise parameters, the state of the system and the state estimate covariance by the observed data. Using forgetting factor can limit memory length of the filter, which could enhance the effect the newly observed data acts on the present estimation. Thus, enable the system to achieve the best filtering effect. Through simulation verifiable, the adaptive Kalman filter algorithm, improve the convergence speed and alignment accuracy effectively. © 2014 IEEE.


Lu X.,Jiangxi Normal University | Xiao X.,Jiangxi Normal University | Li Z.,CAS Changchun Institute of Applied Chemistry | Xu F.,Jiangxi Normal University | And 3 more authors.
Analytical Methods | Year: 2014

A novel nonenzymatic hydrogen peroxide (H2O2) sensor was simply prepared by depositing Pt nanoparticles (Pt NPs) onto Ni foam using UV-irradiation. Scanning electron microscopy was applied to characterize the changes of morphologies with UV-irradiation time. Energy dispersive spectroscopy confirmed that the Pt NP-Ni foam was mainly composed of Pt and Ni. The Pt NP-Ni foam electrode shared the unique advantages of Pt NPs (such as the good electrocatalytic activity) and Ni foam (such as the high electric conductivity, large surface area and high porosity). Its application in H2O 2 detection, surprisingly, showed the high sensitivity and low detection limit. The linear range was from 0.005 to 0.85 mM. The sensitivity was 829 μA cm-2 mM-1 and the detection limit was 0.3 μM (S/N = 3). The H2O2 sensor also showed long-term stability. Therefore, the sensor is more suitable for the detection of H 2O2 concentration. © 2014 The Royal Society of Chemistry.


Liu Y.,Zhejiang University of Technology | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
IEEE Photonics Technology Letters | Year: 2012

We find strong intensity modulations in surface plasmon polaritons (SPPs) by changing the refractive index and thickness (i.e., the optical length) of the dielectric layer in metal-dielectric nanodevices. We interpret the phenomena by considering the dielectric layer as a Fabry-Pérot cavity. Analysis from finite-difference time-domain numerical studies reveals that the strong periodic variation of the enhancement in SPP fields is due to alternating constructive and destructive interference of optical waves in the dielectric layer. The present results can be applied in designing planar metal-dielectric nanodevices that require optical intensity modulation or high-field enhancement, such as optical switches or thin-film solar cells. © 2012 IEEE.


Zhang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A computer-controlled Chemical Mechanical Polishing(CMP) technology was presented to polish a silicon modification layer on the aspheric silicon carbide (SiC) surface in high precise and efficiency to achieve a high quality aspheric SiC mirror. The polishing theory of CMP for the silicon modification layer on aspheric SiC surface was studied. Then, the principle of computer-controlled CMP for manufacturing a surface modification aspheric SiC mirror was described. With comparing the computer-controlled CMP and ordinary computer-controlled polishing, the superiority of computer-controlled CMP was explained. Furthermore, on the basis of experiments, the material removal function of computer-controlled CMP was studied. Finally, a Φ120 mm surface modification aspheric silicon carbide mirror was polished by computer-controlled CMP technology according to the material removal function. The initial figure error of the mirror is 0.253λ(RMS) (λ=0.6328 μm). After about ten polishing iterations, the final figure error and roughness of the mirror are 0.014λ (RMS) and 0.5387 nm (RMS), respectively, which can satisfy the desired optical performance.


Chen Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2016

As the performance of a scanning interference field lithographic system using static three-step splicing exposure method is related to the positioning accuracy and stability, this paper designs a 2D positioning stage with a large stroke to achieve high positioning accuracy. The friction drive and piezoelectric ceramic micro displacement mechanism were combined to form a macro-micro feed mechanism. A closed gas hydrostatic guideway was used to drive the stage to implement the raster indexing and scanning movement along X, Y directions. The friction driving mechanism and aerostatic bearing structure were optimally designed in detail, and the natural frequency of overall structure of the stage was calculated by finite element analysis. An autocollimator was used to test the linearity of the guideways in X, Y directions, and results show that yaw and pitch accuracy in both directions are within ±0.04 μm. A laser interferometer was taken to detect the positioning accuracy and positioning noise of the guideway in X direction and the result shows that for the stage with a stroke of 220 mm in X direction and 300 mm in Y direction, the positioning accuracy of X direction is better than ±5 nm, and the positional stability is better than ±25 nm, meeting the requirements of scanning interference field exposure system stage for nanometer positioning precision. © 2016, Science Press. All right reserved.


Liu D.,CAS Changchun Institute of Applied Chemistry | Liu D.,University of Chinese Academy of Sciences | Zhang X.,CAS Changchun Institute of Applied Chemistry | Zhang X.,University of Chinese Academy of Sciences | And 2 more authors.
Nanoscale | Year: 2013

Free-standing nitrogen-doped carbon nanofiber (NCNF) films based on polyacrylonitrile (PAN) were prepared simply by the combination of electrospinning and thermal treatment. We reused the nitrogen-rich gas generated as the byproduct of PAN at elevated temperature, mainly NH3, for surface etching and nitrogen doping. The as-obtained NCNFs exhibited a rougher surface and smaller diameter than pristine carbon nanofibers. Despite the decreased total N content, a significant increase in the content of pyrrolic-N was observed for the NCNFs. In application to electrochemistry, the free-standing NCNF films showed comparable catalytic activity with a close four-electron pathway to a commercial Pt/C catalyst in alkaline medium toward oxygen reduction reaction (ORR), which can be attributed to the nitrogen doping and high hydrophilicity. More importantly, the ORR current density on the NCNFs only dropped 6.6% after 10000 s of continuous operation, suggesting an enhanced long-time durability. In addition, the NCNFs also showed better electrocatalytic selectivity than Pt/C. Our work reveals a facile but efficient approach for the synthesis of free-standing NCNF films as a promising alternative to Pt-based electrocatalysts in fuel cells. © The Royal Society of Chemistry 2013.


Wang T.-T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The gratings were fabricated by hologram-ion beam etching technique on the silicon carbide substrate that has fine stiffness and thermal stability. The intrinsic defects of the silicon carbide leads to a rough surface of the grating grooves, the roughness of the bottom and the top of the grating grooves are 29.6 nm and 65.3 nm (Rq), respectively. A uniform silicon coating were deposited by Plasma Ion Assisted Deposition (PIAD) technique on the surface of the silicon carbide substrate, then a super smooth surface was obtained after fine polishing. Characterized by XRD, we found the silicon coating is amorphous. After fine polishing, the surface roughness of the silicon carbide is 0.64 nm(Rq) measuring by AFM. The roughness of the grating grooves are significantly decreased, the roughness of the bottom and the top of the grating grooves are 2.96 nm and 7.21 nm(Rq), respectively. Comparing with the grating grooves before surface modification, the roughness of the bottom and the top are 1/10 and 1/9, respectively.


Shen Z.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

A material with specific refractive index is prepared according to the requirement for the preparation of the laser protective coating for solar arrays. In this method, we apply the electron beam co-evaporation technique based on doped material preparation methods. Tests show that the refractive index of the doped material is 1.75, according with the result of optimized scheme. The material is then used in the preparation of optical thin films to achieve a further optimization of the laser protective coating properties. Obtained laser protective coating has excellent properties and its solar radiation transmittance is increased by more than 6%. The film thickness mask technology is applied to improve the film thickness uniformity of large area thin films prepared by co-evaporation method. The thickness nonuniformity of doped material film prepared by this method within Φ400 mm area is less than 2.1%. It is showed that the technical process of electron beam co-evaporation technique is simple, reliable and suitable for practical applications. Test results of the film performance are consistent with the theoretical optimized results.


Liang M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

This paper puts forward an improved adaptive three sections linear infrared image enhancement algorithms, based on the image histogram to determine the segmentation threshold; We design a image processing hardware platform based on DM642: through FULL Camera Link interface to get images, the image processing unit to complete image enhancement algorithms, the system export the enhanced image with SDI format; The experiments show that the system can realize the real-time image enhancement processing functions, handling frame frequency can reach 25Hz, the enhanced image stresses the details of the image edge area while suppressing the background, increases the details of the improved contrast, and satisfy the requirement of the image visual effect, achieve the satisfactory result.


Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

Automatic transmission system contains parts in different domains, such as mechanical, hydraulic and control, and is difficult to simulate in whole by conventional simulation methods. MWorks platform is presented in this paper, using the Modelica language, car automatic shift system model is established, and simulation test. Through the analysis of simulation results, the vehicle and shift time to choose the best gear, the car has good power performance and fuel economy. This model is based on established multidisciplinary modeling language, unified modeling of the multidisciplinary complex system can be implemented, the automatic shift system overall design and performance analysis provides a new effective method.


Sun H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

Airborne electro-optical (EO) platform uses the known GPS location of a target, with the measurements of aircraft position and attitude, calculates target guidance angles including azimuth and elevation. The guidance angles may be used to control imaging system points the target and further keeps it in the center of optical view field of imaging system. In this paper, the coordinate transformation model from geodetic coordinate system to imaging system was established by using linear coordinate transformation, and the computation formula of azimuth and elevation for target guidance has derived based on the transformation of different coordinates. The influence of target guidance due to various error factors was discussed, and the guidance error analysis with Mont Carlo method was presented. The experimental result shows that the target guidance is affected by aircraft position errors, aircraft attitude errors and target position errors. The aircraft attitude errors same scale to the target guidance error, but the aircraft position errors and the target position errors scale up with the range of to the target guidance errors. This method is efficient and will be useful to target guidance for airborne EO platform.


Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

In order to solve the problem of moving target tracking in complex background, especially the continuous and robust target tracking under occlusion condition, a target tracking algorithm based on decision-leading and multi-pattern fusion is proposed. The multilayer algorithm structure is adopted, and image feature is taken as the decision-making criteria, so the algorithm procedure can be self-controlled. Firstly, centroid and improved particle filter algorithm are used to predict the target position and coarsely locate the target; then, the improved SIFT feature matching pair is adopted to precisely locate the target. Besides ensuring the tracking performance, the proposed method greatly simplifies the algorithm complexity, and improves its real-time performance. Experiment results indicate that with multi-pattern fusion, the proposed algorithm can accurately extract, and continuously and robustly track the target in the conditions of target rotation, scaling and occlusion. The proposed algorithm can fulfill the requirements of real-time and robustness in engineering applications.


Chen X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

This paper presents a simulation for the evaluation system of the tracker that be used in light-electric measuring system, combined with the virtual simulation technology and the field real scene video material, make the simulation results closer to the test site. Based on computer video output card form and optical form completely analog camera output video stream injection, the output of the simulation results of video data, no need to change equipment video data input interface to be measured. Based on the simulated data and the measured value of comprehensive treatment device feedback data, realize the quantitative assessment of the measured performance of the equipment, the equipment performance evaluation measured with quantitative data, improve the field adaptive optical equipment, reduce the cost of outfield test.


Wu C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

Optical electronic imaging system is widely used in battlefield assessment, forest fire preventing, road monitoring, etc. This paper proposes a optical electronic imaging system based on multiple-sensor. Multi-sensors use common optical route in this the system. It means to get the same scene in same time. In order to extend the transmission distance, reducing the complexity of the wiring, the system uses network transmission image. In order to improve color image quality, the system uses different spectral image fusion method in the low illumination conditions. The experiment shows that the application of fusion method for color image quality is better than the source color image.


Wang X.-K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

For the purpose to decrease the misalignment error from a testing aspheric surface by Subaperture Stitching Interferometry(SSI), a translated error compensation method is proposed to subtract the misalignment error from each phase detum and to stitch multi-subapertures precisely. The basic principle and process of the method are researched, and a compensation mode is established based on the mode search algorithm. The experiment is carried on for an off-axis SiC aspheric mirror with a clear aperture of 230 mm×141 mm, the phase data of the whole aperture are stitched precisely and the figure error is compensated by eliminating the misalignment error. For the comparison and validation, the asphere mirror is also tested by null compensation method, and the relative errors of PV and RMS are 0.57% and 2.74%, respectively.


Liu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

The main background is sky in tracking flying object. Usual the target is dim target. The background noise interferes the tracking badly. The correlation tracking algorithm based on target feature is commonly used. But use single target feature cannot track the target robustly. A multi-feature amalgamation target tracking algorithm is presented. Multi features are amalgamated by self-adapt. The other features are used to keep tracking when some feature changed. The most similar area found in current image frame with tracked target model is considered as the target position. The algorithm is applied in projects, and the experiment results show that the algorithm has better tracking effects when target grayscale changed or similar target interfered the tracking.


Shi G.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

This paper attempts to look for a new method to obtain a square spot whose brightness distribution is homogeneous and the value of BPP is equal in two directions. Moreover, a spherical spot may be obtained too, if it is coupled with a fiber. The method only adopts the cylindrical and the spherical lenses and no other kinds of micro optical elements unlike the methods in foreign countries. An exit pupil of the system is taken as a spot to solve the problem of brightness homogeneous distribution, and the spacing influence of the light sources upon the value of BPP is clean up to decrease the value of BPP of the slow axis. Furthermore, the characteristic of the point light source is utilized to allow the BPP values of the fast axis and the slow axis to be equaled. Finally, this new method is used to design the coupling optical systems with different demands and specifications. The design example in this paper shows that there are 19 light sources at a bar, and the number of the bars is 21, then the total number of the light sources is 399. The size of the square spot obtained is 0.6 mm×0.6 mm and NA is 0.22. The spherical spot can be obtained if the system is coupled with the fiber with a diameter of 1 mm. Compared to the foreign methods, the construction of the new method is simpler and the demand for crafts is lower. The new method is suitable for the semiconductor lasers with high power and low values of BPP.


Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

This paper introduces a comprehensive parametric test system for high power lasers. The system can test high power single-tube lasers of wavelength 400-1100 nm range, operating current 0-15A (CW/QCW), power 1-15W (continuous/peak). It can acquire optical parameters and electrical parameters including V-I curve, P-I curve, optical power, the threshold value, the efficiency of the differential resistance, spectral, the far field, thermal resistance and other parameters, as well as electrical derivative curves and electrical derivative parameters. The system can not only measure the conventional parameters of semiconductor lasers, but also can be used on device reliability evaluation according to electrical derivative curves and electrical derivative parameters. The system can be widely used in high-power semiconductor laser research and development units, application units as well as third-party testing agencies.


Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

In order to meet the application demand of laser rangefinder, laser fuze and so on, we carry out theoretical and experimental research on high-power narrow pulse vertical cavity surface emitting laser (VCSEL), developed a kind of high peak power of single chip VCSEL devices based on the structure of multiple quantum well active region. The peak light power of the VCSEL device is more than 50W with the efficiency higher than 35%. Moreover, the drive curcuit of the VCSEL device is also developed. The VCSEL device is realized with integrated driving circuit, miniaturization integration, with its peak current up to 100A, pulse width of less than 50ns, repetition frequency of 1 kHz-10 kHz. It can meet the application field of laser rangefinder, laser imaging, laser-guided and so on.


Song Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

Car reversing aid system is an electronic intelligent monitoring system, which is able to detect the distance between barrier and car and output steering angle prompt while parking and reversing. This thesis has a deep discussion and research on application of car reversing aid system base on CAN bus. There are four models of this system, including ultrasonic distance detector, distance detecting controller, main controller and display. Distance detecting controller exchanges data with ultrasonic distance detector through RS232 serial ports and transfers barrier distance information to main controller constantly. Main controller combines distance information from all ultrasonic distance detectors to work out car steering angle using fuzzy control algorithm. we test the car reversing aid system base on hardware and get conclusion that CAN bus web is stable, safety and constant. Car reversing aid system can supply validity operation indication. The performance of this system can satisfy design target.


Sun H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

On the basis of the characteristics of an airborne electro-optical platform, six coordinate systems were established and eight linear coordinate transformations were performed. A coordinate transformation model from a camera sensor plane to geodetic coordinate systems was established by using linear coordinate transformation, and the computation formula of geodetic coordinate of the target was derived based on the transformation of different coordinates. The influence of target localization due to various error factors was discussed, and the localization error was analyzed with Mont Carlo method. The experimental results show that the target location is affected by aircraft position errors, aircraft attitude errors and EO platform pose errors, among which the aircraft position errors are transferred directly into the target location, and the aircraft attitude errors and EO platform pose errors are tranferred scaling with the range of 10-4~10-2 to the target location. This method is efficient and useful to the localization of targets for airborne EO platforms.


Xuan B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2013

The birefringence of transmission flat/sphere and other components introduces measurement error in Polarization Phase Shifting Interferometry (PPSI). Based on the principle of PPSI, the measurement error was analyzed by using the Jonse maxtrix formulations. It was found that the birefringence generated eight beams interference on the CCD, and the measurement error was a function of the ratio of amplitude of test beam and reference beam, the testing cavity phase, the amount and orientation of birefringence. The measurement error varied 2 periods in every fringe. The maximal PV of measurement error would be 4 times of birefringence and the measurement error would be compressed if the orientation of birefringence was consistent. When the birefringence was of the same orientation, the measurement error could be eliminated. A ∅12 inches material was analyzed. The results show that the birefringence of the ∅4 inches area in the center was 18 nm, which introduced the measurement error of 72 nm (PV). The birefringence of the material at the edge was 22 nm and the measurement error was 24.9 nm (PV) because of the consistence of birefringence orientation.


Zhang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The method to get high-orbit satellite basic information such as geometry and material characteristic, is an important goal in the field of space posture apperception. In this paper, we calculate the satellite magnitude by comparing the output value of camera's CCD between the known fixed star and the satellite. We select certain reference stars to calculate the luminance value of a certain object on the acquired image using a background-removing method. We make time-domain analysis of the measurement data, and get the statistic result. With the knowledge of the theory brightness of the target, we estimate the geometric characteristics of the target. We have got a serious of the images of a certain satellite on large telescope. The experimental results demonstrate that, the accuracy of the measured magnitude is better than 0.12Mv, and the estimation error of the target reflection surface size is less than 15%. © Copyright 2015 SPIE.


Shao S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

The sensitivity of infrared system decreases because of external stay light heat radiation and internal heat radiation. For one type of infrared system, the detailed design of the optical system, themechanical structure and heat radiation is presented according to the technical specifications. The aperture of optical system is 1000 mm. The aperture of the optical structure for visible light, mid-infrared light and long-infrared light is shared. The visual resolution is 690 lp/mm. The focus lengths of visible, mid-infrared and long-infrared light are all 2000 mm, The adjustment of pitching and azimuth for the image head components is realized through the 2-dimensional rotation structure of horizon type to guarantee aiming and tracking the target. The internal stay light radiation is analyzed, including the influence of received radiation energy of image by the different surface emissivity and temperature in the mechanical internal surface. The water-cooling cycle system is designed to reduce the temperature of optical-mechanical system for decreasing internal stray light radiation. The test results show that the focus length of visible light and visual resolution meet the design requirement. The focus length of each infrared subsystem all reaches the design value. The contrast of recording image is clear.


Wang R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

A compound guided system by combining the laser 3D active imaging and passive IR imaging was proposed to improve the operational effectiveness for air-ground missiles and the recognition ability for IR stealthy targets. The detail design program and reasonable guided strategy were also given. This system has the ability of IR wide field searching and laser 3D imaging in a narrow field and its abundant image information makes the operational object recognition more easy. The structure of the whole system is simple and easy to process. When the aperture of the compound guided system is limited at about 100 mm, the guided distance is longer than 4 km. This technology is important to develop compound guided systems and improve the missile operational ability in our country.


Li D.,Jilin University | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang H.,Jilin University | Wang Y.,Jilin University
Chemical Society Reviews | Year: 2013

Four-coordinate organoboron compounds with rigid π-conjugated structures are intensely luminescent and have high carrier mobility which enables them to be applied in optoelectronics including organic light-emitting diodes (OLEDs), organic field-effect transistors, as well as photoresponsive, sensory and imaging materials. Various chelate ligands and boron moieties have been explored to construct proper electronic structures and suitable molecular arrangements, which play important roles on the photophysical and electronic properties of the four coordinate boron compounds. These efforts have produced a number of fascinating molecules, some of which have exhibited high performance as light emitting materials. In this article, we provide an overview of the progress in the molecular construction of four-coordinate organoboron compounds with an emphasis on their applications in OLEDs. This journal is © The Royal Society of Chemistry 2013.


Yan F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

The invariance of modulation transfer function (MTF invariance) is defined to be the evaluating criterion of the wavefront coding system. The rapid optimization of wavefront coding system based on the MTF invariance is proposed by means of introducing the mathematical program to normal optical design process. The interface called dynamic data exchange (DDE) interface, between mathematical program and optical design program is applied to realize the fast data exchanging and merit function calculating. The MTF invariance of the optimized system decreases to 0.0119, compared with 0.0187 of the original system. Results show that the optimization of special optical systems can be executed more conveniently and fleetly with the help of external program and dynamic data exchange.


Li Z.,Jilin University | Cao J.,Jilin University | Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao X.,Jilin University | Liu W.,Jilin University
Optics Communications | Year: 2014

As we know that deformable-mirror (DM) is used in the adaptive optics (AO) systems to compensate atmospheric turbulence in free space optical (FSO) communication system. In order to get rid of the limitations generated by the characters of DM itself, the combinational-deformable-mirror (CDM) adaptive optics (CDM-AO) system is established to correct wave-front aberrations and improve coupling efficiency at the receiver. The analysis of the principle of CDM and the decoupling-working principle based on confinement correction algorithm (CCA) is provided, and the comparison of the correcting results between CDM-AO system and conventional AO system are given. Simulation results indicate that CDM-AO system can correct different aberrations with different characteristics and provide better correction performance than single deformable-mirror (DM) AO system. And the coupling efficiency improvement provided by the correction of AO system is numerically evaluated. © 2014 Elsevier B.V.


Tan X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

In ultraviolet spectroscopy, there is a constant need to improve the diffraction efficiency. A blazed grating can concentrate most of the light intensity into a desired diffraction order, so it is the optimum choice among gratings of different kinds of profile. As the operating wavelength of most UV spectral applications is less than 200 nm, the required blaze angle is small; groove irregularity and surface roughness of nanometer magnitude can cause a significant loss of diffraction efficiency. Therefore, it is important to control the groove shape precisely , especially the blaze angle and the apical angle. We have presented a direct shaping method to fabricate EUV blazed gratings by using an ion-beam mixture of Ar+ and CHF2+to etch K9 glass with a rectangular photoresist mask. With this method, we have succeeded in fabricating well-shaped UV blazed gratings with a 1200 line/mm groove density and 8.54° blaze angles and 1200 line/mm groove density and 11.68° blaze angles, and the metrical efficiency is about 81% and 78%. The good performance of the gratings was verified by diffraction efficiency measurements. When one uses the etching model, the conditions on the ion-beam grazing incident angle and the CHF3partial pressure should be noted. Besides, since the etched groove shape depends on the aspect ratio of the photoresist mask ridge, if we wish to fabricate larger gratings with this method, we must improve the uniformity of the photoresist mask before ion-beam etching. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).


Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

Tracking accuracy and other technical criteria increasing leads to improving of alignment and detecting technology in optical system photoelectric theodolite. A new method of alignment and detecting for photoelectric theodolite main mirror, including assembling, adjustment, coating, axis detection and checking was introduced in this paper. Then, ZYGO interferometer was used in main mirror detecting, this method toke the place of traditional detecting method. Ultimately, ZYGO interferometer technology got clear image both from aviation aircraft 70-80 km away and target in the distant of 5000 m according to the field experiments. The main mirror meets accuracy of designing and alignment. So the application of interferometer in photoelectric theodolite primary mirror enhances the alignment accuracy.


Zhou C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

With the development of IR technology, more and more IR instruments were used on large telescopes. A cryogenic circumstance was necessary for IR instruments operation, this sets many technical challenges for opto-mechanical design. Optical parts need accurate mounting and positioning, meanwhile they must not be cracked or breaked by thermal stresses during cryogenic. In order to solve this problem, the kinematic mount theory was presented, detailed mechanical design for all reflecting mirrors, lens, filter wheels used in optical systems were proceeded and kinematic mount was realized by these designs. The conflict between firmly fixing the optics and preventing stresses within the optics during cooling was well settled via these kinematic mount designs. Optical system security and imaging quality during cooling were well ensured by these kinematic mount designs. The research results have important referential valve for mechanical and thermal design for IR optics system.


Ren H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

The internal structure and work patterns of the surface array CCD485, were described and the basic drive circuit design was given. And then through the array CCD485 drive timing diagram analysis, based on the timing segments and the general purpose of the finite state machinetype full frame area array CCD drive timing generator, the grouping method by the CCD drive timing, the timing waveforms of each group was divided into a number of basic output state, so that the drive timing of the CCD for each session canby combination of the basic state, and Moore finite state machine to describe the timing-driven modular design. The specific design of each module was given, the timing generator of the design process easier, and finally using Xilinx Virtex-II Pro series FPGA-XC2VP20 and Xilinx's ISE software platform, CCD drive timing generator was designed, and simulation waveform analysis was completed. The output meet the timing requirements of 485-chip driver, the effectiveness of the design method is proven.


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Communications | Year: 2013

A broadband, aberration-corrected Dyson arrangement with an aspheric grating surface is proposed. An aspheric grating surface is used to correct spherical aberration resulted from the air gap between the focal plane and the rear surface of Dyson lens. The principle and the method of aberration correction are described in detail. We compare the performance of this modified Dyson arrangement with that of the Dyson arrangement using a spherical grating surface by using a practical Dyson imaging spectrometer example. © 2013 Elsevier B.V.


Zhang T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Journal of Liquid Crystals and Displays | Year: 2016

A measurement method for real-time adjusting integer time of infrared camera is proposed. Since the image of target is a point and the gray value is verified severely, the relationship between light and gray values in different integer times is calibrated for the precision of radiation measurement and the linear curve of response is fitted. Then the algorithm for the diffuse image spot of target in the detector is proposed. Furthermore, the size and central position of the target are estimated accurately by matching the simulated image and the actual image obtained from the IR imaging system. The total gray value is got and the integer time is adjusted based on the relationship between light and gray value. The experiment result shows that the integer time of two different cameras is adjusted, the gray value is in the linear region and the frequency is 25 Hz and the real-time request in the high speed air vehicle is met. © 2016, Science Press. All rights reserved.


Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2016

Because diffractive optical element can shape Gaussian beam, it is attached great importance. The conventional design methods such as G-S algorithm tend to need a large amount of calculation and a long time, while Hankel transformation can increase calculation speed and save time. We successfully designed a binary refractive and diffractive optical element applying Hankel transformation into G-S algorithm. When the diffractive optical element was placed at the waist of the laser beam with the wavelength of 775 nm and the waist diameter of 6 cm, a uniform spot could be gotten at the detector plane 35 cm behind it. Its radius was 200 μm and root-mean-square error was smaller than 0.021. The calculation time was only 20.05 s with PC, saving much time during the process of optimization, in which hundreds of calculation were needed. We fabricated the refractive and diffractive optical element by ion beam etching, and tested it in lab. The experiment results agreed well with the caculation. This kind of element not only can get good spot, but also is suitable of integration with laser. © 2016, China Science Publishing & Media LTD. All right reserved.


Deng Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Korvink J.G.,Institute of Microstructure Technology
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2016

This paper develops a topology optimization procedure for three-dimensional electromagnetic waves with an edge element-based finite-element method. In contrast to the two-dimensional case, three-dimensional electromagnetic waves must include an additional divergence-free condition for the field variables. The edge element-based finiteelement method is used to both discretize the wave equations and enforce the divergence-free condition. For wave propagation described in terms of the magnetic field in the widely used class of nonmagnetic materials, the divergence-free condition is imposed on the magnetic field. This naturally leads to a nodal topology optimization method. When wave propagation is described using the electric field, the divergence-free condition must be imposed on the electric displacement. In this case, the material in the design domain is assumed to be piecewise homogeneous to impose the divergencefree condition on the electric field. This results in an element-wise topology optimization algorithm. The topology optimization problems are regularized using a Helmholtz filter and a threshold projection method and are analysed using a continuous adjoint method. In order to ensure the applicability of the filter in the element-wise topology optimization version, a regularization method is presented to project the nodal into an element-wise physical density variable. © 2016 The Author(s) Published by the Royal Society. All rights reserved.


Wang T.-T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The antireflective and protective coatings were deposited on the germanium substrates to improve the transmittance and the environmental adaptability. The germanium carbide (Ge1-xCx) coatings were successfully fabricated.The pure germanium was evaporated by the e-gun, and the methane was directly ionized by End-Hall ion source.The different optical constants of the germanium carbide coatings were obtained by controlling the deposition rate and fixing End-Hall ion source parameters. The germanium carbide coatings with different deposition rates were all amorphous tested by X-ray diffraction. The optical constants were calculated by the envelope method from the transmittance data measured by Fourier transform infrared (FTIR) spectrometer. After double-side depositing the germanium carbide coatings on the germanium substrate, an average transmittance Tave>85% was achieved in the long-wave infrared region of 7.5~11.5 μm. After the environment tests, the germanium carbide coating was fine, this indicates the germanium carbide coating has great environmental adaptability.


Zhang S.,Shandong University | Ding T.C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li J.F.,Shandong University
Machining Science and Technology | Year: 2012

In the present research, the microstructural alteration and microhardness at near-surface of AISI H13 steel by hard milling under different cutting parameters with coated cutting tools have been investigated. Very thin white layer forms or even no obvious microstructural alteration layer appears at the near-surface. It is reasonable that the formation of the very thin white layer is primarily due to mechanical effect (severe plastic deformation) rather than thermal effect (rapid heating and quenching). The hook shape of the microhardness profile indicates that the highest microhardness appears on the very top surface; while the smallest microhardness occurs at the depth of 25 m below the machined surface. Moreover, the microhardness profiles below the machined surfaces well correlate with the microstructural change of the machined near-surface. It is expected that the experimental results will provide a useful guide to control or minimize the white layer formation and, more significantly, to promote the application of hard milling technique in die and mold industry. © 2012 Taylor & Francis Group, LLC.


Liu Z.,CAS Changchun Institute of Applied Chemistry | Liu Z.,University of Chinese Academy of Sciences | Li Z.,CAS Changchun Institute of Applied Chemistry | Li Z.,University of Chinese Academy of Sciences | And 5 more authors.
Biomaterials | Year: 2012

Nanoparticulate imaging agents offer excellent diagnostic and therapeutic capabilities due to their intense and stable output, strong target binding via multiple ligands, as well as tunable biodistribution profiles. In the present work, we designed and synthesized PEGylated Yb 2O 3:Er nanoparticles with high Yb content in single particle (denoted as PEG-UCNPs) suitable for both X-ray CT imaging and up-conversion imaging. These PEG-UCNPs were facile to construct, possessed excellent stability against in vivo environment, and held long blood circulation time. Cell-cytotoxicity assay, hemolyticity, and post-injection histology analysis further demonstrated the excellent biocompatibility, indicating the feasibilities of PEG-UCNPs for in vivo applications. Compared with routinely used Iobitridol in clinic, well-prepared PEG-UCNPs provided much significantly enhanced contrast at a clinical 120 kVp voltage. By doping 5% Er 3+ into the nanoparticles, PEG-UCNPs presented a long-term stable and nearly single-band red up-conversion emission upon continuous irradiation with an assistant of a 980 laser. In addition, pharmacokinetics, biodistribution, as well as clearance of nanoparticles were studied after intravenous injection in a mouse model, reflecting their overall safety. PEG-UCNPs composed of intrinsic up-conversion luminescence property, higher X-ray absorption over Iobitridol, as well as excellent biocompatibility represented a nanoplatform for biomedicine applications. © 2012 Elsevier Ltd.


He X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Applied Optics | Year: 2016

The high-quality flat reflector with 2 m aperture can be used for image quality evaluation and performance testing of large-aperture optical instruments. However, by the impact of usage environment, the surface accuracy of large flat reflector cannot maintain long-term stability. Therefore, the surface quality needs to fast calibration on site before using. But the conventional full-caliber or sub-aperture interferometry measurement methods are difficult to meet these needs. Due to the high frequency error of mirror introduced in the manufacturing process being in a steady state, the environmental perturbations introduce only low frequency aberrations. And the selected reconstructed wave-front profile followed with sub-aperture slope scanning is more suitable for surface quality calibration on site of large flat reflector. A double-pentaprism with dual-goniometer synchronize differential measurement method was proposed, which could reduce the random error caused by environmental disturbances in long measurement cycle. Moreover, the optical, mechanical and control system of measurement instrument was designed. And two S-H sensors were proposed to use to instead of traditional goniometer for sub-apertures slope measurement. Currently validation tests show that the wave-front reconstruction algorithms and instrument angular accuracy meet the demand of accuracy for surface quality, the mutual difference is less than 20 nm (root-mean-square, RMS) with the test result of ZYGO interferometric measurement. © 2016, Editorial Board, Journal of Applied Optics. All right reserved.


Liu B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012 - Proceedings | Year: 2012

In order to increase the electromagnetic torque density of micromotor with axial magnetic field, numerical analysis of permanent magnetic field and electromagnetic torque were deduced and the key factors of increasing torque density of micromotor was obtained. The numerical analysis of three-dimensional magnetic field in air gap produced by spliced sector permanent magnetic poles is done, and the way of improving flux density and permanent magnet use efficiency are given through investigating the influence of magnet thickness, height of air gap and pole interval rate and other parameters to air gap flux density and leakage flux. Based on the test of axial magnetic field and torque characteristic of micromotor, the analysis of micromotor magnetic field and calculation of torque are verified, meanwhile using the plane stator with 0.7mm thickness assemble micromotor having minimum air gap height of 1mm and its torque constant up to 3.8mNm/A. © 2012 IEEE.


Wang Y.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2012

In order to accentuate the complicated information that human eyes are sensitive to in an image, complex matrix is used to describe image structure. Local variance and pixel value are taken as the real part and imaginary, respectively. Singular value decomposition is performed on each block of the complex matrix, but standard deviation of the singular value distribution is used as the description of the image block. The standard deviation is calculated for the reference image and distorted image, respectively. The matrix composed of standard deviations corresponding to each block is used to obtain the distortion map. Quantified results are obtained by calculating the data distribution of the map. 779 distorted images in the LIVE database are used to test the performance of the proposed method. Experimental results show that the performance improvement is achieved by using complex matrix to describe image structure, which balances the distortion sensitivity. Consistency with the human visual perception of the proposed method is better than that of traditional methods.


Lin Y.,Northeast Normal University | Lin Y.,Beihua University | Jiang D.,Northeast Normal University | Wang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Physica A: Statistical Mechanics and its Applications | Year: 2014

In this paper, we consider a stochastic SIS epidemic model with vaccination. We prove that the densities of the distributions of the solution can converge in L1 to an invariant density under appropriate conditions. Also we find the support of the invariant density. © 2013 Elsevier B.V. All rights reserved.


Wang X.-K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2016

In order to overcome the difficulty of testing large off-axis convex asphere, the convex asphere systemic stitching testing method combining with wave aberration testing and subaperture stitching interferometry(SSI) is proposed. The basic principle and flow chart of this method are analyzed and researched, and the stitching mathematical model is established. When the primary mirror and second mirror of the three mirror astigmatism(TMA) system have been fabricated, we align and calibrate the optical system, and test wave aberration of all the fields successively. Then we can obtain the phase map of the whole aperture by the synthetical optimization stitching algorithm and interpolation, which provides the guarantee of the subsequent fabrication and systemic testing. With engineering examples, a large convex mirror with the aperture of 287 mm×115 mm is tested by the method, and the value of RMS of the surface error is close to 1/30λ(λ=632.8 nm) after two cycles of fabricating and testing. © 2016, China Science Publishing & Media LTD. All right reserved.


Cao P.,Changchun Institute of Technology | Bai Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The nano-ZnO was grown by electrochemical deposition method. In order to introduce N, the NH3 plasma post treatment was used. X-ray diffraction spectroscopy analyses indicate that N doping can not disturb the structure of ZnO. No additional peaks are observed in the sample. X-ray photoelectron spectroscopy analyses also indicate that N atoms permeate into the ZnO lattice and replace the O sites without changing the wurtzite structure. N doping enhances the separation efficiency of the photogenerated electron and hole, thereby improving the catalytic efficiency of the photocatalyst.


Sun X.-Q.,Beijing University of Chemical Technology | Meng Q.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Meng Q.-Y.,Beijing University of Chemical Technology
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The Eu-doped ZnO (ZnO:Eu) nanorod arrays have been successfully synthesized on nanoporous silicon pillar array (NSPA) substrates by hydrothermal method. The effective energy transfer from ZnO host to the doping ions has been revealed. The ZnO:Eu nanorod arrays could enrich the emissions of ZnO nanostructure, moreover, the fabrication method is simple under mild reaction condition. The presence of trivalent europium ions in ZnO crystal lattice has been confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the ultraviolet (UV) laser excitation, ZnO-related UV and near band energy blue-green emission and Eu3+-related red emission were observed, which were attributed to the emission of ZnO, the band edge transition, the intrinsic defects and the Eu3+ ions transition, respectively. Based on the energy band diagram, the photoluminescence (PL) mechanism has been discussed, as well as energy transfer occurs from ZnO host to Eu3+ ions through intrinsic defects states of ZnO in ZnO:Eu nanorods structure.


Kuang S.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

This paper demonstrates theoretically that a Raman gain grating can be formed in an ultracold atomic medium driven by a standing wave and a probe field. Due to the spatial modulation of active Raman gain, the weak probe field propagating along the direction normal to the standing wave can be diffracted into the first-order direction effectively, and the zero-order diffracted beam is also amplified. Under manipulation by a microwave field, the first-order diffraction efficiency can be improved to be higher than that of electromagnetically induced phase grating. This system can be used as a highly efficient switch for an all-optical network.


Liu Z.,Jilin University | Yu G.,Jilin University | Yao H.,Jilin University | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
New Journal of Physics | Year: 2012

A π-electronic tight-binding (TB) model with, at most, three independent parameters is found to well fit the density functional theory results about the dispersions of the conduction and valence bands of α-, β-, γ- and (6,6,12)-graphyne. By means of such a toy model, the electron-hole symmetry in these graphynes is demonstrated. An explicit expression of the dispersion relation of α-graphyne is obtained. The position of the Dirac point on a particular Γ-M line in the Brillouin zone of β-graphyne is analytically determined. The absence of Dirac cones in γ-graphyne is intuitively explained. Based on these interesting results, it is believed that this TB model provides a simple but effective theoretical approach for further study of the electronic and transport properties of these typical graphynes. © IOP Publishing and Deutsche Physikalische Gesellschaft.


Ji Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Mechanics and Materials | Year: 2012

This article introduces a dynamic target simulation device to evaluate dynamic image quality of the aerial camera. The device simulated the positional relationship of the sky and ground in the laboratory when aerial camera flies at high altitude. And it can be used to inspect camera image quality of aerial camera flying at high altitude in laboratory. At a same time, the article focuses on this servo control system of device, building a control model, and giving control strategy. The servo control system was proved stably and reliably after experimental verification. And it provides a strong guarantee for the test of the dynamic image. © (2012) Trans Tech Publications, Switzerland.


Yanjie L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics InfoBase Conference Papers | Year: 2013

To alleviate the load of the satellite, a new co-aperture optical system for space imaging and laser communication is proposed. The design methods of initial configuration of the co-aperture optical system are proposed by using the primary aberration theory and such a system is designed as an example. The result shows that the design can satisfy the need of space imaging and laser communicating.


Song S.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2015

In order to evaluate wavefront of imaging systems, the wavefront gradient deviation evaluation methods were proposed, which could directly indicate imaging performance. The wavefront gradient deviation is defined as the deviation of image spot and image energy center, and the relative wavefront gradient deviation is the ratio of wavefront gradient deviation to Airy disk radius. The wavefront gradient deviation and relative gradient deviation can be evaluated by image size, image concentration and image energy distribution. Based on dozens of practical wavefront testing results, the evaluations of image concentration and image energy distribution are usually stable enough for different test resolutions. The difference of evaluation results is usually less than 10% for every double or half resolution. An aspherical wavefront and a spherical wavefront with dramatically ripple amount were analyzed to illustrate the relationship of wavefront gradient deviation and wavefront spacial distribution. Relied on the wavefront gradient deviation distribution on exit pupil and wavefront gradient distribution on image plane, it is convenient to operate for optical manufacture and assembling. The wavefront gradient deviation evaluations can be used as the wavefront specifications for quality control. © 2015, Chinese Optical Society. All right reserved.


Ma H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu L.,University of Adelaide
Applied Optics | Year: 2015

We present the design of a horizontally staggered lightguide solar concentrator with lateral displacement tracking for high concentration applications. This solar concentrator consists of an array of telecentric primary concentrators, a horizontally staggered lightguide layer, and a vertically tapered lightguide layer. The primary concentrator is realized by two plano-aspheric lenses with lateral movement and maintains a high F-number over an angle range of ± 23.5°. The results of the simulations show that the solar concentrator achieves a high concentration ratio of 500 × with ± 0.5° of acceptance angle by a single-axis tracker and dual lateral translation stages. © 2015 Optical Society of America.