Wang L.,Changchun University of Science and Technology |
Wang L.,Changchun UP Optotech Co. |
Liu F.,Changchun University of Science and Technology |
Zhang H.,Changchun University of Science and Technology |
And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2016
Rare earth is an ideal modification and alloying element. Cerium oxide is transited into welding pool through preset method for Nd:YAG laser-MAG arc hybrid welding. Then microstructure and low temperature (-40℃) impact properties of welded joints are studied. Results indicated that proper amount of cerium oxide can control the grain growth and refine the microstructure of weld; the grain refinement level is very obvious in the addition of 0.3%. Grain size and dendrites gap are increased with the increase of cerium oxide, but cerium oxide doesn't change its microstructure, they are still dominated by lath martensite. Cerium oxide can purify the weld, modify the inclusion effectively and play a heterogeneous nuclei role; inclusions of the weld zone are mainly cerium oxides and cerium oxysulfide. Through low temperature impact test, it was found that the impact energy of the weld and heat affect zone is first increased and then decreased with the increase of the amount of cerium oxide, the impact energy is the maximum in the addition of 0.3% and 0.5%, there are many and deep dimples in the fracture, It is mainly ductile fracture for welded joint. © 2016 Journal of Mechanical Engineering.
Yang X.,Changchun University of Science and Technology |
Song L.,Changchun University of Science and Technology |
Zhang Y.H.,Changchun UP Optotech Co.
Laser Physics | Year: 2012
We report a red laser at 670.5 nm generation by intracavity frequency doubling of a continuous wave (CW) laser operation of a 1341 nm Nd:GdVO 4 laser under in-band diode pumping at 912 nm. An LBO crystal, cut for critical type I phase matching is used for second harmonic generation of the laser. At an incident pump power of 8.9 W, as high as 347 mW of CW output power at 670.5 nm is achieved. The fluctuation of the red output power was better than 3.7% in the given 30 min, and the beam quality factor M 2 is 1.65. © Pleiades Publishing, Ltd., 2012.
Li Y.L.,Changchun University of Science and Technology |
Zhang Y.H.,Changchun UP Optotech Co. |
Zhang Y.C.,Changchun University of Science and Technology
Laser Physics | Year: 2012
We report a green laser at 541.5 nm generation by intracavity frequency doubling of a continuous wave (cw) laser operation of a 1083 nm Nd:GdVO 4 laser under 880 nm diode pumping into the emitting level 4F 3/2. A LiB 3O 5 (LBO) crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At an incident pump power of 17.8 W, as high as 2.52 W of cw output power at 541.5 nm is achieved. The optical-to-optical conversion efficiency is up to 14.2%, and the fluctuation of the green output power was better than 3.6% in the given 30 min. © Pleiades Publishing, Ltd., 2012.
Yan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Yan L.,University of Chinese Academy of Sciences |
Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Zheng L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014
In order to solve the problem evaluating the stitching accuracy of large-diameter reflecting mirror, a kind of stitching accuracy evaluating method called self-test was proposed in the article, realizing the analysis and evaluation to the stitching accuracy of large-diameter reflector mirror, while providing a method measuring the stitching precision. Self-test was a kind of method testing the accuracy of stitching result with sub-aperture measuring result. In the article, relative accuracy evaluation indexes and their calculation methods were discussed. As a project example, φ800 mm plane mirror was splicing measured with a φ600 mm interferometer and stitching accuracy was evaluated with the self-test method. It shows that the stitching is accurate and it's reliable and precise to assess stitching accuracy by the way of self-test at the same time.
Li L.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Li L.-Y.,University of Chinese Academy of Sciences |
Wang Y.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Wang J.,Changchun UP Optotech Co.
Chinese Optics | Year: 2011
Varifocal optical system can meet the requirements of dynamic optical systems by changing optical parameters of optical components to adjust optical paths. This paper firstly introduces the fundamentals of varifocal optical system, and describes the design of the varifocal optical systems based on optical compensation and mechanical compensation. Then, it elaborates the type and structures of common focusing mechanisms and analyzes their advantages and disadvantages. It points out that along with the DSP control technology and stepping motor development, the varifocal optical mechanism has entered a new prospect. By making a reference to domestic and international engineering applications, the research shows that the numerical control technology based on stepping motors and DSP has an extensive forecast on varifocal optical mechanisms in the range equipment.
Yang Z.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Yang Z.-L.,University of Chinese Academy of Sciences |
Chen Y.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Shan X.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
And 2 more authors.
Chinese Journal of Liquid Crystals and Displays | Year: 2016
In order to acquire synchronously and transfer four channels signal outputted by quadrant detector, a high-resolution, high-rate synchronous data acquisition and transmission system is designed. Firstly, an FPGA chip named EP1C12Q240 is selected as the core to control the acquisition of AD (ADS1274) and buffer data into FIFO on chip. Then the data is packaged into images consist of 32×40 pixels according to Camera Link protocol, and transferred to PC via Camera Link interface. Finally, the images are acquired by image acquisition, decoded using software programmed with MATLAB, and stored in PC. Experimental results show that the system, whose effective resolution is up to 18.79 bit, achieves a resolution of 24 bit, sampling rate of 100 kHz and 4-channel synchronous data acquisition, and can transfer data stably and reliably. The system meets the requirements of high resolution, high sample rate and synchronous acquisition. In addition, it has good scalability and could be ported to other applications. © 2016, Science Press. All rights reserved.
Gu Z.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Gu Z.-Y.,University of Chinese Academy of Sciences |
Yan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Li X.-B.,Changchun UP Optotech Co. |
And 3 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2015
To calculate the misalignments of optical elements accurately in an off-axis Mersenne afocal Cassegrain telescope, a computer-aided alignment method based on modified sensitivity matrix model was proposed. The principle and limitations of conventional sensitivity matrix method were analyzed. By means of adding a quadratic correction term to conventional sensitivity matrix model, the conventional computer-aided alignment technology was improved. For the off-axis telescope, the aberration characteristics were analyzed when the secondary mirror was misaligned. The modified model and conventional model were used to approximate the mapping relationships between misalignments and aberrations. Then the alignment of misaligned telescope was simulated. The simulation results in the range of decenter ±8 mm and tilt ±1.5° for a secondary mirror show that the root mean square error of x-, y-, z-decenters and α-, β-tilts of the secondary mirror calculated by conventional method are 2.689 mm, 2.494 mm, 0.194 mm and 0.500°, 0.525° respectively, and the corresponding calculations by modified method are 0.404 mm, 0.323 mm, 0.047 mm and 0.064°, 0.065° respectively. The calculation accuracy of the modified sensitivity matrix method is much higher than that of the conventional method. Finally, the telescope is well aligned with the modified method, and the results give that the Wavefront Errors (WFEs) RMS on axis is 0.056λ(λ=632.8 nm), while the WFEs RMS (Root Mean Square) in marginal field of view are better than 0.1λ. The results meet the design requirements. ©, 2015, Chinese Academy of Sciences. All right reserved.
Wang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Zhang L.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Yao H.,Changchun UP Optotech Co.
Guangzi Xuebao/Acta Photonica Sinica | Year: 2010
In order to improve thepositioning accuracy of mapping system, a design on optical lens of transmission semi-telecentric beam path in image space is expounded, and assembly method based on DFT(Design For Test) of single lens suit and whole optical lens are expounded. The results show that the proposed MTF of optical lens is 0.45(@77 lp/mm), the ground resolution power is 5m, and the distortion is 3/10000. The test results indicate that each parameter can satisfy user's qualification.
Jiang W.,Changchun UP Optotech Co. |
Wang H.-W.,Changchun Region Office of Military Representative
Corrosion and Protection | Year: 2010
A black delustering and conducting film was prapered by hard anodic oxidation and conductive oxidation. The oxide film could satisfy the requirements of wear resistance, optical and electric properties for optical instrument with high precision, and the process-cycle and difficulty of machining work were reduced.
Yao H.,Changchun UP Optotech Co.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010
In ground-based optical detection system, when large aperture primary mirror in a different pitch angle detection, the surface shape error of primary mirror is affected by its weight deformation, and the surface shape error of primary mirror is one of the key factors affecting imaging quality. The primary mirror support system, including axial support and radial support, and the axial support is main factor affecting the surface shape error of primary mirror, the position and number of axial support is very important for surface shape error of primary mirror. The support technology of Φ1.2m primary mirror was studied detailedly in this paper, the parameterized model of primary mirror was built based on ANSYS, the relationship between the surface shape error of primary mirror and the ratio of its diameter to thickness was analyzed, the axial support was optimized, and the support-ring number, support-ring radius and support point position of axial support were optimum designed. The result of analysis showed that the Root-Mean-Square (RMS) value of the surface shape error of primary mirror was 1.8 nm, when the primary mirror pointed to zenith, met to the design need of the optical system, and the axial support system was verified. © 2010 Copyright SPIE - The International Society for Optical Engineering.