Science and Technology on Electro Optical Information Security Control Laboratory

Sanhe, China

Science and Technology on Electro Optical Information Security Control Laboratory

Sanhe, China
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Li M.,Science and Technology on Electro Optical Information Security Control Laboratory | Cai J.,Science and Technology on Electro Optical Information Security Control Laboratory | Xu H.,Science and Technology on Electro Optical Information Security Control Laboratory | Wang X.,University of Electronic Science and Technology of China | Wu L.,University of Electronic Science and Technology of China
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

Beam steering characteristics of transmission liquid crystal optical phased array(LC-OPA) were measured using ultra precision electronic autocollimator. A continuous beam steering with a constant angular resolution in the order of 20 μrad is obtained experimentally from 0° to 6° based on the method of variable period grating (VPG).Meanwhile, the angular repeatability of less than 4 μrad (RMS) has been achieved. © 2017 SPIE.


Chen X.,University of Science and Technology Beijing | Wang L.,Peking University | Li C.,University of Science and Technology Beijing | Xiao J.,University of Science and Technology Beijing | And 6 more authors.
Chemical Communications | Year: 2013

A new series of azobenzene-dimers were synthesized and doped into the blue phase liquid crystals to broaden the temperature range of BPs. It is found that not only can the reflection wavelength of BPI be reversibly controlled but BPI can also be transformed into the cholesteric phase owing to isomerization of azobenzene induced by light. © The Royal Society of Chemistry 2013.


Chen X.,University of Science and Technology Beijing | Wang L.,Peking University | Wang L.,Kent State University | Chen Y.,University of Science and Technology Beijing | And 7 more authors.
Chemical Communications | Year: 2014

A chiral nematic liquid crystal-photopolymerizable monomer-chiral azobenzene compound composite was prepared and then polymerized under UV irradiation. The reflection wavelength of the composite can be extended to cover the 1000-2400 nm range and also be adjusted to the visible light region by controlling the concentration of chiral compounds. © 2014 The Royal Society of Chemistry.


Xu Y.,China Institute of Technology | Sun X.-Q.,China Institute of Technology | Shao L.,China Institute of Technology | Shao L.,Science and Technology on Electro optical Information Security Control Laboratory
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The situation of researches on laser jamming to imaging detectors is analyzed and saturation effect of CCD under laser illumination is introduced. Combined with characteristics of CCD, diffraction limited point spread function (PSF) is applied to analyze the laser dazzled image and process of simulation is shown. Then simulated dazzled image is obtained and it is compared with actual image. With different laser powers, imaging performance parameters of simulated images are analyzed, such as Peak signal to noise ratio (PSNR), gray variation, definition, uniformity and so on. Experimental results show the feasibility and validity of laser jamming simulation. Moreover, changes of imaging performance parameters can provide useful references for further evaluation of laser jamming effect. © 2010 SPIE.


Ren G.,Xiangtan University | Ren G.,Science and Technology on Electro Optical Information Security Control Laboratory | Zeng S.,Xiangtan University | Zeng S.,Hong Kong Polytechnic University | Hao J.,Hong Kong Polytechnic University
Journal of Physical Chemistry C | Year: 2011

In this paper, highly monodispsered ultrasmall hexagonal phase NaGdF 4 nanorods were synthesized via a hydrothermal method using oleic acid as a stabilizing agent. The tunable multicolor upconversion (UC) emissions, including green, yellow, blue, and white emissions, can be readily achieved from lanthanide (Ln)-doped NaGdF 4 nanorods under the excitation of a 980 nm diode laser. The calculated chromaticity coordinates (CIE-X = 0.346, CIE-Y = 0.357) are close to those of the standard white light (CIE-X = 0.33, CIE-Y = 0.33), and the white UC emissions can be tuned from blue-white to white by adjusting the doped contents of Ho 3+ in the Yb 3+/ Tm 3+/Ho 3+ triply doped NaGdF 4 nanorods. In addition, the ultrasmall NaGdF 4 nanocrystals also exhibit paramagnetic properties at 293 K. The measured magnetizations of the NaGdF 4:20%Yb 3+/0.2% Er 3+ and NaGdF 4 nanocrystals were about 1.49 and 1.86 emu/g at 20 kOe, respectively, which were close to the reported values of other nanoparticles for bioseparation. Moreover, the NaGdF 4 nanocrystals can be readily attracted by a small magnet, which shows it has potential application in cell isolating. It is expected that these multifunctional ultrasmall NaGdF 4 nanorods including tunable UC colors and intrinsic paramagnetic properties may have potential applications in color displays, biolables, bioseparation, and magnetic resonance imaging. © 2011 American Chemical Society.


Ye F.,Nanjing University of Science and Technology | Zhu C.G.,Nanjing University of Science and Technology | Zhang Z.H.,Science and Technology on Electro optical Information Security Control Laboratory
Advanced Materials Research | Year: 2014

The expansion mechanism of expandable graphite (EG) was studied systematically in this paper. Based on the feature of the structure and the linear expansion of expandable graphite, a simple expansion model was established by the energy balance and mass balance equation. And the model was modified by setting of the boundary conditions. The result showed that a good agreement is confirmed by comparing the test data and model, especially the two inflection points of the growth rate. The study may provide theory support for improving using condition and expand application fields of the expandable graphite. © (2014) Trans Tech Publications, Switzerland.


Qiu W.C.,National University of Defense Technology | Cheng X.A.,National University of Defense Technology | Cheng X.A.,Science and Technology on Electro Optical Information Security Control Laboratory | Wang R.,National University of Defense Technology | And 2 more authors.
Journal of Applied Physics | Year: 2014

In this paper, experimental results of temperature-dependent signal inversion of laser beam induced current (LBIC) for femtosecond-laser-drilling- induced junction on vacancy-doped p-type HgCdTe are reported. LBIC characterization shows that the traps induced by femtosecond laser drilling are sensitive to temperature. Theoretical models for trap-related p-n junction transformation are proposed and demonstrated using numerical simulations. The simulations are in good agreement with the experimental results. The effects of traps and mixed conduction are possibly the main reasons that result in the novel signal inversion of LBIC microscope at room temperature. The research results provide a theoretical guide for practical applications of large-scale array HgCdTe infrared photovoltaic detectors formed by femtosecond laser drilling, which may act as a potential new method for fabricating HgCdTe photodiodes. © 2014 AIP Publishing LLC.


Jiang J.,North China Institute of Science and Technology | Zhang X.,Science and Technology on Electro optical Information Security Control Laboratory
Advanced Materials Research | Year: 2012

In this paper, intelligent control system in the intersection was designed by use of the control principles of green light length. The green light time from four groups were controlled by actual traffic flow, which could be detected by use of inductive sensors to auto-adjust the length of time. Secondly, combined with the traffic scale, road, time and seasonal changes situation, turn-left controller was tried to add in the traffic lights system by use of fuzzy control method at the crossroads. The feasibility of control principles from green light length were verified by debug in the PLC program. © (2012) Trans Tech Publications, Switzerland.


Hu T.,Science and Technology on Electro Optical Information Security Control Laboratory | Chen Y.-N.,Science and Technology on Electro Optical Information Security Control Laboratory
ICEOE 2011 - 2011 International Conference on Electronics and Optoelectronics, Proceedings | Year: 2011

Linear array CCD acquisition system is generally used for high precision measurement and control field. In this paper, firstly introduce a design of linear array CCD acquisition system that provide two features of adjustable line frequency and integration time, and secondly present linear array CCD acquisition system components, linear array CCD device principles, timing-driven design, signal processing circuit and data acquisition circuit, then highlights the linear array CCD timing-driven design, the design of line frequency and integration time adjustable, and illustrate the advantages of the system such as the convenience, the agility and the reliability, etc. © 2011 IEEE.


Li Y.,Science and Technology on Electro Optical Information Security Control Laboratory
2015 International Conference on Optoelectronics and Microelectronics, ICOM 2015 | Year: 2015

Connected component (CC) labeling is time consuming during image segmentation and object identification, especially when input images are large-scale and binary converting uses multi-threshold. So in this paper, we present a fast multi-level CC labeling by combining online threshold segmentation and a one-pass labeling algorithm, also a detailed architecture for hardware implementation is proposed. During labeling, firstly a gray image is converted to several binary data flows with different thresholds. Then they are marked by run-length code respectively with 2× 2 scanning windows, in the meantime, the equal labels between two adjacent rows are obtained by these windows for CC merging. By executing this process until the end of input image, the CC labels are obtained after one-pass image scanning. Our method is tested on more than 1000 gray images which resolution are 1920×1080. Experimental results show that our algorithm can extract the positions and areas of CC in multi-threshold binary images at least 50 frames per second (fps) on a Stratix IV FPGA platform running at 109.7 MHz. © 2015 IEEE.

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