Journals >Electro-Optic Technology Application
Contents
2017
Volume: 32 Issue 5
14 Article(s)
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[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 1 (2017)
Design of Infrared Continuous Zoom Optical System with High Resolution
WU Fan, and LI Sen-sen
A 4× continuous zoom optical system with high resolution is designed for the application of the long wave uncooled focal plane array (FPA) detector with 1 024×768 pixels. The zoom process of the system is analyzed by using a macro program written by ZEMAX macro language. The mechanical compensation zoom mode A 4× continuous zoom optical system with high resolution is designed for the application of the long wave uncooled focal plane array (FPA) detector with 1 024×768 pixels. The zoom process of the system is analyzed by using a macro program written by ZEMAX macro language. The mechanical compensation zoom mode is used in the system, and there are six pieces of germanium lenses with three aspheric and one diffractive surface. The high order aberrations is well corrected and the system can zoom smoothly and continuously in the focus length range of 25~100 mm with the viewing angle from 32°×24.3° to 8.2°×6.15°. From the zoom cam curve output from macro program, diffuse spot curve and field distortion curve, it can be seen that the system runs smoothly in the whole zoom process with a high-quality stable image, the various of the diffuse spot and the field distortion is small. In conclusion, the system has the advantages of compact structure, large relative aperture (F#1~1.4), small field distortion, high image quality, and easy to manufacture the zoom cam mechanism, and has high application value..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 1 (2017)
Analysis and Design of Optical System for the Infrared and Ultraviolet Warning in the Near-space
WANG Wen-cong, JIN Dong-dong, LI Wen-bin, HU Hui-jun, SHI Yu-feng, CHU Xin-bo, LUO Yu-xiang, and SHAO Si-pei
The relevant development status of solar blind ultraviolet and infrared warning is reviewed. According to current application demands for the missile warning payload in near-space, a dual-band early warning system is presented, which covers the solar blind ultraviolet 250~280 nm and middle wavelength infrared (MWIR) 3 The relevant development status of solar blind ultraviolet and infrared warning is reviewed. According to current application demands for the missile warning payload in near-space, a dual-band early warning system is presented, which covers the solar blind ultraviolet 250~280 nm and middle wavelength infrared (MWIR) 3 000~5 000 nm. The dual-band system is used to realize the detection and warning to military targets such as missile, which can effectively reduce the false alarm rate. A three-mirror off-axis system is taken as the main anti-optical system and the splitter is used to realize beam splitting on two spectral bands. According to the detector used by the optical systems on two bands and the corresponding application needs, the structure calculation and optical design of the optical system are completed. After the design is completed, the modulation transfer function (MTF) of two bands of the optical system at Nyquist frequency are solar blind ultraviolet MTF>0.8@39 lp/mm and MWIR MTF>0.8@17 lp/mm respectively. The maximum root mean square (RMS) spot diameter of two optical systems is smaller than the size of a detector and the single cell energy concentration is greater than 80%..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 5 (2017)
Laser Detection Characteristic Analysis of CO2 Diffusion of Aircraft Plume
ZHANG Hua, HU Yi-hua, and LIN Fang
The CO2 concentration diffusion field of aircraft plume is one of the target characteristics that the aircraft can’t hide, by which it’s possible to detect aircraft indirectly. With a simplified aircraft model, the numerical simulation method is used to simulate the CO2 concentration diffusion field of aircraft plume uThe CO2 concentration diffusion field of aircraft plume is one of the target characteristics that the aircraft can’t hide, by which it’s possible to detect aircraft indirectly. With a simplified aircraft model, the numerical simulation method is used to simulate the CO2 concentration diffusion field of aircraft plume under typical working conditions. Then the process of detecting targets and obtaining CO2 concentration distribution by a lidar system is simulated with simulation results. And the detection performances of the laser detection system under different parameters is simulated and analyzed. The results show that the CO2 diffusion of the aircraft plume is detectable with appropriate laser divergence angle, scanning angle interval and space integral distance. The distance between the CO2 disturbance center and the preset target is 2.9 m when the combination of above parameters is 0.5 mrad, 4.4°, 20 m or 5 mrad, 4.4°, 20 m. This research may provide a reference for practical application..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 12 (2017)
Synchronization between Multi-links Laser Spatiotemporal Networks and Parameter Identification
YAN Zhe
The problems about synchronization between multi-links laser spatiotemporal networks and parameter identification are researched. A practical network controller is designed, the Lyapunov stability theorem is used to construct a proper Lyapunov function, and the synchronization criteria for multi-links spatiotemporal neThe problems about synchronization between multi-links laser spatiotemporal networks and parameter identification are researched. A practical network controller is designed, the Lyapunov stability theorem is used to construct a proper Lyapunov function, and the synchronization criteria for multi-links spatiotemporal networks is obtained. At the same time, the uncertain parameters of the network nodes and the coupling matrix elements of the network controller can be identified effectively. The ring cavity laser model is used as the network nodes for numerical simulation. The synchronization effect is verified. And the simulation images are analyzed and discussed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 17 (2017)
Cluster Synchronization of Discrete Laser Time-space Network with Different Structure
GAO Yan
Cluster synchronization of discrete laser time-space network with different structure is researched. Firstly, the Lyapunov theorem is used to construct a suitable Lyapunov function to realize the cluster synchronization of the discrete time-space network and the target system. Secondly, the recognition function of the Cluster synchronization of discrete laser time-space network with different structure is researched. Firstly, the Lyapunov theorem is used to construct a suitable Lyapunov function to realize the cluster synchronization of the discrete time-space network and the target system. Secondly, the recognition function of the variation parameter in network and the network synchronization controller are designed. Finally, the laser phase conjugate wave spatial expansion system with spatiotemporal chaos behavior, Gibbs electro-optical spatiotemporal chaos model and Bragg acousto-optic spatiotemporal chaos model are selected as the state equations of three cluster network nodes. The dynamic equation of the coupled map lattice with single phase is used as a target system, and the feasibility of the synchronization scheme is verified by numerical simulation. The designed synchronization technology is suitable to both the synchronization of the same structure networks and the synchronization of different structure networks. Therefore, it’s generally suitable..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 24 (2017)
Scaling Function Projective Synchronization between Uncertain Laser Spatiotemporal Networks with Different Number of Nodes
RONG Ting-ting
A class of scaling functions projective synchronization between uncertain laser spatiotemporal networks with different number of nodes is researched. Through designing appropriate controllers, not only the projective synchronization between discrete uncertain spatiotemporal networks with different number of nodes is reA class of scaling functions projective synchronization between uncertain laser spatiotemporal networks with different number of nodes is researched. Through designing appropriate controllers, not only the projective synchronization between discrete uncertain spatiotemporal networks with different number of nodes is realized, but also the coupling matrix element representing the topological structure of the network, the feedback strength and scale function are determined at the same time. By taking the spatiotemporal network composed of one-dimensional ring cavity laser model and electro-optical bidirectional coupled lattice model as an example to simulate, the number of network nodes is arbitrarily set according to actual needs, and it is found that the synchronization performance of the uncertain spatiotemporal network is very stable, which shows that this method is feasible..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 32 (2017)
Research on Fabrication and Laser Protection of CdxZn1-xSe/PMMA Quantum Dots Organic Composite
HUANG Guo-chang, CHEN Jia-gen, ZHANG Jin-hua, ZHAO Da-peng, ZHAO Ming-hui, CHENG Xiao-peng, and YU Da-bin
Due to the unique nonlinear optical properties, quantum dot draws an extensive attention in the field of laser protection. However, the nonlinear optical effect of quantum dots is greatly undermined by its feature of easy clustering and transmutation. To solve this problem, the method of fabricating the CdxZn1-xSe/polyDue to the unique nonlinear optical properties, quantum dot draws an extensive attention in the field of laser protection. However, the nonlinear optical effect of quantum dots is greatly undermined by its feature of easy clustering and transmutation. To solve this problem, the method of fabricating the CdxZn1-xSe/polymethylmethacrylate (PMMA) has been researched, and Z-scan technique has been used to conduct a research on the nonlinear optical properties of the fabricated CdxZn1-xSe/PMMA quantum dot organic polymer composite under a condition of 532 nm laser. The results show that with the Methyl methacrylate (MMA) as a polymer monomer, and Benzoyl peroxide (BPO) as an initiator, a uniform, stable and transparent CdxZn1-xSe/PMMA quantum dot organic glass has been successfully fabricated by using a modified blending method. The best three order nonlinear absorption and refraction coefficients are respectively achieved 7.90×10-8 m/W and -0.99×10-8 esu, and nonlinear properties is notable. Thus, the CdxZn1-xSe/PMMA quantum dot organic polymer composites have important and potential value in laser protection..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 39 (2017)
Molecular Dynamics Simulation of 4H-SiC under Irradiation Defects Formation Mechanism
HE Tao, HE Hong-yu, ZHOU Yuan, ZHU Wei-hua, CHEN Zhi-yong, and WANG Xin-lin
The molecular dynamics method is used to simulate the cascade collision of 4H-SiC material with hexagonal crystal structure by using LAMMPS code. 4H-SiC crystal structure model is established and the evolution of radiation-induced point defects by the collision cascade is simulated at different primary knock-on atom (PThe molecular dynamics method is used to simulate the cascade collision of 4H-SiC material with hexagonal crystal structure by using LAMMPS code. 4H-SiC crystal structure model is established and the evolution of radiation-induced point defects by the collision cascade is simulated at different primary knock-on atom (PKA) energy and initial incident direction. The simulation results show that the total point defects include vacancy defects, interstitial atoms and antisite defects, giving priority to vacancy defects and interstitial. The space distribution of vacancy defects and interstitial atoms is given, in which the number of vacancy defects produced by cascade collision has linear relationship with PKA energy, the space distributions of vacancy defects and interstitial atoms, especially the gathered area of vacancy defects and interstitial atoms, has a close relationship with PKA energy. The above results provide a theoretical basis for the analysis of electrical properties change of electronic devices with 4H-SiC substrate under irradiation environment..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 45 (2017)
Classification and Identification System Based on Pattern from the Surface of Solar Panel
[in Chinese], [in Chinese], and [in Chinese]
In the process of mass production in solar panels, different patterns which are dark or light will be formed on the surface of the panels due to the production technology. An automatic classification system is needed by the factory to improve work efficiency, so an artificial intelligence identification system as a claIn the process of mass production in solar panels, different patterns which are dark or light will be formed on the surface of the panels due to the production technology. An automatic classification system is needed by the factory to improve work efficiency, so an artificial intelligence identification system as a classifier is proposed to meet this demand. The solar panels will be classified by the system using the surface pattern of solar panels as a reference. Firstly, local binary pattern (LBP) operator is used as classification features, the samples of solar panels will be divided into two categories which are separately named With crystal and No crystal. And then, the local contrast is taken as the classification feature, and the with crystal sample are also divided into two categories such as dark crystal and light crystal. In order to meet the rapid and accurate demands of industrial production, back propagation (BP) neural networks are adopted in auto-recognition as a classifier. Experimental results show that the classification system has fast speed and high accuracy rate, which can meet the demands of actual industrial production line..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 52 (2017)
A Novel Algorithm Based on Cumulative Distribution for Low Illumination Color Image Enhancement
FENG Qing-zhi, and HU Tian-yi
To resolve the degradation of color images caused by low illumination condition, a novel algorithm to improve the visibility of low illumination color images is proposed. At first, the illumination component is estimated using the color-bilateral filtering in YUV color space. And then, while the reflectance component bTo resolve the degradation of color images caused by low illumination condition, a novel algorithm to improve the visibility of low illumination color images is proposed. At first, the illumination component is estimated using the color-bilateral filtering in YUV color space. And then, while the reflectance component being calculated, a contrast regulation function based on cumulative distribution is introduced to adaptively emphasize minute features of images. At last, a linear color restoration process is utilized to determine color values of the enhanced image. Experimental results show that the proposed algorithm is more effective and practicable, and the enhanced image can achieve an excellent global visual effect with clear details and natural colors..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 57 (2017)
Logistic Chaotic Sequence Encryption Algorithm Based on LDPC Coding
MENG Xiang-cai, and WANG Zhong-xun
Logistic chaotic sequence is an encryption sequence, which enhances the security of the information sequence. At first, low density parity check (LDPC) channel coding is applied to logistic chaotic sequence. The chaos sequence is generated randomly, and the watermark is scrambled with the sequence. And then, LDPC codinLogistic chaotic sequence is an encryption sequence, which enhances the security of the information sequence. At first, low density parity check (LDPC) channel coding is applied to logistic chaotic sequence. The chaos sequence is generated randomly, and the watermark is scrambled with the sequence. And then, LDPC coding modulation is applied to the watermark message which is embedded to discrete cosine transform (DCT) domain of the host image. At end, double encryption is realized. Thus, the capacity of resisting disturbance during information transmitting process is advanced, the error rate is reduced and the stability of the transmitting system is increased..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 62 (2017)
Design of Absolute Location Address System of Displacement Platform Based on ATMEG16A
WANG Jian-rui
Taking ATMEG16A micro control unit (MCU) as a controller, an absolute location address system is designed for the requirements of accurate controlling optical motor displacement platforms. A stepping motor is used as a displacement platform motor. L293D is used as a driver in the motor and KW6A micro switch is used as Taking ATMEG16A micro control unit (MCU) as a controller, an absolute location address system is designed for the requirements of accurate controlling optical motor displacement platforms. A stepping motor is used as a displacement platform motor. L293D is used as a driver in the motor and KW6A micro switch is used as a searching switch for zero position. The electrical level of the stepping motor is transmitted to L293D by IO port on the ATMEG16A to realize the accurate movement of the displacement platform. The zero location of the displacement platform is fixed through the micro switch to find absolute location address. From the repeat positioning accuracy measurement results of the displacement platform, when the positioning accuracy reaches 25 μm, the accurate positioning control for the absolute position address of the displacement platform is realized..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 65 (2017)
Research on Displacement Measurement of Object Based on Fresnel Digital Holography
LIU Zhe, ZHANG Wan-yi, and ZHAO Liang
The test of object displacement is always an unavoidable problem in the engineering field. The method of using traditional holographic interferometry to test the displacement of objects is complicated and the accuracy of measurement results is low. The digital hologram is a digitalization information process technologyThe test of object displacement is always an unavoidable problem in the engineering field. The method of using traditional holographic interferometry to test the displacement of objects is complicated and the accuracy of measurement results is low. The digital hologram is a digitalization information process technology combining traditional holography and modern electronic technology. The process of digital holographic recording and reconstruction is realized through combining charge-coupled device (CCD) with electrically addressed liquid crystal display (EALCD). Digital imaging processing technology is used to record and process holographic images to avoid traditional chemical processing. The quality of the reconstruction images is improved and the needed information is extracted. On the basis of theoretical analysis of digital holographic experiments, Fresnel holograms about reflecting measured objects are recorded and reconstructed, the clarity of the images and the contrast of holographic interferogram is significantly improved..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 32, Issue 5, 70 (2017)
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