Journals >Electro-Optic Technology Application
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2018
Volume: 33 Issue 3
20 Article(s)
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[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 1 (2018)
Auto Focusing Technology Based on Infrared Image
WANG Jian-rui
Auto focusing technology based on image processing is the main direction of auto focusing, in which the image sharpness evaluation function is the key to the success of focusing. The imaging details of infrared images are less than those of visible images, the unbiased and single peak characteristics of the simple imagAuto focusing technology based on image processing is the main direction of auto focusing, in which the image sharpness evaluation function is the key to the success of focusing. The imaging details of infrared images are less than those of visible images, the unbiased and single peak characteristics of the simple image sharpness evaluation function are discounted, so the traditional auto focusing method is not suitable to the infrared images. A two segment fast searching auto focusing method is proposed based on the combination of coarse and fine auto focusing methods. The method divides the auto focusing into two steps. First, the focal position is found quickly by coarse tuning. And second, the precise position of the focal point is finally found by fine tuning. Experiments show that this method can automatically focus the infrared imaging system, and the system has good stability and real-time characteristics..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 1 (2018)
Design of Large Aperture Infrared Dual View Optical System Based on Rotary Scanning
LU Xin
The difficulties of large-range long-distance detection are discussed. A dual field of view large aperture lens based on rotary scanning is designed to increase the detection range and distance of the system. The grouping design is used, the aperture of the front group system is compressed, and the galvanometer swing iThe difficulties of large-range long-distance detection are discussed. A dual field of view large aperture lens based on rotary scanning is designed to increase the detection range and distance of the system. The grouping design is used, the aperture of the front group system is compressed, and the galvanometer swing is used to compensate the image shift phenomenon during the rotation. So that the generated images can be stabilized and the detection accuracy is improved. The ideal system transfer function and dispersed spot are obtained through simulation, and large-range detection can be realized using rotary scanning of the large aperture system. This design provides a new way and idea to improve the insufficient of the detection distance or the range of the staring system..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 6 (2018)
Research on Panorama Assistant Driving System Based on Fish Eye Lens
LI Hong-peng
According to the requirements of panorama assistance driving systems, a non-spherical fish eye lens is designed. The design parameters and optical materials of the lens are determined, and the initial structure of the lens is built. Through the aberration correction and optimization design of the lens, the design resulAccording to the requirements of panorama assistance driving systems, a non-spherical fish eye lens is designed. The design parameters and optical materials of the lens are determined, and the initial structure of the lens is built. Through the aberration correction and optimization design of the lens, the design results are given. The designed non-spherical fish eye lens, distortion correction algorithm and overall hardware are implemented and verified to integrated with the panoramic display driver assistance system. The images captured by multiple lenses are synthesized and applied, and the experimental results show that the system has good application..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 10 (2018)
Analysis and Measurement of Beam Quality of Quantum Cascade Laser
CAI Jun, and LI Sen-sen
Quantum cascade laser (QCL) has been used in many fields for its characters of small size, small weight, high efficiency and direct modulation. The output laser beam of the QCL is nearly to be Guassian style. The evaluating method of the laser beam quality is analyzed in theory based on the Gaussian beam transmission lQuantum cascade laser (QCL) has been used in many fields for its characters of small size, small weight, high efficiency and direct modulation. The output laser beam of the QCL is nearly to be Guassian style. The evaluating method of the laser beam quality is analyzed in theory based on the Gaussian beam transmission law. And the output near field and far field of the single quantum cascade laser is measured in the experiment. The output divergence angle is calculated and the output beam quality is analyzed by using the M2 factor..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 13 (2018)
Influence of Gain Coefficient on Output Characteristics of Ring Cavity Laser
SU Min, JIN Yu-qing, REN Han, LV Ling, and ZOU Jia-rui
The influence of gain coefficient on the output characteristics of ring cavity laser is researched by numerical simulation. At first, the light intensity equation of the ring cavity laser model after transverse effect is given. And then, the dynamical behaviors of the laser system are determined by simulating the evoluThe influence of gain coefficient on the output characteristics of ring cavity laser is researched by numerical simulation. At first, the light intensity equation of the ring cavity laser model after transverse effect is given. And then, the dynamical behaviors of the laser system are determined by simulating the evolution of the Lyapunov exponent with the gain coefficient, and the formation of laser pattern of ring cavity laser after light transverse effect is demonstrated. At last, the influence of gain coefficient on the output characteristics of ring cavity laser is illustrated by simulating the laser patterns under different gain coefficients..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 17 (2018)
Study of Saturation Effect on Electro-optical Imaging System Induced by Intense Light
YANG Hai-bo, GUAN Shang-hong, SHAO Ming, and LIU Xiao-hu
Based on the experimental research on the electro-optical imaging system induced by intense light, the various rules of the parameters such as saturated pixels, the intensity of incidence, the parameters of the optical system and the saturated threshold of pixels are obtained. And the point spread function (PSF) of theBased on the experimental research on the electro-optical imaging system induced by intense light, the various rules of the parameters such as saturated pixels, the intensity of incidence, the parameters of the optical system and the saturated threshold of pixels are obtained. And the point spread function (PSF) of the optical system is used to verify theoretically. The result shows that saturated pixels have been made by diffraction effect. The relationships between saturated pixels and the intensity of incidence, wavelength, the parameters of the optical system, the saturated threshold of pixels are derived..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 21 (2018)
Research on Non-scanning Laser Radar Imaging Technology Based on Compressive Sensing
XIE Dian-guang, and LIU Jing-peng
Compressive sensing (CS) is a new theory of signal acquisition and processing emerged in recent years, which can sample signals at a rate much lower than the Nyquist sampling rate and implement high precision reconstruction of the signals. At first, the theory of compressive sensing is introduced, a non-scanning laser Compressive sensing (CS) is a new theory of signal acquisition and processing emerged in recent years, which can sample signals at a rate much lower than the Nyquist sampling rate and implement high precision reconstruction of the signals. At first, the theory of compressive sensing is introduced, a non-scanning laser radar imaging system based on CS is proposed. And then, the composition and workflow of the system are introduced in detail, the key technologies are analyzed. The imaging system uses a single-photon point-type detector as an ultralow light target detector to achieve the super-resolution imaging of an ultralow light target through the spatial light modulation and image reconstruction techniques. And at last, orthogonal matching pursuit (OMP) reconstruction algorithm is used to simulate and validate in MATLAB platform and the feasibility of the imaging system is proved..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 25 (2018)
Effect of Fitting Order on Phase-height Mapping Based on Polynomial Fitting
WAN An-jun, and ZHAO Xun-jie
The calibration of phase-height mapping system plays a decisive role in the accuracy of three-dimensional reconstruction and detection of phase measurement profilometry. The influence of fitting order on the calibration accuracy of phase-height mapping system based on polynomial fitting is mainly studied. Through the cThe calibration of phase-height mapping system plays a decisive role in the accuracy of three-dimensional reconstruction and detection of phase measurement profilometry. The influence of fitting order on the calibration accuracy of phase-height mapping system based on polynomial fitting is mainly studied. Through the calibration of one to six orders polynomial fitting and three-dimensional height reconstruction, it is found that the fitting height of one to four orders can achieve a good height reconstruction accuracy, and the absolute error Δ is less than 5 μm.The polynomial fitting calibration coefficients of one to four orders are further studied and analyzed. It is found that when the fitting order is two, it has higher reconstruction accuracy and stability, and the absolute error Δ is 1.36 μm the relative error δ is 1.34% and the standard deviation is 0.262..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 29 (2018)
Discuss of Space-mapping Based Image Stitching Algorithm
WANG Heng-li, and ZHANG Qiang
Space-mapping based image panorama stitching algorithm is proposed to solve the problems that the results of the traditional image panorama stitching algorithms have low accuracy and obvious seams. At first, the image distortion center and lens distortion parameters from each camera are measured, and the ideal image wiSpace-mapping based image panorama stitching algorithm is proposed to solve the problems that the results of the traditional image panorama stitching algorithms have low accuracy and obvious seams. At first, the image distortion center and lens distortion parameters from each camera are measured, and the ideal image with specified size of field of view is obtained by image distortion correction processing. And then, the actual installation location of each camera is calculated by using the similarity of overlapping field region of view of the adjacent cameras. The accuracy of image stitching is improved and image stitching seams is removed using brightness uniformity processing and boundary fusion methods. At last, according to actual installation location of each camera, the field of view and image resolution, panorama image is obtained by calculating image stitching table. Experimental results show that the algorithm has high stitching accuracy and the stitching images are seamless and smooth..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 35 (2018)
A Technology of Quick Anti-camouflage Recognition Based on Hyper-spectral Image
ZHANG Yu-jia, and WEI Jun-jie
A quick anti-camouflage recognition technology based on hyper-spectral image is proposed for resolving the problem that the target is not easy to be extracted accurately and effectively with traditional infrared and visible light single wavelength reconnaissance methods under complex camouflage background. At first, thA quick anti-camouflage recognition technology based on hyper-spectral image is proposed for resolving the problem that the target is not easy to be extracted accurately and effectively with traditional infrared and visible light single wavelength reconnaissance methods under complex camouflage background. At first, the collected data of multi-spectral image in real time is registered and fused to obtain hyper-spectral images. And then, the fused images are enhanced by digital detail enhancement (DDE) technology and image details are effectively highlighted. At last, the methods of threshold segmenting and connectivity area abstracting of the enhanced image are used to obtain the targets of interest. Experimental results show that the method has better real time and less consumption of central processing unit (CPU) resources. It can quickly and clearly distinguish the targets such as buildings and campus under complex camouflage background, which is difficult to detect for single wavelength methods..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 39 (2018)
Key Techniques of Real Time Signal Processing for 640×512 MWIR Imaging System
WANG Xiao-jie, and ZHANG Ting-yu
The factors affecting the image quality of refrigerating medium wave infrared (MWIR) focal plane detectors include non-uniformity of response, drift characteristics of response and blind pixel. So signal processing in real time such as non-uniformity correction, drift compensation and blind pixel substitution is requirThe factors affecting the image quality of refrigerating medium wave infrared (MWIR) focal plane detectors include non-uniformity of response, drift characteristics of response and blind pixel. So signal processing in real time such as non-uniformity correction, drift compensation and blind pixel substitution is required in infrared focal plane imaging system. At first, a refrigerating MWIR image system with high frame frequency, low noise and 640×512 pixels is designed. And the dynamic range is calibrated to implement the NETD≤ 30 mK in full dynamic range. And then, according to the response characteristics of the pixels in the focal plane, the non-uniformity and blind pixel correction method suitable for the infrared imaging system are researched. A non-uniformity correction, blind pixel detection and substitution algorithm based on radiation calibration and scene fusion is put forward. At last, the infrared image data is collected in field experiment. Experimental results show that the method has a good image correction effect, easy to be implemented, and it has strong environmental adaptability..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 42 (2018)
Influence of Different Measurement Matrix Based on TVAL3 Algorithm on Image Reconstruction Quality
LI Hui-bin
Compressive sensing reconstruction is the process of recovering the original signal using the obtained random measurement values. Because the signal is sparse or compressible, the solution of the compressed sensing problem is the process of finding the sparsest solution of the equation. At first, the construction methoCompressive sensing reconstruction is the process of recovering the original signal using the obtained random measurement values. Because the signal is sparse or compressible, the solution of the compressed sensing problem is the process of finding the sparsest solution of the equation. At first, the construction method of six measurement matrices is given. And then, a reconstruction method TVAL3 of high quality reconstruction signal is introduced, and four assessment parameters of image reconstruction quality are given. At last, the influence of different measurement matrix on image reconstruction quality is simulated..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 48 (2018)
Design and Implementation of Signal Quality Testing System of 1394B Bus
HU Liang, and ZHANG Zhi-wei
With the widely application of 1394 bus in the field of airborne, taking account of low cost and flexibility, a complete set of 1394 bus signal quality testing system is needed to be established for the process of configuration, simulation, testing, monitoring and test. The signal quality testing for product module levWith the widely application of 1394 bus in the field of airborne, taking account of low cost and flexibility, a complete set of 1394 bus signal quality testing system is needed to be established for the process of configuration, simulation, testing, monitoring and test. The signal quality testing for product module level and system level can be realized by the reliable bus signal quality testing system, at the same time, the development cycle of the system is shortened and the development cost is saved greatly. A 1394 bus signal quality testing system design scheme is proposed. Based on the full understanding of 1394 bus protocol, the hardware, software and testing architectures, the design and implementation of 1394 bus signal quality testing system are introduced, which can provide reliable technical guarantee for the development and verification of the airborne equipment based on 1394B bus communication..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 52 (2018)
Research on Infrared Scene Built by Computer
TANG Shu-wei, and GAO Bo
The aim of infrared scene built by computer is generating infrared image using the basic principle of infrared physics and computer technology in order to research and test the characteristics of infrared systems. Based on the infrared imaging simulation of typical scenes, researches about the thermal models and infrarThe aim of infrared scene built by computer is generating infrared image using the basic principle of infrared physics and computer technology in order to research and test the characteristics of infrared systems. Based on the infrared imaging simulation of typical scenes, researches about the thermal models and infrared images of the key components such as terrain, sky and cloud are researched. The main works include the composition and the detailed architecture of the scene, the method and steps of the components building. And the whole infrared scene is built. The atmospheric attenuation affecting infrared scene effect is analyzed. Simulation results are evaluated and analyzed to point out the characteristics of this method..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 58 (2018)
Electromagnetic Compatibility (EMC) Design and Testing Technology of High Intensity Radiation Field
WU Yi-chao
Under the current development situation of electro-optical equipments, the new requirements for systems in complex electromagnetic environment are introduced, especially the new requirements for the development and verification of electro-optical systems from high intensity radiation field. The engineering design methoUnder the current development situation of electro-optical equipments, the new requirements for systems in complex electromagnetic environment are introduced, especially the new requirements for the development and verification of electro-optical systems from high intensity radiation field. The engineering design method of electromagnetic shielding is introduced. Incorporated with engineering practice, an engineering method of electromagnetic shielding effectiveness verification is presented. Two methods of shielding effectiveness verification are carried out based on the experiment testing and field testing methods. And linear extrapolation mode is introduced. The shielding design method has been verified in applications. Especially the shielding effectiveness verification method under high intensity radiation field has a strong guiding significance to the subsequent electro-optical equipment verification under complex environments..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 62 (2018)
Application of Wavelet Transform in Rigidity Characteristic Measurement of Quartz Reed
BI Xue-mei, and HAO Ben-gong
Rigidity is a key index to the quality of quartz reed, and the vibration characteristic of the quartz reed is a key parameter reflecting its rigidity. For the different component separation problem of signal before executing precise frequency estimation in rigidity measurement of quartz reed with laser triangulation, tRigidity is a key index to the quality of quartz reed, and the vibration characteristic of the quartz reed is a key parameter reflecting its rigidity. For the different component separation problem of signal before executing precise frequency estimation in rigidity measurement of quartz reed with laser triangulation, the wavelet transform is used as a profiling tool to implement the separation of free vibration signal and reverse vibration signal. Experimental results show that it is an effective method in the rigidity measurement of quartz reed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 65 (2018)
Research on Smoke Obscuring Ratio Testing Method Based on Infrared Imaging Detector
ZHOU Li-cun, and LI Bin
The obscuring ratio is an important parameter to assess the smoke obscuring performance, two methods for testing the obscuring ratio of infrared smoke are proposed, which are the temperature contrast method based on single blackbody and the electrical level difference method based on double blackbody. The testing princThe obscuring ratio is an important parameter to assess the smoke obscuring performance, two methods for testing the obscuring ratio of infrared smoke are proposed, which are the temperature contrast method based on single blackbody and the electrical level difference method based on double blackbody. The testing principles of the two methods are analyzed and experimental verification is performed. According to analysis and comparison, the test error is less than 3.5% and the scenarios suitable for the two methods are presented..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 70 (2018)
Detection Method of Multi-pulsed Laser Rangefinder
FENG Ji-dong
Pulsed laser ranging technology is widely used in military, civil and other fields for its high ranging accuracy and simple operation. In order to further improve the maximum range of a laser rangefinder, a multi-pulsed laser rangefinder has been developed in recent years. According to the advantages and disadvantage oPulsed laser ranging technology is widely used in military, civil and other fields for its high ranging accuracy and simple operation. In order to further improve the maximum range of a laser rangefinder, a multi-pulsed laser rangefinder has been developed in recent years. According to the advantages and disadvantage of the testing methods of previous pulsed laser ranging systems, in view of the multiple-pulsed rangefinder ranging principle, a multiple-pulsed laser rangefinder detection method is proposed. The problems of high requirements for testing places, complex processes and atmospheric visibility for previous testing are effectively solved..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 74 (2018)
Application of Thin-walled Shell Structure of Carbon Fiber Composite Material for Electro-optical Equipment
LI Wei, and HOU Yang
The carbon fiber composite material is used for the requirements of the environment and weight reduction for the electro-optical platform equipment. Based on two kinds of methods of theoretical calculation and finite element analysis about material performances, the thin-walled shell test structure performance of the cThe carbon fiber composite material is used for the requirements of the environment and weight reduction for the electro-optical platform equipment. Based on two kinds of methods of theoretical calculation and finite element analysis about material performances, the thin-walled shell test structure performance of the carbon fiber composite material is compared, the correctness of two methods are verified, which provides a theoretical support for the thin-walled shell structural design of the carbon fiber composite material. The two methods are used to design the thin-walled shell product of the carbon fiber composite material. Through testing the structure performances of the product, the reliability of the theoretical calculation and finite element simulation analysis are confirmed, which have higher application value in the structural design of the thin-walled shell of the carbon fiber composite material..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue 3, 79 (2018)
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