Journals >Electro-Optic Technology Application
Contents
2011
Volume: 26 Issue 2
21 Article(s)
Export citation format
Research Article
Method of Electro-optic Stealth Effect Evaluation
DU Cui-lan, and ZHOU Jian-zhong
Based on the meaning of electro-optic stealth technology, the characterization methods of IR stealth and laser stealth are introduced, and the characteristics of stealth materials are analyzed. The measurement and evaluation of electro-optic stealth effect are discussed, based on the property characterization method anBased on the meaning of electro-optic stealth technology, the characterization methods of IR stealth and laser stealth are introduced, and the characteristics of stealth materials are analyzed. The measurement and evaluation of electro-optic stealth effect are discussed, based on the property characterization method and application of electro-optic stealth. The methods for field measurement and effect evaluation of laser stealth and IR stealth are proposed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 1 (2011)
Line of Sight Stabilization Algorithms Based on Coordinate Transformation
Li Da-cheng, and ZHAO Hong-bin
The system structure and working principle of the vehicle-mounted line of sight (LOS) stabilization system are introduced. The method for how to eliminate the installation error between the navigation device and turret is proposed, and then two LOS stabilization algorithms of dual-axis servo turret based on coordinate The system structure and working principle of the vehicle-mounted line of sight (LOS) stabilization system are introduced. The method for how to eliminate the installation error between the navigation device and turret is proposed, and then two LOS stabilization algorithms of dual-axis servo turret based on coordinate transformation and inverse coordinate transformation are presented, the corresponding control schemes are also given. The accuracy of the algorithm is proved through the successful application of the actual system..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 5 (2011)
Discussion on Terahertz Against Plasma Stealth Technology
LI Qian, XU Sheng, LIU Shao-chong, and WANG Gao
The plasma stealth technology is a new branch of the stealth technology. The plasma refractive stealth and absorption stealth characteristic are discussed in the analysis of stealth mechanism of the plasma. The high penetration, high resolution and anti-stealth capabilities of terahertz radiation are studied. Based on The plasma stealth technology is a new branch of the stealth technology. The plasma refractive stealth and absorption stealth characteristic are discussed in the analysis of stealth mechanism of the plasma. The high penetration, high resolution and anti-stealth capabilities of terahertz radiation are studied. Based on the limit of the plasma stealth technology, the feasibility and technical approach using terahertz radar to detect the plasma stealth aircraft are proposed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 9 (2011)
Design of 3D Model Reconstruction System Based on Stereovision
ZHAO Juan, ZENG Qiang, WEI Lin-yuan, and YANG Wei
The technology of 3D reconstruction based on stereovision is researched by using computer vision theory. In the early time, 3D reconstruction was limited by the level of theoretical research, the modeling process required special equipment such as vision coordinate measuring machine to achieve and the movement of camerThe technology of 3D reconstruction based on stereovision is researched by using computer vision theory. In the early time, 3D reconstruction was limited by the level of theoretical research, the modeling process required special equipment such as vision coordinate measuring machine to achieve and the movement of camera is severely restricted. The 3D reconstruction is performed on non- specific model by ordinary digital camera in the non-specific circumstances. The system is practical and simple and can accurately restore the three-dimensional information such as the location or geometric of the object, which cannot provide by two-dimensional image detection method..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 12 (2011)
Tm Pulse Laser Pumped Mid-IR Solid State Laser
ZHANG Xiao-juan, CAI Jun, XU Hong, and YANG Hai-bo
A Tm:YAP laser pumped Mid-IR solid-state laser is reported. First, the Tm pulse laser is described, the structure of laser cavity is optimized by analyzing the experiment results. Then, the appropriate type of YAP laser cavity of ZnGeP 2 OPO pump is confirmed, and obtained 2 μm pulse laser output is ideal. Mid-IR solidA Tm:YAP laser pumped Mid-IR solid-state laser is reported. First, the Tm pulse laser is described, the structure of laser cavity is optimized by analyzing the experiment results. Then, the appropriate type of YAP laser cavity of ZnGeP 2 OPO pump is confirmed, and obtained 2 μm pulse laser output is ideal. Mid-IR solid state laser is composed of optimized Tm:YAP laser pump optical parametric oscillator (OPO). Finally, more than Watt-level output power at 3～5 μm is obtained..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 15 (2011)
Simulation of Laser Propagation Characteristic in Complex Atmospheric Environment
ZHAO An-xin, and ZHAO Tong-gang
As development of laser technology, the characteristic of laser atmospheric propagation is always hot spot in laser domain. Integrating Lambert-Beer law of laser atmospheric propagation, combining Rayleigh scattering and Mie scattering, a simulation system is designed. This simulation system can simulate the course of As development of laser technology, the characteristic of laser atmospheric propagation is always hot spot in laser domain. Integrating Lambert-Beer law of laser atmospheric propagation, combining Rayleigh scattering and Mie scattering, a simulation system is designed. This simulation system can simulate the course of laser propagation in complex atmosphere. In order to obtain the final optical field through the atmosphere turbulence, the random disturbance could be simulated by a series phase screen which is based on Fourier transform. Lastly, the figure of light spot is drawn along with transmission ranges..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 18 (2011)
Design of Coaxial Three-mirror Infrared Optical System for Space Camera
YUAN Tao, XIONG Yan-jian, and WU Han-ping
The developing trend and characteristics of the space optical system are long focal length, large view field, light weight, small dimension, large relative aperture and high image quality. The structural parameters of the coaxial three-mirror system can be solved and optimized by ZEMAX. The coaxial three-mirror system The developing trend and characteristics of the space optical system are long focal length, large view field, light weight, small dimension, large relative aperture and high image quality. The structural parameters of the coaxial three-mirror system can be solved and optimized by ZEMAX. The coaxial three-mirror system with focal length of 5 000 mm and F number of 10 is designed. The result indicates that the field of view of the system is 8°, and MTF is higher than 0.4 at 50 lp /mm. The image quality of the optical system approaches the diffraction limit, and can meet the different requirements of high-resolution space camera. This design has a theoretical guidance and significance for the design and selection of structure as well as manufacture of space camera IR optical system..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 21 (2011)
Coherent Beam Combining Technology of High Power Fiber Laser
PENG Hui
With the increase of output power and beam quality of fiber laser, the applications of high power fiber laser continue to expand. The beam combining technology is an effective way for increasing the output power of fiber laser. The theories of non-coherent beam combination and coherent beam combination are analyzed, anWith the increase of output power and beam quality of fiber laser, the applications of high power fiber laser continue to expand. The beam combining technology is an effective way for increasing the output power of fiber laser. The theories of non-coherent beam combination and coherent beam combination are analyzed, and the numerical simulation is done. The new progress of coherent beam combination is summarized, which offers the reference to the coherent beam combination of fiber laser..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 27 (2011)
Fitting Accuracy of Wavefront Using Zernike Polynomials
FENG Jie, BAI Yu, and XING Ting-wen
The vast majority of cases in optical surface testing，the output surface of measured optical surface or optical system always tends to be smooth and continuous, such wavefront functions must can be expressed as a complete the linear combination of the basement function. Zernike polynomials are often used as basic set oThe vast majority of cases in optical surface testing，the output surface of measured optical surface or optical system always tends to be smooth and continuous, such wavefront functions must can be expressed as a complete the linear combination of the basement function. Zernike polynomials are often used as basic set of polynomials for the fitting of measured discrete data. The wavefront and curved surface are interpreted in the form of linear combinations of Zernike polynomial. The effects of fitting precision owing to Zernike polynomials order and sampling points are studied. The result is obtained that higher order Zernike polynomial fitting wavefront is not better，if order more than a certain range，fitting results will appear sick. Therefore, the wavefront fitting should choose appropriate order of Zernike polynomial. When the polynomial order is selected, more sampling points will help improve fitting accuracy. However，the number of sampling points is not a prerequisite for improving the fitting precision..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 31 (2011)
Theory and Experiment of Influence of Chromatic Aberration on Cat-eye System Echo
DOU Xian-an, SUN Xiao-quan, and ZHANG Chuang-xin
Using optical window cat-eye effect, the laser active detection is easily influenced by laser wavelength. A chromatic aberration theoretical model of the transmission-type cat-eye effect is established. The detecting laser wavelength doesn’t match with the operating band of transmission-type cat-eye system, which generUsing optical window cat-eye effect, the laser active detection is easily influenced by laser wavelength. A chromatic aberration theoretical model of the transmission-type cat-eye effect is established. The detecting laser wavelength doesn’t match with the operating band of transmission-type cat-eye system, which generates the chromatic aberration, so the influence of chromatic aberration on laser active detection is analyzed. An experiment is designed to validate the theoretical analysis results. The results indicate that the generated chromatic aberration results in the focus shift, the echo divergence angle is obviously increased and the received echo power is decreased. The conclusion is that the detecting laser wavelength should match with the operating band of the transmission-type cat-eye system..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 35 (2011)
Analysis and Calculation for Operating Range of IRST System
YAN Shi-hua, and ZHU Shi-jie
For the influence of environment effects on infrared search and track (IRST) system, the traditional operating range equation is changed in expression after analyses the parameters which relate to the environment. In the new operating range equation, the noise equivalent power (NEP) measures all noise power including eFor the influence of environment effects on infrared search and track (IRST) system, the traditional operating range equation is changed in expression after analyses the parameters which relate to the environment. In the new operating range equation, the noise equivalent power (NEP) measures all noise power including environment noise. Based on the statistic characteristics of the signal and noise in digital image, the NEP can be calculated by the detector’s sensitivity. As a result, the operating rang of infrared system can be calculated in different applications. By analyzing the experiment, the conclusion is that comparing with traditional operating range equation, the results of improved operating range equation are more closer to the actual operating range..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 39 (2011)
Method to Improve Accuracy of Pulse Laser Ranging
ZHU Fu, and LIN Yi-nan
The principle of pulse laser ranging is introduced, the two main reasons such as pulse time discrimination error and time interval measurement error, which affect the pulse laser ranging accuracy are analyzed. Aiming at the solution of above two reasons, a higher accuracy method is provided, which uses CR-high pass timThe principle of pulse laser ranging is introduced, the two main reasons such as pulse time discrimination error and time interval measurement error, which affect the pulse laser ranging accuracy are analyzed. Aiming at the solution of above two reasons, a higher accuracy method is provided, which uses CR-high pass time discrimination and differential delay line time interval measurement, and its working principle is introduced..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 42 (2011)
Development of Type-II Superlattices for Very Long Wavelength Infrared Detector
WANG Yi-feng, YU Lian-jie, and QIAN Ming
Type II superlattce (T2SL) photodetectors, which is composed of III-V semiconductor materials InAs/GaSb or InAs/Ga1-xInxSb, have experienced significant improvements in both theoretical structure design and experimental device realization in the past few years. The bandgap engineering and band structure engineering proType II superlattce (T2SL) photodetectors, which is composed of III-V semiconductor materials InAs/GaSb or InAs/Ga1-xInxSb, have experienced significant improvements in both theoretical structure design and experimental device realization in the past few years. The bandgap engineering and band structure engineering provides T2SL with some advantages over mercury cadmium telluride materials, particularly for very narrow band gaps. These inherent properties, such as a higher effective electron mass and large separation of the heavy and light-hole bands to suppress Auger recombination, make them an attractive material for very long wavelength infrared (VLWIR) detectors. By summarizing and analyzing of related papers published in recent years, an overview on issues in the development of T2SL/VLWIR detectors is provided, such as basic concepts, structure, performance optimization, numerical modeling, electronic properties and etc..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 45 (2011)
Research on Band-gap of One-dimensional Complex-periodic Holographic Photonic Crystals
CHENG Yang, and CUI Li-bin
The band-gap of one-dimensional complex-periodic holographic photonic crystals is calculated by using transfer matrix method. Aiming at the dichromate gelatin recording medium, band-gaps are found in this refractive medium structure, and the effects of the refractive index, refractive index modulation and thickness of The band-gap of one-dimensional complex-periodic holographic photonic crystals is calculated by using transfer matrix method. Aiming at the dichromate gelatin recording medium, band-gaps are found in this refractive medium structure, and the effects of the refractive index, refractive index modulation and thickness of the medium on the photonic gaps are discussed. When the light is shining, using calculating to find that the refractive index and refractive index modulation changes does not affect the position of the band-gap, the width of the band-gap decreases with the increase of the refractive index of the recording medium, and increases with the increase of the refractive index modulation. To get a good band-gap, the thickness of the recording medium is at least 8 μm..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 53 (2011)
Sensing Head Materials of High Temperature Optical Fiber Sensor
WEI Lin, WANG Gao, GAO Zhi-qiang, ZENG Qiang, and ZHAO Hui
Thermal radiation high temperature optical fiber sensor is a device sensing temperature based on the phenomenon of blackbody radiation generated by the hotspot in the core of optical fiber. The material of sensing head is the key to the sensor. Three kinds of materials for sensing head are presented via theoretical anaThermal radiation high temperature optical fiber sensor is a device sensing temperature based on the phenomenon of blackbody radiation generated by the hotspot in the core of optical fiber. The material of sensing head is the key to the sensor. Three kinds of materials for sensing head are presented via theoretical analysis for principle of thermal radiation temperature measurement, illustration of the working principle of high temperature optical fiber sensor and the characteristics of materials of sensing head. The structures and performance of these materials are further researched, particularly for the material of zirconia crystal sensing head for superhigh temperature detecting..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 56 (2011)
Realization of Relationship Matrix Based on Error Threshold and Least Squares Method in Image Mosaic
ZHAO Xiu-ying, WANG Hong-yu, YANG Zi-long, and ZHOU Hai-shen
In order to get the most mosaic effect, the transformation matrix between adjacent images be studied for solving the problem, a robust image mosaic algorithm is presented. In this algorithm, SIFT is used to extract feature points. Then, a pseudo-matching set is obtained by comparing local neighborhoods of features throIn order to get the most mosaic effect, the transformation matrix between adjacent images be studied for solving the problem, a robust image mosaic algorithm is presented. In this algorithm, SIFT is used to extract feature points. Then, a pseudo-matching set is obtained by comparing local neighborhoods of features through intensity cross correlation method and these pseudo matches are divided into inliers and outliers using robust error threshold set to false matches. In the inliers, the use of the smallest squares optimization algorithm to accurately estimate the point transformation matrix between the two images. In the end, the image color of the overlapping band is smoothed with bilinear interpolation technique. The whole algorithm filters the noisy or wrong input data iteratively, estimates the model parameters through pure data, so it has strong error-tolerant capacity for the image noise and inaccuracy of feature extraction. When estimating the model parameters, the energy function is constructed based on the position errors of features instead of the features’intensity errors, which conquers the original methods’shortcoming of sensitivity to illuminating conditions and makes this algorithm more practical. Experimental results show that the image mosaic effect is wonderful and the algorithm is stable very much. It is high valuable in practice..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 61 (2011)
FPGA Implementation for Improved Median Filtering Algorithm Based on IRFPA
YANG Shao-yan, LIU Wan-cheng, and ZHOU Chang-chun
The median filtering is a nonlinear signal processing technology based on the order statistical theory, it can effectively suppress the noise. The improved median filtering algorithm and the traditional 3×3 median filter are compared: the filtering mould board is composed of 2 FIFOs and 7 registers, simple and praThe median filtering is a nonlinear signal processing technology based on the order statistical theory, it can effectively suppress the noise. The improved median filtering algorithm and the traditional 3×3 median filter are compared: the filtering mould board is composed of 2 FIFOs and 7 registers, simple and practical; by using 6-level comparison, 9 medians are found fast, which can improve the speed of finding median; in order to keep the image details, the obtained median and the original data are compared with the threshold to selectively replace. Using the algorithm, 3×3 window successfully achieves the median filtering of the image on the 640×512 element infrared focal plane array (IRFPA). This algorithm is simple and fast, it can protect the signal details well at the same time of filtering the noise, especially the pulse noise..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 64 (2011)
Instantaneous Frequency Estimation of Ionospheric Echo Signal
LI Qiong, YU Zhi-hui, LENG Yi, and SHI Zi-yan
In the detection and study of ionosphere, the instantaneous Doppler frequency can indicate the changes that the Doppler effect changes over time, to reflect the change law of ionosphere. Using the two instantaneous frequency estimation methods of the phase difference and phase modeling, the echo signal for actual ionosIn the detection and study of ionosphere, the instantaneous Doppler frequency can indicate the changes that the Doppler effect changes over time, to reflect the change law of ionosphere. Using the two instantaneous frequency estimation methods of the phase difference and phase modeling, the echo signal for actual ionospheric oblique backscattering sounding system is simulated and analyzed. The results show that the phase modeling can more accurately reflect the change law of the ionosphere..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 68 (2011)
Design and Research of TEA CO2 Laser Charging Power Supply with Series Resonant Mode
SI Han-ying, and GAO Wen-qing
The series resonant technology of TEA CO2 laser charging power supply is introduced. The working principle of the full bridge series resonant converter is mathematically analyzed. In the charging circuit, the relationship between the transient state, average charging currents and the parameters of the resonant componenThe series resonant technology of TEA CO2 laser charging power supply is introduced. The working principle of the full bridge series resonant converter is mathematically analyzed. In the charging circuit, the relationship between the transient state, average charging currents and the parameters of the resonant components is derived. Using the integrated chip SG3525 and IR2110, the high efficiency and practical charging power supply to fit the high voltage and high power TEA CO2 laser is designed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 71 (2011)
Multi-channels Data Acquisition System Based on CPLD
ZHANG Xiao-mei, and FENG Yan-jun
Data acquisition technology is an important branch of information science, and is the foundation of modern measurement technology with sensor, signal processing and computer technology. The solution scheme, constitution and characteristics of data acquisition system are described. This acquisition system consists of saData acquisition technology is an important branch of information science, and is the foundation of modern measurement technology with sensor, signal processing and computer technology. The solution scheme, constitution and characteristics of data acquisition system are described. This acquisition system consists of sample-and-hold device, AD converter, CPLD, USB control chip and software design. Using Altera EPM7128 as the core of the controller, a multi-channels data acquisition system based on CPLD is designed, the data can be transmit fast via USB interface. The system can achieve 16 channels input of analog quantities, and the resolution of every channel is 14 bit, the data acquisition rate is 16 Ksps..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 76 (2011)
Design of Intelligent Single-phase Motor Protector Based on Single-chip Microcomputer
LIN Yu-ming
The intelligent single-phase motor protector is constructed by current transformator, voltage transformator and single-chip microcomputer. Its working principle, circuit composing and software design flow are introduced. The design uses the characteristics of super anti-jamming and precise control for STC12C5A60S2 singThe intelligent single-phase motor protector is constructed by current transformator, voltage transformator and single-chip microcomputer. Its working principle, circuit composing and software design flow are introduced. The design uses the characteristics of super anti-jamming and precise control for STC12C5A60S2 single-chip microcomputer. Combining DC sampling circuit, the protector can cut off the power supply quickly and alarm when the operating current of voltage exceed the given ranges. It has the advantages of simple configuration, quick reaction, stabilization and reliability, so it can be applied to the voltage fluctuation and unwatched environment..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 2, 80 (2011)
© Copyright 2018-2021 | Chinese Laser Press. All Rights Reserved 沪ICP备15018463号-20