Journals >Electro-Optic Technology Application
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2021
Volume: 36 Issue 6
15 Article(s)
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Overview of High Energy Laser Weapon Development in USA (Invited)
DING Yu, JIANG Feng, ZHENG Rongshan, and ZHANG Jie
Laser weapons have become an important means for great powers to balance and change the pattern of war in the future. The tactical high energy laser weapon is rapidly entering the actual combat application stage. At first, the development history of high energy laser weapons in the United States is summarized, the key Laser weapons have become an important means for great powers to balance and change the pattern of war in the future. The tactical high energy laser weapon is rapidly entering the actual combat application stage. At first, the development history of high energy laser weapons in the United States is summarized, the key technologies are analyzed. And then, the development of the high energy laser weapons in the United States from ship-borne, airborne, vehicle-mounted platforms and missile defense agency is summarized. At last, the development trend is forecasted. It is expected to provide references for the developments and applications of laser weapons..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 1 (2021)
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 1 (2021)
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 1 (2021)
Research on Integrated Optical System Technology of Receiving and Transmitting for Near Ground Ultraviolet Communication
LUO Hui, LI Jie, LI Jincheng, and WU Hanping
In order to improve the performances of near ground ultraviolet communication system, one of the key problems is to study the technology of integrated optical system with lightweight, low cost, integration and high reliability. At first, from the point of designing the integrated optical system, the near ground ultraviIn order to improve the performances of near ground ultraviolet communication system, one of the key problems is to study the technology of integrated optical system with lightweight, low cost, integration and high reliability. At first, from the point of designing the integrated optical system, the near ground ultraviolet communication system’s composition and working principle are briefly introduced. And then, the structure, material and alignment method of the integrated optical system are emphatically analyzed and discussed. At last, on the basis of summarizing the research situation of ultraviolet communication optical system at home and abroad, the development trend of ultraviolet communication receiving and transmitting optical system technology is prospected, which has a certain theoretical guidance and significance for the further research of the near ground ultraviolet communication receiver and transmitter integrated optical system..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 10 (2021)
Research Progress of TDLAS in Atmospheric Detection
LIU Qi, WANG Zhenyu, and CHEN Jin
Tunable diode laser absorption spectroscopy (TDLAS) technology is widely used in atmospheric environment monitoring, combustion diagnosis and other fields. It has the advantages of high sensitivity, high selectivity, fast response, adapting to harsh environment, multi-component real-time on-line monitoring and so on. TTunable diode laser absorption spectroscopy (TDLAS) technology is widely used in atmospheric environment monitoring, combustion diagnosis and other fields. It has the advantages of high sensitivity, high selectivity, fast response, adapting to harsh environment, multi-component real-time on-line monitoring and so on. Taking the application of TDLAS technology in atmospheric environment detection as an example, according to the different ways of gas detection based on TDLAS technology, it is divided into direct absorption spectroscopy (DAS), frequency modulation spectroscopy (FMS) and wavelength modulation spectroscopy (WMS). The high sensitive modulation spectroscopy technology is introduced, and the research progress and development trend of TDLAS in the field of atmospheric environment detection are briefly reviewed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 24 (2021)
Design of Super Continuum Spectrum Light Source Based on PCF
QIN Liangbiao, CHENG Fang, LU Zheng, FU Yi, ZHANG Xin, and WANG Xia
In order to obtain super wide spectrum by using the high nonlinearity effect of PCF, a super continuum light source based on photonic crystal fiber (PCF) is designed. The narrow line width pulse light with high peak power is injected into the high nonlinear PCF by the way of hole collapse and re-melting, and the spectrIn order to obtain super wide spectrum by using the high nonlinearity effect of PCF, a super continuum light source based on photonic crystal fiber (PCF) is designed. The narrow line width pulse light with high peak power is injected into the high nonlinear PCF by the way of hole collapse and re-melting, and the spectrum broadening is realized by using the nonlinear effect of the fiber. Experimental results show that the spectrum range of the source is achieved 440~2 400 nm and the output power is 276 mW..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 28 (2021)
Design of Ultraviolet System for Hemispherical Annular Panoramic Imaging
SUN Hongyu, LI Xin, LU Xin, SUN Bing, and LAN Xirui
An ultraviolet optical system based on hemispherical circular panoramic imaging is described. From the perspective of the demand for large field of view, a circular imaging system is designed. The system can realize the demand of imaging coverage in 180° (H)×40°(V) airspace, which is suitable to ultravioAn ultraviolet optical system based on hemispherical circular panoramic imaging is described. From the perspective of the demand for large field of view, a circular imaging system is designed. The system can realize the demand of imaging coverage in 180° (H)×40°(V) airspace, which is suitable to ultraviolet imaging. Coated foldback design is used in the first lens in order to reduce aberration for less system material at ultraviolet, which expands the receiving range of the field of view and reduces the number of lens. The system has small volume, wide coverage area and high imaging quality, and the acquisition of ultraviolet image in circular large field of view is realized effectively..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 32 (2021)
Multi-wavelength Linear Cavity Thulium-doped Fiber Laser Based on Sagnac Loop Mirror (Invited)
ZHOU Lewen, ZHU Decai, XU Pengbai, HUANG Changqing, and DONG Xinyong
A multi-wavelength linear cavity thulium-doped fiber laser based on fiber Sagnac loop mirror is studied. A 1.5 m long double-clad thulium-doped fiber is used as the gain medium, and a 793 nm laser diode is used as the pump source. The fiber Sagnac loop mirror and the fiber ring mirror constitute the laser resonant caviA multi-wavelength linear cavity thulium-doped fiber laser based on fiber Sagnac loop mirror is studied. A 1.5 m long double-clad thulium-doped fiber is used as the gain medium, and a 793 nm laser diode is used as the pump source. The fiber Sagnac loop mirror and the fiber ring mirror constitute the laser resonant cavity. By increasing the pump power and adjusting the polarization controller, laser outputs with 1~7 wavelengths are realized within the spectral range between 1 949 and 1 976 nm. The output power is on the order of milliwatts, and the optical signal-to-noise ratio reaches 40~50 dB..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 35 (2021)
Research on Far-field Characteristics of One-dimensional Coherent Array Semiconductor Laser Beam
LI Wei, YE Zhengyu, WEN Congyang, DAI Jingjing, LAN Tian, and WANG Zhiyong
The beam propagation characteristics of a one-dimensional coherent array semiconductor laser in the far field are researched. By establishing a mathematical physical model, the laser beam intensity distribution in the far field of a one-dimensional coherent array laser is calculated and simulated. The influence of arraThe beam propagation characteristics of a one-dimensional coherent array semiconductor laser in the far field are researched. By establishing a mathematical physical model, the laser beam intensity distribution in the far field of a one-dimensional coherent array laser is calculated and simulated. The influence of array length, wavelength and duty ratio on the spot width in the fast and slow axis of the coherent array at different distances is analyzed. Research results show that the optical field of one-dimensional coherent semiconductor laser array is affected by the coherent action of the sub-source in the slow axis direction. The spot width in the slow axis direction differs by about 4 orders of magnitude compared with that in the fast axis direction in the far field. Thus, the laser spot is distributed in the shape of “blade”..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 40 (2021)
Novel Photoelectric Memristor Based on PVK/ZnO Heterostructure
YIN Yue, QI Haobo, and LIU Lei
In recent years, researchers have proposed a variety of photoelectrical memristor structures to simulate light-synapse in living organisms through continuous research and innovation, which are used in the field of neuromorphic computing. Among them, organic photoelectric memristor devices have the characteristics of loIn recent years, researchers have proposed a variety of photoelectrical memristor structures to simulate light-synapse in living organisms through continuous research and innovation, which are used in the field of neuromorphic computing. Among them, organic photoelectric memristor devices have the characteristics of low cost, simple preparation process and high flexibility, and have gradually become a research hotspot in this field, attracting more and more researchers. The organic polymer PVK (polyvinylcarbazole), its functional layer material PVK organic photoelectric mersister, has excellent photovoltaic performance and high hole mobility, but it has poor stability and low repeatability due to the unclear mechanism of organic resistance transformation and poor material stability. Based on Al/PVK/W/Si photoelectric memristor, zinc oxide functional layer with high stability and high electron mobility is introduced to improve the related performance of PVK photoelectric memristor. The prepared Al/PVK/ZnO/W/Si photoelectric memristor is tested in detail, and is compared with the traditional Al/PVK/W/Si photoelectric memristor. The experimental results show that the stability of the new structure is significantly improved, and the repeatability is enhanced..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 45 (2021)
Analysis of Situation and Problems of Chaff Jamming at Home and Abroad
YANG Shuo, and LIU Zhicheng
Chaff Jamming plays an irreplaceable role in radar passive countermeasures. At the same time, the theory, methods and effectiveness of chaff jamming is urgent needed to be researched in-depth for the development of equipments. Based on the situation of chaff movement, diffusion and radar echo characteristics at home anChaff Jamming plays an irreplaceable role in radar passive countermeasures. At the same time, the theory, methods and effectiveness of chaff jamming is urgent needed to be researched in-depth for the development of equipments. Based on the situation of chaff movement, diffusion and radar echo characteristics at home and abroad, the comparison of chaff jamming development situation and the threat analysis, the scientific problems and development of chaff jamming in passive radar jamming field are put forward. The research prospects of airborne chaff jamming is described, which provides a new way of innovative development for chaff jamming and thoughts for effectively promoting the advancement of our country’s chaff jamming technology, equipment development and tactical operation..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 49 (2021)
Research on Battlefield Emergency Laser Communication Technology Based on Laser Countermeasure System
MIAO Yu, HAO Bengong, ZHANG Ying, and ZHU Bin
Battlefield emergency communication system is an important method to ensure smooth command and information. According to the current situation of the extensive application of laser countermeasures such as laser jamming and warning in modern war, the pulse interval modulation and demodulation technology is adopted, suchBattlefield emergency communication system is an important method to ensure smooth command and information. According to the current situation of the extensive application of laser countermeasures such as laser jamming and warning in modern war, the pulse interval modulation and demodulation technology is adopted, such as multiplexing the laser jamming into communication laser and multiplexing the laser warning system into a receiver. The battlefield emergency communication capabilities of the system are expanded on the basis of maintaining the original function of the laser countermeasure system, the anti-jamming ability of the current emergency communication system is improved. And the effectiveness of the method is showed through simulation and experiments..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 55 (2021)
Image Copy-Paste Forensics Method Based on RG-SIFT
LI Qijie, GONG Jiachang, YANG Hongchen, and CAI Nengbin
In the reform of criminal procedure system centered on trial, the examination and acceptance of image evidence is particularly important. The most common operation of digital image tampering is copy and paste, by copying a region of the image paste to other parts, in order to increase or cover up part of the image contIn the reform of criminal procedure system centered on trial, the examination and acceptance of image evidence is particularly important. The most common operation of digital image tampering is copy and paste, by copying a region of the image paste to other parts, in order to increase or cover up part of the image content, accompanied by geometric transformation to increase the authenticity. Most of the existing algorithms for detecting similar forgeries can only deal with a certain geometric transformation, which has high computational complexity and cannot deal with the situation of multi-region copy and paste. A method of extracting scale-invariant features based on color and texture information is proposed. At first, the key points are extracted by detecting the local invariant features in the color channel of the image, and the hierarchical clustering algorithm is used for clustering. And then, the affine transformation estimation is carried out on the matching results of the key points. At last, the random sampling consensus algorithm is used to remove the unmatched key points. Experimental results show that the algorithm can better deal with the multi-region copy-paste tamper detection after a variety of transformations, and can play a role in the public security image inspection and identification work..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 66 (2021)
Research on Multi-channel Panoramic Image Mosaic Fusion Algorithm
LI Xiaolong*, LIU Liwu, LIU Chaofeng, ZHANG Long, XING Xiaoyue, and LI Zhe
According to the demand of video surveillance in outfield large scene, the shortcomings of panoramic image of single panoramic camera, the difficulty of multi-channel panoramic image splicing fusion of multiple panoramic cameras and the principle of splicing fusion algorithm are analyzed and studied, and a multi-channeAccording to the demand of video surveillance in outfield large scene, the shortcomings of panoramic image of single panoramic camera, the difficulty of multi-channel panoramic image splicing fusion of multiple panoramic cameras and the principle of splicing fusion algorithm are analyzed and studied, and a multi-channel panoramic image splicing fusion algorithm is designed. Research results show that the design of the algorithm is reasonable, which can effectively splice and fuse multi-channel panoramic images, has good visual perception and image quality, and can provide reference for improving the ability of outfield panoramic monitoring..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 71 (2021)
Research on MRTD Testing Method of Infrared Imaging System
LV Xinmeng, and ZHOU Jun
Testing problems for minimum resolvable temperature difference (MRTD) is discussed, which is an important parameter of infrared imaging systems. At first, traditional testing methods and principles for MRTD are introduced and the shortcomings are analyzed. And then, two objective testing methods and the intelligent tesTesting problems for minimum resolvable temperature difference (MRTD) is discussed, which is an important parameter of infrared imaging systems. At first, traditional testing methods and principles for MRTD are introduced and the shortcomings are analyzed. And then, two objective testing methods and the intelligent testing method developed on this basis are discussed. At last, two improved alternative testing methods such as MTDP and triangle orientation discrimination (TOD) are introduced, and the advantages and disadvantages are analyzed respectively..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 77 (2021)
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