Prof. Benkang Chang Profile

Prof. Benkang Chang

Professor at Nanjing Univ of Science & Technology

SPIE Involvement:

Author | Editor

Publications (113)

Proceedings Article | 30 November 2023 Poster + Paper

Integrated ultrahigh vacuum facility for photocathode preparation and in-situ characterization

Yijun Zhang, Yunsheng Qian, Junju Zhang, Rongguo Fu, Lei Liu, Yafeng Qiu, Benkang Chang

Proceedings Volume 12796, 127960D (2023) https://doi.org/10.1117/12.2691136

KEYWORDS: Indium gallium arsenide, X-ray photoelectron spectroscopy, Semiconductors, Contamination

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Proceedings Article | 20 February 2018 Paper

Improved detection probability of low level light and infrared image fusion system

Yuxiang Luo, Rongguo Fu, Junju Zhang, Wencong Wang, Benkang Chang

Proceedings Volume 10697, 106972N (2018) https://doi.org/10.1117/12.2317475

KEYWORDS: Digital signal processing, Image fusion, Infrared imaging, Infrared radiation, Infrared detectors, Sensors, Target detection, Video, Image enhancement, Image registration

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Proceedings Article | 5 November 2015 Paper

Resolution characteristics of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathodes

Wenjuan Deng, Daoli Zhang, Jijun Zou, Xincun Peng, Weilu Wang, Yijun Zhang, Benkang Chang

Proceedings Volume 9795, 97951X (2015) https://doi.org/10.1117/12.2216219

KEYWORDS: Modulation transfer functions, Gallium arsenide, Doping, Aluminum, Quantum efficiency, Spatial frequencies, Interfaces, Diffusion, Analytical research, Electron transport

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Proceedings Article | 15 October 2015 Paper

Study of photoemission mechanism for varied doping GaN photocathode

Jianliang Qiao, Yuan Xu, Jun Niu, Youtang Gao, Benkang Chang

Proceedings Volume 9674, 96741X (2015) https://doi.org/10.1117/12.2199773

KEYWORDS: Gallium nitride, Doping, Quantum efficiency, Cesium, Ultraviolet radiation, Diffusion, Chemical species, Absorption, Tellurium, Control systems

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Proceedings Article | 29 July 2015 Paper

design of optical component structure for AlxGa1-xN photocathodes

Mingzhu Yang, Benkang Chang, Guanghui Hao

Proceedings Volume 9659, 965918 (2015) https://doi.org/10.1117/12.2192196

KEYWORDS: Quantum efficiency, Aluminum, Aluminum nitride, Reflectivity, Thin films, Optical properties, Transmittance, Photons, Sensors, Absorption

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Proceedings Article | 24 October 2014 Paper

Photoemission behaviors of transmission-mode InGaAs photocathode

Muchun Jin, Benkang Chang, Xinlong Chen, Yijun Zhang, Hongchang Cheng

Proceedings Volume 9270, 92701C (2014) https://doi.org/10.1117/12.2065301

KEYWORDS: Electrons, Indium gallium arsenide, Gallium arsenide, Quantum efficiency, Doping, Cesium, Interfaces, Night vision, Oxygen, Scattering

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Proceedings Article | 2 September 2014 Paper

Study on photoemission surface of varied doping GaN photocathode

Jianliang Qiao, Ruijuan Du, Huan Ding, Youtang Gao, Benkang Chang

Proceedings Volume 9284, 92840H (2014) https://doi.org/10.1117/12.2070537

KEYWORDS: Cesium, Gallium nitride, Doping, Chemical species, Electrons, Quantum efficiency, Oxygen, Magnesium, Signal processing, Ultraviolet radiation

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Proceedings Article | 2 September 2014 Paper

Change of the surface potential barrier of GaAs photocathode during two-step activation

Jun Niu, Youtang Gao, Yunsheng Qian, Benkang Chang

Proceedings Volume 9284, 92840T (2014) https://doi.org/10.1117/12.2071195

KEYWORDS: Cesium, Gallium arsenide, Chemical species, Oxygen, Arsenic, Gallium, Beryllium, X-rays, Photoemission spectroscopy, Ions

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Proceedings Article | 21 February 2014 Paper

Algorithm selective method of infrared/visual image fusion system based on air humidity

Bin Sun, Junju Zhang, Benkang Chang, Chaobo Min, Yingjie Li

Proceedings Volume 9142, 91420V (2014) https://doi.org/10.1117/12.2054556

KEYWORDS: Target detection, Detection and tracking algorithms, Image fusion, Infrared radiation, Humidity, Infrared imaging, Environmental sensing, Visible radiation, Visualization, Infrared detectors

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SPIE Journal Paper | 16 December 2013

New method for unsupervised segmentation of moving objects in infrared videos

Chaobo Min, Junju Zhang, Benkang Chang, Baohui Zhang, Yingjie Li

JEI, Vol. 22, Issue 04, 043026, (December 2013) https://doi.org/10.1117/12.10.1117/1.JEI.22.4.043026

KEYWORDS: Image segmentation, Video, Infrared radiation, Infrared imaging, Quantization, Image processing, Image processing algorithms and systems, Binary data, Video processing, Video surveillance

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Proceedings Article | 16 August 2013 Paper

Comparison of resolution characteristics between exponential-doping and uniform-doping GaN photocathodes

Hong-gang Wang, Yun-sheng Qian, Liu-bing Lu, Hong-chang Cheng, Ben-kang Chang

Proceedings Volume 8912, 89121D (2013) https://doi.org/10.1117/12.2034701

KEYWORDS: Modulation transfer functions, Gallium nitride, Diffusion, Quantum efficiency, Image resolution, Image intensifiers, Fourier transforms, Spatial frequencies, Tellurium, Spatial resolution

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The studies of quantum efficiency, electronic energy distribution and stability are highly concerned in the application of Negative electron affinity (NEA) gallium nitride (GaN) photocathodes while the resolution of photocathodes are concerned rarely. The resolutions of some image intensifiers are smaller than computational value partly because of ignoring the resolution of photocathodes. To a certain extent, the resolutions of image intensifiers are influenced by photocathodes. Electronic transverse diffusion is the main cause of decreasing the resolution of photocathodes whereas the exponential-doping structure can reduce its influence. In this paper, the resolution characteristics of photocathodes have been studied by using the modulation transfer function (MTF) method. The MTF expressions of transmission-mode exponential-doping photocathodes have been obtained by solving the two-dimensional continuity equations. According to the MTF expressions, the resolution characteristics between exponential-doping and uniform-doping GaN photocathodes are calculated theoretically and analyzed comparatively. At the same time, the relationships between resolution and thickness of the emission layer T_e, electron diffusion length L_D are researched in detail. The calculated results show that, compared with the uniform-doping photocathode, the exponential-doping structure can increase the resolution of photocathode evidently. The resolution of exponential-doping GaN photocathode is improved distinctly when the spatial frequency varies from 400 to 800 lp/mm. The MTF characteristics approach gradually when f increases or decreases. Let f =600 lp/mm, the resolution increases by 20%-48% approximately. The constant built-in electric field for exponential-doping GaN photocathode can increase the resolution of photocathode. The improvement of resolution is different from decreasing T_e, L_D or increasing the recombination velocity of back-interface which are at the cost of reducing the quantum efficiency of photocathode. Therefore, the MTF expressions of transmission-mode exponential-doping photocathode play a positive role in improving the resolution of ultraviolet detector and optimizing the structural design of GaN photocathode.

Proceedings Article | 16 August 2013 Paper

Wet etching of AlGaN/GaN photocathode grown by MOCVD

Guanghui Hao, Benkang Chang, Hongchang Cheng

Proceedings Volume 8912, 891214 (2013) https://doi.org/10.1117/12.2034325

KEYWORDS: Gallium nitride, Transmittance, Reflectivity, Sapphire, Etching, Metalorganic chemical vapor deposition, Quantum efficiency, Thin films, Nickel, Refractive index

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Proceedings Article | 19 March 2013 Paper

Research on area source electron gun in vacuum system

Yafeng Qiu, Benkang Chang, Feng Shi, Yunsheng Qian, Rongguo Fu

Proceedings Volume 8762, 87621R (2013) https://doi.org/10.1117/12.2019681

KEYWORDS: Luminescence, Image intensifiers, Shape analysis, Luminous efficiency, Microchannel plates, Analytical research, Temperature metrology, Tantalum, Scattering, 3D displays

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Proceedings Article | 4 March 2013 Paper

Halo performance on low light level image intensifiers

Dongxu Cui, Ling Ren, Benkang Chang, Feng Shi, Jifang Shi, Yunsheng Qian, Honggang Wang, Junju Zhang

Proceedings Volume 8761, 876108 (2013) https://doi.org/10.1117/12.2019621

KEYWORDS: Image intensifiers, Charge-coupled devices, Microchannel plates, Integrating spheres, Light sources, Scattering, Image resolution, Image processing, Optical filters, Sensors

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Proceedings Article | 27 November 2012 Paper

Variable doping narrow-band response GaAlAs photocathode the preparation method of the research

Yuan Xu, XinLong Chen, Jing Zhao, Honggang Wang, BenKang Chang

Proceedings Volume 8555, 85551I (2012) https://doi.org/10.1117/12.2001207

KEYWORDS: Doping, Quantum efficiency, Gallium arsenide, Aluminum, Cesium, Structural design, Control systems, Ocean optics, Interfaces, Absorption

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Proceedings Article | 27 November 2012 Paper

Blue-green reflection-mode GaAlAs photocathodes

Xinlong Chen, Jing Zhao, Benkang Chang, Muchun Jin, Guanghui Hao, Yuan Xu

Proceedings Volume 8555, 85550R (2012) https://doi.org/10.1117/12.999271

KEYWORDS: Gallium arsenide, Cesium, Aluminum, Wet etching, Quantum efficiency, Etching, Metalorganic chemical vapor deposition, Oxides, Oxygen, Doping

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Proceedings Article | 27 November 2012 Paper

Photoemission stability of negative electron affinity GaN photocathode

Junju Zhang, Xiaohui Wang, Wenzheng Yang, Weidong Tang, Xiaoqian Fu, Biao Li, Benkang Chang

Proceedings Volume 8555, 85551C (2012) https://doi.org/10.1117/12.2001125

KEYWORDS: Gallium nitride, Cesium, Quantum efficiency, Oxygen, Gases, Ultraviolet radiation, Protactinium, Magnesium, Doping, Ions

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Proceedings Article | 26 November 2012 Paper

Analysis of thermal shock strength and quality factor with infrared optical domes

Youtang Gao, Shuo Liu, Yuan Xu, Benkang Chang

Proceedings Volume 8557, 85572I (2012) https://doi.org/10.1117/12.999389

KEYWORDS: Thermography, Infrared radiation, Bismuth, Infrared materials, Domes, Missiles, Thermal modeling, Silicon carbide, Infrared imaging, Diamond

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Proceedings Article | 16 October 2012 Paper

Noise factor of microchannel plate with ion barrier film

Shu-lin Liu, Feng Shi, Zhou-kui Li, Yu-feng Zhu, Ni Zhang, Yan Gu, Jian-ning Sun, Xiao-qing Cong, Hui-min Zhao, Jing-sheng Pan, Yun-sheng Qian, Shao-cheng Zheng, Ben-kang Chang

Proceedings Volume 8416, 84162G (2012) https://doi.org/10.1117/12.977793

KEYWORDS: Microchannel plates, Signal to noise ratio, Image intensifiers, Interference (communication), Ions, Ion beam finishing, Manufacturing, Signal processing, Image processing, Control systems

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Proceedings Article | 15 October 2012 Paper

Characteristics of GaN material and application in UV detection

Jianliang Qiao, Yuan Xu, Xiaohui Wang, Yunsheng Qian, Benkang Chang

Proceedings Volume 8419, 84192E (2012) https://doi.org/10.1117/12.977904

KEYWORDS: Gallium nitride, Ultraviolet radiation, Ultraviolet detectors, Quantum efficiency, Cesium, Sensors, Semiconductors, Image intensifiers, Free space, Imaging systems

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Proceedings Article | 15 October 2012 Paper

Surface cleaning for negative electron affinity GaN photocathode

Jianliang Qiao, Yingpeng Yin, Youtang Gao, Jun Niu, Yunsheng Qian, Benkang Chang

Proceedings Volume 8419, 841920 (2012) https://doi.org/10.1117/12.977891

KEYWORDS: Gallium nitride, Carbon, Chemical species, Oxides, Oxygen, Gallium, Quantum efficiency, Photoemission spectroscopy, Protactinium, X-rays

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Proceedings Article | 27 September 2011 Paper

The design of MTF test system based on point light source

Rongguo Fu, Ning Wu, Xinlong Zhang, Yafeng Qiu, Benkang Chang

Proceedings Volume 8126, 81260Q (2011) https://doi.org/10.1117/12.890024

KEYWORDS: Modulation transfer functions, Fourier transforms, Charge-coupled devices, Image processing, Light sources, Imaging systems, Image acquisition, Light, Microscopes, Optical testing

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Proceedings Article | 22 September 2011 Paper

Research on testing instrument and method for correction of the uniformity of image intensifier fluorescence screen brightness

YaFeng Qiu, BenKang Chang, YunSheng Qian, RongGuo Fu

Proceedings Volume 8134, 81340L (2011) https://doi.org/10.1117/12.891128

KEYWORDS: Luminescence, Electrons, Image intensifiers, Infrared imaging, Testing and analysis, Imaging systems, Light, Control systems, Computing systems, Sensors

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Proceedings Article | 8 September 2011 Paper

Noise research of microbolometer array under temperature environment

You-tang Gao, Hua-min Chen, Yuan Xu, Xia-nan Sun, Ben-kang Chang

Proceedings Volume 8193, 81930S (2011) https://doi.org/10.1117/12.899421

KEYWORDS: Thermography, Mathematical modeling, Sensors, Infrared radiation, Environmental sensing, Resistors, Thermal modeling, Infrared detectors, Image quality standards, Microbolometers

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Proceedings Article | 4 March 2011 Paper

The research of the laser facula of laser ranger finder in the far distance

Rongguo Fu, Chula Su, Mengxi Li, Yiliang Guo, Yu Cheng, Benkang Chang

Proceedings Volume 7912, 79121Z (2011) https://doi.org/10.1117/12.873565

KEYWORDS: Infrared radiation, Charge-coupled devices, Pulsed laser operation, Infrared imaging, Optical filters, CCD cameras, Infrared cameras, Digital filtering, Laser range finders, Image processing

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SPIE Journal Paper | 1 March 2011

Objective quality evaluation of visible and infrared color fusion image

Yihui Yuan, Junju Zhang, Benkang Chang, Yiyong Han

OE, Vol. 50, Issue 03, 033202, (March 2011) https://doi.org/10.1117/12.10.1117/1.3549928

KEYWORDS: Image fusion, Image quality, Visible radiation, Infrared imaging, Infrared radiation, Image analysis, Optical engineering, Color difference, Visualization, Image processing

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Proceedings Article | 23 November 2010 Paper

Influence of varied doping structure on the photo-emission of reflection-mode photocathode

Jun Niu, Ge Zhang, Yijun Zhang, Benkang Chang

Proceedings Volume 7847, 78471M (2010) https://doi.org/10.1117/12.868384

KEYWORDS: Doping, Quantum efficiency, Gallium arsenide, Electron transport, Diffusion, Protactinium, Image processing, Dielectrics, Statistical analysis, Germanium

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Proceedings Article | 18 November 2010 Paper

Exponential-doping GaAs NEA photocathode grown by MBE

Junju Zhang, Yijun Zhang, Yujie Du, Biao Li, Xiaoqian Fu, Benkang Chang

Proceedings Volume 7847, 78472Y (2010) https://doi.org/10.1117/12.870665

KEYWORDS: Gallium arsenide, Doping, Electrons, Beryllium, Diffusion, Interfaces, Quantum efficiency, Metalorganic chemical vapor deposition, Sodium, Absorption

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Proceedings Article | 18 November 2010 Paper

Thermal research of infrared sight thermoelectric cooler control circuit under temperature environment

Youtang Gao, Huan Ding, Xiao Xue, Yuan Xu, Benkang Chang

Proceedings Volume 7847, 78472C (2010) https://doi.org/10.1117/12.869890

KEYWORDS: Thermography, Thermoelectric materials, Packaging, Infrared radiation, Thermal modeling, Finite element methods, Reliability, Control systems, Computer simulations, Analytical research

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Proceedings Article | 23 October 2010 Paper

Preparation of negative electron affinity gallium nitride photocathode

Jianliang Qiao, Benkang Chang, Yunsheng Qian, Xiaoqing Du, Yijun Zhang, Xiaohui Wang

Proceedings Volume 7658, 76581H (2010) https://doi.org/10.1117/12.864677

KEYWORDS: Gallium nitride, Ultraviolet radiation, Quantum efficiency, Cesium, Vapor phase epitaxy, Metals, Chemical species, Spectroscopy, Organic chemistry, Molecules

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Proceedings Article | 22 October 2010 Paper

Contrast study on GaAs photocathode activation techniques

Jun Niu, Yijun Zhang, Benkang Chang, Zhi Yang, Yajuan Xiong

Proceedings Volume 7658, 765840 (2010) https://doi.org/10.1117/12.864161

KEYWORDS: Cesium, Oxygen, Gallium arsenide, Chemical species, Adsorption, Process modeling, Optoelectronics, Astatine, Zinc, Gallium

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Proceedings Article | 22 October 2010 Paper

Spectral response variation of exponential-doping transmission-mode GaAs photocathodes in the preparation process

Yijun Zhang, Jun Niu, Benkang Chang, Yajuan Xiong, Zhi Yang, Yujie Du

Proceedings Volume 7658, 765841 (2010) https://doi.org/10.1117/12.864180

KEYWORDS: Gallium arsenide, Indium, Quantum efficiency, Doping, Diffusion, Interfaces, Cesium, Beryllium, Electronics engineering, Optoelectronics

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Proceedings Article | 20 October 2010 Paper

The manufacturing and testing of Cs2Te UV image intensifier

Rongguo Fu, Benkang Chang, Yuansheng Qian, Yafeng Qiu

Proceedings Volume 7835, 78350R (2010) https://doi.org/10.1117/12.865514

KEYWORDS: Ultraviolet radiation, Image intensifiers, Quantum efficiency, Microchannel plates, Manufacturing, Cesium, Interfaces, Electrodes, Chemical species, Tellurium

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Proceedings Article | 8 December 2009 Paper

Laser scanning system for large diameter measurement

Liang Chen, Shuqin Zhang, Shangzhong Ji, Benkang Chang, Jun Yu

Proceedings Volume 7506, 750625 (2009) https://doi.org/10.1117/12.838280

KEYWORDS: Signal detection, Laser scanners, Laser systems engineering, Sensors, Error analysis, Detection theory, Confocal microscopy, Mirrors, Environmental sensing, Optoelectronics

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Proceedings Article | 24 September 2009 Paper

Activation and evaluation of GaN photocathodes

Yunsheng Qian, Benkang Chang, Jianliang Qiao, Yijun Zhang, Rongguo Fu, Yafeng Qiu

Proceedings Volume 7481, 74810H (2009) https://doi.org/10.1117/12.830153

KEYWORDS: Gallium nitride, Ultraviolet radiation, Control systems, Quantum efficiency, Cesium, Lamps, Photoemission spectroscopy, Gallium arsenide, Xenon, Monochromators

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Proceedings Article | 24 September 2009 Paper

Spectral matching factors between low-light-level and infrared fusion optoelectronic detector and objects

Lei Liu, Yinghao Fan, Benkang Chang

Proceedings Volume 7481, 74810X (2009) https://doi.org/10.1117/12.828940

KEYWORDS: Infrared detectors, Sensors, Infrared radiation, Infrared sensors, Vegetation, Reflectivity, Optoelectronics, Night vision systems, Mercury cadmium telluride, Night vision

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Proceedings Article | 3 February 2009 Paper

Transformation and analysis of pixels based on low-level-light image

Youtang Gao, Yuan Xu, Si Tian, Benkang Chang

Proceedings Volume 7160, 71602Z (2009) https://doi.org/10.1117/12.810985

KEYWORDS: Image processing, CCD image sensors, Telescopes, Charge-coupled devices, Image analysis, Computing systems, Image sensors, Lamps, Electronics engineering, Data processing

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Proceedings Article | 5 March 2008 Paper

The real-time processing system of infrared and LLL image fusion

Yunsheng Qian, Junju Zhang, Shi Tian, Qian Chao, Zixiang Zhou, Benkang Chang

Proceedings Volume 6623, 66231Y (2008) https://doi.org/10.1117/12.791535

KEYWORDS: Image fusion, Image processing, Infrared imaging, Video, Imaging systems, Infrared radiation, Video processing, Computing systems, Image acquisition, Computer simulations

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Proceedings Article | 3 March 2008 Paper

The relationship of image quality of image intensifier and the luminance of its background

YaFeng Qiu, BenKang Chang, LianJun Sun, Youtang Gao, Si Tiang, YunSheng Qian

Proceedings Volume 6621, 66210R (2008) https://doi.org/10.1117/12.790671

KEYWORDS: Image intensifiers, Image quality, Image resolution, Signal to noise ratio, Interference (communication), Luminescence, Video, Imaging systems, Optical resolution, Imaging devices

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Proceedings Article | 3 March 2008 Paper

Area source electron gun uniformity analysis

YaFeng Qiu, BenKang Chang, LianJun Sun, JunJu Zhang, YouTang Gao, RongGuo Fu

Proceedings Volume 6621, 66210H (2008) https://doi.org/10.1117/12.790658

KEYWORDS: Radon, Luminescence, Image intensifiers, Image quality, Ultraviolet radiation, Testing and analysis, Analytical research, Tantalum, Logic, Iterative methods

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Proceedings Article | 3 March 2008 Paper

Performance measurement of phosphor screens used in optoelectronic image devices

YunSheng Qian, YaFeng Qiu, Hui Li, BenKang Chang

Proceedings Volume 6621, 66210G (2008) https://doi.org/10.1117/12.790601

KEYWORDS: Imaging systems, Electron beams, Optoelectronic devices, Luminous efficiency, Telecommunications, Optoelectronics, Computing systems, Control systems, Image quality, Signal processing

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Proceedings Article | 3 March 2008 Paper

Performance analysis and improvement of microbolometer imaging system

LianJun Sun, JunJu Zhang, BenKang Chang, YaFeng Qiu, YunSheng Qian, Si Tian

Proceedings Volume 6621, 66211N (2008) https://doi.org/10.1117/12.790862

KEYWORDS: Imaging systems, Staring arrays, Microbolometers, Calibration, Temperature metrology, Thermography, Nonuniformity corrections, Infrared radiation, Image quality, Resistance

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Proceedings Article | 3 March 2008 Paper

Ambient light effect on the uniformity of image intensifier fluorescence screen brightness

YaFeng Qiu, BenKang Chang, LianJun Sun, JunJu Zhang, YouTang Gao, RongGuo Fu

Proceedings Volume 6621, 66210S (2008) https://doi.org/10.1117/12.790673

KEYWORDS: Luminescence, Charge-coupled devices, Image intensifiers, MATLAB, Microscopes, Image analysis, Signal to noise ratio, Sun, Mechanics, Electronics engineering

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Proceedings Article | 3 March 2008 Paper

Infrared target tracking in real-time video and its implementation

JunJu Zhang, Si Tian, BenKang Chang, YunSheng Qian, LianJun Sun, YaFeng Qiu

Proceedings Volume 6621, 66211S (2008) https://doi.org/10.1117/12.790937

KEYWORDS: Infrared radiation, Infrared search and track, Digital signal processing, Video, Infrared imaging, Radon, Internet, Target detection, Motion estimation, Detection and tracking algorithms

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Proceedings Article | 3 March 2008 Paper

Study of uncooled thermal imaging system with multiple working temperatures

Junju Zhang, Lianjun Sun, Yunsheng Qian, Benkang Chang, Si Tian, Yafeng Qiu

Proceedings Volume 6621, 66211R (2008) https://doi.org/10.1117/12.790935

KEYWORDS: Imaging systems, Thermography, Temperature metrology, Sensors, Microbolometers, Switches, Environmental sensing, Thermoelectric materials, Resistance, Staring arrays

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Proceedings Article | 3 March 2008 Paper

Comparative study of GaN and GaAs photocathodes

Jianliang Qiao, Benkang Chang, Zhi Yang, Si Tian, Youtang Gao

Proceedings Volume 6621, 66210K (2008) https://doi.org/10.1117/12.790664

KEYWORDS: Gallium nitride, Gallium arsenide, Quantum efficiency, Cesium, Doping, Spectroscopy, Oxygen, Imaging systems, Diffusion, Ultraviolet radiation

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Proceedings Article | 19 February 2008 Paper

Multi-frame infrared image restoration

Si Tian, Jianliang Qiao, Youtang Gao, Yafeng Qiu, Benkang Chang

Proceedings Volume 6625, 66250Q (2008) https://doi.org/10.1117/12.790847

KEYWORDS: Infrared imaging, Infrared radiation, Image restoration, Image processing, Infrared detectors, Thermal modeling, Mathematical modeling, Motion models, Digital image processing, Signal to noise ratio

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Proceedings Article | 23 January 2008 Paper

A kind of real-time infrared image enhancement algorithm

Tian Si, Youtang Gao, Jianliang Qiao, Benkang Chang

Proceedings Volume 6835, 683518 (2008) https://doi.org/10.1117/12.753977

KEYWORDS: Infrared imaging, Infrared radiation, Image enhancement, Field programmable gate arrays, Image quality, Signal to noise ratio, Image processing, Eye, Visualization, Image analysis

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Proceedings Article | 8 January 2008 Paper

Iterative infrared image restoration

Tian Si, Jianliang Qiao, Youtang Gao, Benkang Chang

Proceedings Volume 6835, 683517 (2008) https://doi.org/10.1117/12.753974

KEYWORDS: Infrared radiation, Infrared imaging, Image restoration, Thermography, Image quality, Thermal modeling, Motion models, Image processing, Infrared detectors, Mathematical modeling

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Proceedings Article | 12 December 2007 Paper

On-line measurement system of GaAs photocathodes and its applications

Jijun Zou, Lin Feng, Gangyong Lin, Yuntao Rao, Zhi Yang, Yunsheng Qian, Benkang Chang

Proceedings Volume 6782, 67823D (2007) https://doi.org/10.1117/12.745945

KEYWORDS: Gallium arsenide, Cesium, Gallium, Oxygen, Quantum efficiency, Temperature metrology, Statistical analysis, Oxides, Telecommunications, Arsenic

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Proceedings Article | 19 November 2007 Paper

Analysis and measurement of thermal-electrical performance of microbolometer detector

Lianjun Sun, Benkang Chang, Junju Zhang, Yafeng Qiu, Yunsheng Qian, Si Tian

Proceedings Volume 6782, 678231 (2007) https://doi.org/10.1117/12.745347

KEYWORDS: Microbolometers, Sensors, Staring arrays, Imaging systems, Calibration, Thermography, Infrared sensors, Infrared radiation, Sensor performance, Infrared detectors

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Proceedings Article | 19 November 2007 Paper

Activation experiments and quantum efficiency theory on gradient-doping NEA GaAs photocathodes

Jijun Zou, Zhi Yang, Jianliang Qiao, Pin Gao, Benkang Chang

Proceedings Volume 6782, 67822R (2007) https://doi.org/10.1117/12.745944

KEYWORDS: Quantum efficiency, Doping, Gallium arsenide, Cesium, Diffusion, Interfaces, Tellurium, Photons, Electronics engineering, Optoelectronics

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Proceedings Article | 1 November 2007 Paper

Thermal and electrical performance of a-Si microbolometer focal plane arrays

Lianjun Sun, Benkang Chang, Junju Zhang, Yunsheng Qian, Yafeng Qiu

Proceedings Volume 6423, 64232D (2007) https://doi.org/10.1117/12.779855

KEYWORDS: Staring arrays, Microbolometers, Lead, Microelectromechanical systems, Amorphous silicon, Resistance, Numerical simulations, Germanium, Temperature metrology, Switching

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Proceedings Article | 1 November 2007 Paper

Transient thermal simulation of uncooled microbolometer detectors and their performance analysis

Junju Zhang, Lianjun Sun, Benkang Chang, Yunsheng Qian, Yafeng Qiu, Si Tian

Proceedings Volume 6423, 64234S (2007) https://doi.org/10.1117/12.780316

KEYWORDS: Sensors, Microbolometers, Infrared detectors, Sensor performance, Finite element methods, Staring arrays, Readout integrated circuits, Thermal modeling, Resistance, Silicon

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Proceedings Article | 29 January 2007 Paper

Motion detection and estimation in low-level-light video sequence

Si Tian, Benkang Chang, Youtang Gao, Yafeng Qiu, Jianliang Qiao, Rongguo Fu

Proceedings Volume 6279, 627951 (2007) https://doi.org/10.1117/12.725576

KEYWORDS: Motion detection, Motion estimation, Video, Image filtering, Motion models, Signal to noise ratio, Video surveillance, 3D modeling, Fourier transforms, Gaussian filters

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Proceedings Article | 11 January 2007 Paper

Model for the brightness uniformity of fluorescence screen of image intensifier

YaFeng Qiu, BenKang Chang, YunSheng Qian, RongGuo Fu, Youtang Gao, Tian Si

Proceedings Volume 6279, 62792F (2007) https://doi.org/10.1117/12.725237

KEYWORDS: Luminescence, Image intensifiers, Mathematical modeling, Electrons, Infrared imaging, Mathematics, Microchannel plates, Analytical research, Databases, Ultraviolet radiation

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Proceedings Article | 11 January 2007 Paper

Averaging algorithm of reticle images in low-level-light weapon sight based on impact condition

Youtang Gao, Benkang Chang, Si Tian, Yafeng Qiu, Jianliang Qiao, Rongguo Fu

Proceedings Volume 6279, 62792U (2007) https://doi.org/10.1117/12.725455

KEYWORDS: Digital filtering, Weapons, Image processing, Reticles, Image filtering, Convolution, CCD image sensors, Electronics engineering, Charge-coupled devices, Evolutionary algorithms

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Proceedings Article | 11 January 2007 Paper

Fluorescent image processing of image intensifier based on edge detector operator

Youtang Gao, Benkang Chang, Yafeng Qiu, Si Tian, Jianliang Qiao, Rongguo Fu

Proceedings Volume 6279, 62790Q (2007) https://doi.org/10.1117/12.725105

KEYWORDS: Sensors, Image intensifiers, Image processing, Edge detection, Image sensors, CCD image sensors, Convolution, Detection and tracking algorithms, Error analysis, Charge-coupled devices

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Proceedings Article | 27 October 2006 Paper

Uncooled thermal imaging and image analysis

Shiyun Wang, Benkang Chang, Chunyu Yu, Junju Zhang, Lianjun Sun

Proceedings Volume 6047, 60470L (2006) https://doi.org/10.1117/12.710657

KEYWORDS: Thermography, Sensors, Image analysis, Imaging systems, Spatial resolution, Staring arrays, Image resolution, Image quality, Signal processing, Image processing

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Proceedings Article | 27 October 2006 Paper

A novel x-ray imaging system and its imaging performance

Chunyu Yu, Benkang Chang, Shiyun Wang, Junju Zhang, Xiao Yao

Proceedings Volume 6047, 60470W (2006) https://doi.org/10.1117/12.710678

KEYWORDS: X-ray imaging, Imaging systems, Image processing, Image intensifiers, X-rays, Interference (communication), Signal to noise ratio, Charge-coupled devices, Signal processing, X-ray technology

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