Dr. Lei Yan Profile

Dr. Lei Yan

at Science and Technology on Low-Light-Level Night Vision Lab

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Author

Publications (16)

Proceedings Article | 13 December 2024 Paper

Research on electron dispersion mechanism and resolution characteristics of EBAPS

Haibo Fan, Lei Yan, Hongchang Cheng, Gangcheng Jiao, Chao Xiao, Jian Han, Jiabin Qiao, Tongtong Li

Proceedings Volume 13496, 1349607 (2024) https://doi.org/10.1117/12.3045615

KEYWORDS: Modulation transfer functions, Diffusion, Electron transport, Scattering, Thin films, Image resolution, Gallium arsenide, Electron beams, CMOS devices

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Proceedings Article | 13 December 2024 Paper

Development and consideration on low-light-level real-time color imaging technology

Dan Ding, Feng Shi, Hongchang Cheng, Xin Guo, Lei Yan, Hongjin Qiu

Proceedings Volume 13496, 1349608 (2024) https://doi.org/10.1117/12.3045621

KEYWORDS: Image enhancement, Color imaging, Optical filters, Light sources and illumination, High dynamic range imaging, Image processing, Image intensifiers

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Proceedings Article | 30 April 2024 Paper

Surface passivation film optimization and electronic sensitivity characteristic test of back-illuminated CMOS

Jing Ma, Chao Xiao, Shiwei Lei, Tongtong Li, Chenglin Li, Lei Yan, Gangcheng Jiao

Proceedings Volume 13155, 131550N (2024) https://doi.org/10.1117/12.3016871

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Proceedings Article | 4 April 2023 Paper

Research on noise characteristics of EBAPS digital low light level device

Tongtong Li, Chao Xiao, Gangcheng Jiao, Lei Yan, Jing Ma, Chenglin Li, Ye Yang, Haibo Fan, Zhou Zheng, Shiwei Lei, Jian Han

Proceedings Volume 12617, 126176F (2023) https://doi.org/10.1117/12.2666708

KEYWORDS: Photons, Signal to noise ratio, Interference (communication), Vacuum, Diffusion, Signal processing, Imaging systems, Image processing, Doping, Sensors

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Electron Bombardment Active Pixel Sensor (EBAPS) can work in photosensitive mode and electrical sensitive mode due to the special doping mode of CMOS. In both operating modes, after the target signal passes through the photoelectric conversion, gain and readout process of the EBAPS device, the readout signal needs to exceed the noise generated by the device to ensure the distinguishable output image. However, in the process of conversion and multiplication of the target signal, noise will inevitably be introduced. The noise will be amplified along with the signal, causing distortion or attenuation of the original signal, thus interfering with the quality of the output image and affecting human observation. Therefore, it is necessary to study the noise characteristics of EBAPS as a key factor affecting the imaging quality. For the development of high-performance EBAPS devices, this paper focuses on the noise characteristics of detection and imaging under different operating modes. By analyzing the working principle of EBAPS devices in different working modes, the noise sources that affect the imaging quality are obtained. In photosensitive mode, the noise of EBAPS is consistent with that of ordinary CMOS image sensor. These noises are mainly affected by CMOS process level, ambient temperature, working time and other factors, and can usually be removed by image processing algorithms. In the electric sensitive mode, the noise of EBAPS mainly comes from GaAs photocathode and the electron multiplication process of CMOS. These noises can be suppressed by reducing the working temperature, improving the surface defects and cleanliness during the chip preparation, and improving the doping process of the substrate. According to the noise generation mechanism, the noise suppression methods are proposed to obtain a high SNR digital output image. The above research provides some references for the following research on noise characteristics and noise reduction methods of digital low light level devices.

Proceedings Article | 4 April 2023 Paper

Research progress of digital true color low-light-level technology

Shiwei Lei, Ye Yang, Zhou Zheng, Lei Yan, Gangcheng Jiao, Tongtong Li, Chao Xiao, Haibo Fan, Jing Ma, Jian Han, Chenglin Li

Proceedings Volume 12617, 126175E (2023) https://doi.org/10.1117/12.2666505

KEYWORDS: Optical filters, Technology, Night vision, Image filtering, Electron multiplying charge coupled devices, Design and modelling, Cameras, Image processing, Digital filtering, Color imaging

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Proceedings Article | 27 March 2022 Paper

Numerical simulation of photocathode temperature and stress strain during heat cleaning

Fen Lai, Xiang Gao, Zhipeng Hou, Jiabin Qiao, Lei Yan

Proceedings Volume 12169, 121694M (2022) https://doi.org/10.1117/12.2624146

KEYWORDS: Glasses, Gallium arsenide, Numerical simulations, Heat flux, Instrument modeling, Temperature metrology, Mathematical modeling, Tantalum, Radiative energy transfer, Gallium

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Proceedings Article | 27 March 2022 Paper

Research on an adaptive gray stretch algorithm for digital low-light-level devices

Ye Yang, Zhou Zheng, Lei Yan, Kun Han, Xiaogang Dang, Hongchang Cheng, Gangcheng Jiao, Pengbo Yang, Shiwei Lei

Proceedings Volume 12169, 121690O (2022) https://doi.org/10.1117/12.2620522

KEYWORDS: Image processing, Image enhancement, Image information entropy, Night vision, Digital image processing, Digital Light Processing, Detection and tracking algorithms, Visualization, Optoelectronics, Infrared technology

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Proceedings Article | 27 March 2022 Paper

Research on objective evaluation model for fusion image of multi-source detector

Zhou Zheng, Ye Yang, Gangcheng Jiao, Pengbo Yang, Shiwei Lei, Lei Yan, Hongchang Cheng

Proceedings Volume 12169, 1216907 (2022) https://doi.org/10.1117/12.2619522

KEYWORDS: Image fusion, Image quality, Image analysis, Visual process modeling, Sensors, Detection and tracking algorithms, Night vision, Cameras, Mathematical modeling, Image sensors

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Proceedings Article | 12 March 2021 Paper

Research progress of true color digital night vision technology

Bin Ren, Gangcheng Jiao, Ye Li, Zhou Zheng, Kai Qiao, Ye Yang, Lei Yan, Yuan Yuan

Proceedings Volume 11763, 117636C (2021) https://doi.org/10.1117/12.2587330

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Proceedings Article | 12 March 2021 Paper

Study on effect of different temperatures on imaging performance of EBAPS devices

Ye Yang, Kun Han, Lei Yan, Kai Qiao, Chao Xiao, Bin Ren, Hongchang Cheng, Gangcheng Jiao, Hang Li

Proceedings Volume 11763, 117634T (2021) https://doi.org/10.1117/12.2587110

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Proceedings Article | 12 March 2021 Paper

Research status of dark current in CMOS image sensor

Lei Yan, Feng Shi, Hongchang Cheng, Ye Yang, Bin Ren, Chao Xiao, Xiaohui Zhang

Proceedings Volume 11763, 1176340 (2021) https://doi.org/10.1117/12.2586827

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Proceedings Article | 17 April 2020 Paper

A hand-held wide dynamic camera

Yizheng Lang, Lei Yan, Ze Yao, Yunsheng Qian

Proceedings Volume 11455, 114550Y (2020) https://doi.org/10.1117/12.2559836

KEYWORDS: Cameras, Image processing, Image sensors, Field programmable gate arrays, Organic light emitting diodes, Power supplies, Computer simulations, Imaging systems, Analog electronics, Video

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Proceedings Article | 12 March 2019 Paper

Analysis of SNR in 4-transistor backside-illuminated CMOS image sensor

Sheng-kai Wang, Chuan Jin, Kai Qiao, Gang-cheng Jiao, Hong-chang Cheng, Lei Yan

Proceedings Volume 11023, 110231P (2019) https://doi.org/10.1117/12.2521805

KEYWORDS: Signal to noise ratio, Image sensors, CMOS sensors, Photodiodes, Quantum efficiency, Signal processing, Silicon

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Proceedings Article | 13 April 2015 Paper

Research on mechanical vibration impacts of GaAs photocathode photoemission performance

Feng Shi, Hong-chang Cheng, Xiao-feng Bai, Lei Yan

Proceedings Volume 9522, 95220G (2015) https://doi.org/10.1117/12.2178699

KEYWORDS: Gallium arsenide, Image intensifiers, Quantum efficiency, Diffusion, Optoelectronic devices, Absorption, Cesium, Photomultipliers, MATLAB, Night vision

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Proceedings Article | 13 April 2015 Paper

The influences of vacuum pressure and gas components on the stability of GaAs photocathode

Long Wang, Feng Shi, Hongchang Cheng, Sen Niu, Hongli Shi, Lei Yan, Xing Cheng, Yuan Yuan

Proceedings Volume 9522, 95220I (2015) https://doi.org/10.1117/12.2178709

KEYWORDS: Gallium arsenide, Signal attenuation, Cesium, Spectroscopy, Protactinium, Semiconductors, Quantum efficiency, Gases, Adsorption, Night vision

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Proceedings Article | 18 September 2014 Paper

A simple device for measuring the spectral transmittance of lens used in InGaAs image intensifier apparatus

Xiaofeng Bai, Hui Guo, Lei Yin, Yingping He, Zhipeng Hou, Zhuang Miao, Lei Yan

Proceedings Volume 9282, 92821O (2014) https://doi.org/10.1117/12.2068569

KEYWORDS: Transmittance, Monochromators, Sensors, Shortwaves, Infrared imaging, Indium gallium arsenide, Objectives, Image intensifiers, Integrating spheres, Light sources

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Showing 5 of 16 publications

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