Analysis of first proximity voltage on the property of GEN Ⅲ image intensifier

Ni Zhang; Yu-feng Zhu; Dan Li; Jing Nie; Tai-min Zhang; Xiao-jian Liu; Zhao-lu Liu; Wei Cheng; Ling-yun Fu

doi:10.1117/12.2033706

16 August 2013 Analysis of first proximity voltage on the property of GEN Ⅲ image intensifier

Ni Zhang, Yu-feng Zhu, Dan Li, Jing Nie, Tai-min Zhang, Xiao-jian Liu, Zhao-lu Liu, Wei Cheng, Ling-yun Fu

Proceedings Volume 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications; 89120R (2013) https://doi.org/10.1117/12.2033706
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

First proximity voltage is the voltage between the cathode of Low Light Level image intensifier and the input surface of Micro-channel plate（MCP）. There are so many factors influencing the image intensifier performance, and the first proximity voltage is one of the most important factors that can not be ignored. Based on the theory analysis and test of different proximity voltage on the gain、signal-to-noise ratio and equivalent background noise, this test has studied on the important performance of Gen III image intensifier effected by the proximity voltage. By the experimental study, the increase of first proximity voltage to a certain extent can improve gain、signal-to-noise ratio and equivalent background noise at the same time. The main cause of this phenomenon is that the increase of proximity voltage can enlarge the incident electron energy, and then improve the quantum efficiency of the incident electron; meantime, stray electron produced by field emission at the action of the electric field of filmed-MCP will lead to equivalent background deterioration. Ultimately we conclude that: 1) Signal to noise is proportional to the square of he cathode sensitivity, increases with the first collision energy of the incident electron, especially at 200-500ev. 2)In the increasing process of voltage from 300v to 800v, the gain of filmed-MCP increases rapidly, but lower again when U_pk increases further because of gain self-saturation; lgG and lgU_pkare linear relationship, thus the curve can intuitively demonstrate the relationship between them. 3) Stray electron produced by field emission at the action of the electric field of filmed-MCP will lead to equivalent background deterioration, but will not exceed the requirements of technical specifications（2.5×10^-7lx）.

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Ni Zhang, Yu-feng Zhu, Dan Li, Jing Nie, Tai-min Zhang, Xiao-jian Liu, Zhao-lu Liu, Wei Cheng, and Ling-yun Fu "Analysis of first proximity voltage on the property of GEN Ⅲ image intensifier", Proc. SPIE 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications, 89120R (16 August 2013); https://doi.org/10.1117/12.2033706

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KEYWORDS

Image intensifiers

Signal to noise ratio

Microchannel plates

Signal processing

Interference (communication)

Analytical research

Quantum efficiency

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