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Proceedings Paper

Research on detectable threshold of double MCP ultraviolet image intensifier tube
Author(s): Hong-chang Cheng; Qing-duo Duanmu; Feng Shi; Hong-li Shi; Hui Liu; Liu Feng; Ying-ping He; Zhi-peng Hou; Lei Yan; Ling Ren
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Paper Abstract

In order to research the influence of the quantity of the Micro-Channel Plates (MCP) on the detectable threshold of the ultraviolet image intensifier tube, the wide spectrum image intensifier gain tester produced by Nanjing University of Science and Technology is employed to test the relation curves between self-made one single MCP ultraviolet image intensifier tube, two double MCP ultraviolet image intensifier tubes, and photocathode incidence radiation illumination respectively. With reference to the 3rd-generation low-light image intensifier failure theory, if the radiation gain of the ultraviolet image intensifier tube is defined as 1,000cd/m2, the tube will lose the effect of image intensification, when the corresponding photocathode incidence radiation illumination will be the minimum detectable threshold. Viewed from the test results, the minimum detectable threshold of the single MCP ultraviolet image intensifier tube is 3.0×10-6 W/m2, with the radiance gain linear interval between 3.0×10-6 W/m2 ~4.6×10-5 W/m2; and that of the double MCP ultraviolet image intensifier tubes is 4×10-7 W/m2, with the radiance gain linear interval between 4.0×10-7 W/m2 ~2.0×10-5 W/m2. The test results were analyzed on the basis of the MCP self-saturation effect, concluding that the saturation current density of the single-unit MCP is a fixed , but there may be certain difference among the saturation current density of different MCPs due to different materials and manufacturing processes. The test results show that the maximum of the radiation gain linear interval of the three ultraviolet image intensifier tubes are at the magnitude of 10-5 W/m2, and the non-significant differences also verified the theory. In the double MCP ultraviolet image intensifier tubes, the photocathode-produced photocurrent is multiplied in passing the first MCP and then reaches the second MCP, so the second MCP will reach the state of current saturation earlier than the first MCP, making the minimum detectable threshold of the double MCP ultraviolet image intensifier tubes is lower than that of the single ultraviolet image intensifier tube by one order of magnitude, with the linear gain interval increasing by one magnitude, and the absolute of the corresponding radiation gain of the same radiation illumination within the linear gain interval increasing by 10 times, verifying that the double MCPs can detect much lower and weaker ultraviolet radiation and realize the high gain theory. The research results has certain guiding effect towards the promotion and application of the double ultraviolet image intensifier tubes, and has great significance on enhancing the high ultraviolet radiation detection and imaging technology.

Paper Details

Date Published: 16 August 2013
PDF: 7 pages
Proc. SPIE 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications, 89120S (16 August 2013); doi: 10.1117/12.2033742
Show Author Affiliations
Hong-chang Cheng, Changchun Univ. of Science and Technology (China)
Science and Technology on Low-Light-Level Night Vision Lab. (China)
Qing-duo Duanmu, Changchun Univ. of Science and Technology (China)
Feng Shi, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Hong-li Shi, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Hui Liu, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Liu Feng, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Ying-ping He, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Zhi-peng Hou, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Lei Yan, Science and Technology on Low-Light-Level Night Vision Lab. (China)
Ling Ren, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 8912:
International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications
Benkang Chang; Hui Guo, Editor(s)

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