红外技术2025，Vol.47Issue(6)：681-688,8.
超二代像增强器信噪比提高方法研究
Methods for SNR Improvement of Super Ⅱ Image Intensifier
曾进能 1朱世聪 1崔万兵 1伏兵 1王婷 1褚祝军 1王乙瑾 1李晓君 2杨琼连 1吴佩遥 1邱祥彪 1李廷涛 1宋奇庚 1孙正社1
作者信息
- 1. 北方夜视技术股份有限公司,云南 昆明 650217
- 2. 空军装备部驻昆明地区军事代表室,云南 昆明 650217
- 折叠
摘要
Abstract
In this study,the main factors affecting the signal-to-noise ratio(SNR)of a super-second-generation image intensifier are investigated through theoretical analysis combined with experimental validation.The results show that photocathode sensitivity,brightness gain,the opening area ratio of the Microchannel Plate(MCP),the secondary electron emission coefficient at the first electron collision,and the MCP tilt angle all influence the SNR.The SNR increases with higher photocathode sensitivity—rising by 49.6％when the sensitivity increases from 356 μA/lm to 1013 μA/lm.Conversely,the SNR decreases with the increase of luminance gain—dropping by 12.3％ as luminance gain increases from 5000 cd·m-2·lx-1 to 20000 cd·m-2·lx-1.The SNR is negatively correlated with the MCP noise factor.A lower noise factor is associated with a larger MCP opening area ratio and a higher secondary electron emission coefficient during the first electron collision.Additionally,the MCP noise factor first decreases and then increases with increasing MCP tilt angle.Based on these findings,the optimal values for the MCP opening area ratio,the secondary electron emission coefficient at first collision,and the tilt angle were determined within a defined range of sensitivity and brightness gain.Under these optimized conditions,the MCP noise factor is reduced by 38.0％,and the SNR is improved by 26.9％ compared to the standard configuration of the super-second-generation image intensifier.This work lays a strong foundation for further enhancing the SNR performance of super-second-generation image intensifiers.关键词
像增强器/微通道板/噪声因子/信噪比Key words
image intensifier/MCP/Noise factor/SNR分类
物理学引用本文复制引用
曾进能,朱世聪,崔万兵,伏兵,王婷,褚祝军,王乙瑾,李晓君,杨琼连,吴佩遥,邱祥彪,李廷涛,宋奇庚,孙正社..超二代像增强器信噪比提高方法研究[J].红外技术,2025,47(6):681-688,8.
