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为了提高微光夜视仪器的鉴别能力,本文探讨了微光物镜设计中合理选择最佳工作波段及截止型滤光片的一种图解分析法,并叙述了微光物镜的工作概况,景物的辐射特性和阴极面的相对灵敏度,还提供了几种典型光电阴极对景物的光电流密度响应差分布曲线。以S_(25)光电阴极在月光下观察景物(树叶、暗绿漆)的光电流密度响应差分布曲线为例,运用积分概念并根据曲线直观地分析了加入截止型滤光片对提高光电阴极初始对比度的效果,提出一种提高夜视仪器对景物的鉴别能力的途径,并利用光电阴极对景物的光电流密度差分布曲线,综合分析微光物镜设计中选择的最佳波段及与滤光片的匹配关系。
In order to improve the discrimination ability of low-light night-vision instruments, this paper discusses a graphical analysis method of choosing the best working wavelength band and cut-off filter reasonably in the design of glimmer objective and describes the working overview of glimmer objective lens, Radiation characteristics and the relative sensitivity of the cathode surface, but also provides several typical photocathode photocurrent density response to the difference between the distribution curve. Taking the current density response difference curve of S_ (25) photocathode under the moonlight as an example, the concept of integral and the curve were used to analyze the effect of adding the cut-off filter to improve the photocathode The author proposed a way to improve the ability of night vision equipment to identify the scene. By using the curve of photocurrent density difference of the photocathode, the best selected wavelength band in the design of the glittering objective lens and the correlation with the filter Match the film.