微光夜视仪的最大作用距离是它主要的技术指标和进行系统设计的主要依据。根据前人的研究,系统总结了微光夜视系统的视距公式。为改变微光夜视系统易受外界影响的缺点,一般需要再加入激光助视系统。加入激光助视系统之后光源的类型发生变化,视距公式也会随之发生改变,其中最主要的是光谱匹配系数的变化,还有照度、对比度、反射率等都随之发生变化。详细分析了加入激光之后视距公式中各因子发生的变化,为合理选择激光类型提供理论参考。并且估算了头盔式微光夜间驾驶仪(其中所用光电阴极为超二代管)在激光助视下的视距。验证了选取激光类型的合理性。

The maximal visual range of low light level (LLL) imaging apparatus is a basic guideline in system's design. Based on the early work, the visual range equation of LLL imaging system has been summarized. The laser aids system is used in order to improve its watching ability in bad weather. If so, there would be changed in the equation of visual range, especially the spectral matching factor. What's more, the illumination, contrast, reflectivity and so on would be changed. The changes about these factors after the adding of the laser are discussed, which can help choosing the lasers. The visual range of the super second generation image intensifiers under the laser aids is estimated, which proved the laser (λ=850 nm) is reasonable.