针对微光夜视系统可靠性试验的需要,在实验室准确模拟微光夜视系统在自然条件下所受的光应力具有重大意义。野外自然微光主要由月光、星光、大气辉光及杂散光经多次漫反射而成,所以在不同的环境条件下形成的自然微光不同。为模拟出不同的微光应力源,在试验过程中需要改变平行光管出瞳处的光照度,并使其对微光夜视系统的作用与自然微光对微光夜视系统的作用相当。在实验室条件下,当平行光管的视场大于微光夜视系统的视场时,通过改变光源光照度的办法即可改变平行光管出瞳处的光照度,从而实现自然微光应力源的精确模拟,并通过实验验证了该方法的可行性。

Aiming at the requirements of the reliability test of low-light-level(LLL) night vision system,it is of great significance to accurately simulate light stress of LLL night vision system under natural conditions in the laboratory.In the wild field,natural LLL is mainly formed by the multiple diffuse reflections of moonlight,starlight and airglow and stray light.Therefore different natural light is formed by different environmental conditions.In the course of the experiment,the illumination of the collimator at the exit pupil is changed and its effect on LLL night vision system is equivalent to that of natural glimmer to simulate different natural LLL.Under experimental conditions,the light pipe field is larger than the field of view of the LLL night vision system,the illumination at exit pupil of parallel light pipes may be changed by changing the light source illumination to achieve the accurate simulation of natural light stress source.The feasibility of this method is verified by experiments.