Simulation of low light level stress source in low light level night vision system tests

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.