Research on simulated generator of optical target for low light level weapon sight

The environmental adaptability is one of the key factors to evaluate the operational performance of low-light-level sight. In this paper double-integrating-sphere in illumination-mode combined with collimator was adopted to design a simulated generator of infinite target in order to provide four different level light stresses environment needed for detecting the adaptability for low-light-level sight. First of all, for the actual application of the low-light-level sight in aiming and positioning at night and midnight, the illumination at the entrance pupil of the sight was calculated. And then the double-integrating-sphere and collimator were designed in accordance with the illumination. Finally, the output illumination of integrating sphere and simulated generator for infinite target simulation were analyzed and calculated, the results of experiment and measuring showed that the illumination non-uniformity is less than 2%, which can satisfy the application requirements.