大视场红外折反光学系统杂散光分析

杂散光分析是保证光学系统成像质量的关键技术之一，根据红外光学系统杂散光的定义，指出大视场红外光学系统的杂光来源，以及杂光对系统的影响，并且建立了消杂光结构。在消杂结构中，为了减少内部辐射，遮光罩内部使用反射式挡光环。采用TracePro软件对系统进行建模、仿真分析，结果表明此红外光学系统的杂散光得到很好的抑制:太阳杂光抑制水平PST可以达到10-5～10-8，内部辐射到达像面杂散光能量量级为10-10 Ｗ，系统可以实现清晰成像。

Stray light analysis of catadioptric infrared optical system with large field

Stray light analysis in optical system is a key technology to ensure the system's quality. According to the definition of stray light, the sources of stray light in infrared optical system and the effect of stray light were pointed out in this paper. In view of stray light source, a structure of suppressing stray light was established. In order to reduce the internal radiation, reflective vanes were used. TracePro software was also used to build the system model and simulate analysis of the system. The results indicate that stray light is well suppressed, and the system's PST can achieve a level of 10-5-10-8. At the same time, the internal radiation energy that gets to imager can achieve a level of 10-10 W. So the system can achieve a clear image.