以卡塞格伦结构为例,利用ASAP光学分析软件,建立了红外光学系统的三维仿真模型,在光学元件表面存在均匀分布和非均匀分布的微粒污染情况下,对红外光学系统的杂散辐射特性进行了仿真和比较分析,对影响系统杂散辐射特性的主要因素进行了讨论,并对系统中机械元件的杂散辐射路径进行了分析。在此基础上,采用有效发射率对系统的杂散辐射性能进行了评价,讨论了镜面污染程度对红外光学系统杂散辐射性能的影响。

In this paper, taking Cassegrain as a typical example and using the optical analysis software(ASAP), the three-dimensional simulation model of the infrared optical system was built up. The stray light performances of the system were simulated and analyzed when the optics was contaminated by the particles with the uniform distributed and the non-uniform distributed. The main factors affecting the stray light performance of the system were discussed in detail and the stray light paths of the mechanical components were analyzed. Furtermore, the effective emissivity was introduced to evaluate the stray light performance of the system. Finally, the influence of the optics contaminated level on the stray light performance of the infrared optical system was discussed.