一种折反二次成像式长波光学系统的杂散光抑制

讨论了一种折反二次成像式长波红外光学系统的杂散光抑制方法，该光学系统采用R-C反射式结构和二次成像光路，用于小型低成本红外成像制导系统。利用LightTools软件仿真找出光学系统中的主要杂散光来源和传输路径，结合仿真分析结果设计出了合适的机械拦光结构。然后在LightTools中建立了光学机械结构模型针对杂散光抑制进行了迭代设计，并对杂散光抑制效果进行了仿真验证。设计的光学系统加工、装配完成后进行了太阳杂散光抑制试验，仿真和试验结果表明:太阳夹角7以外不存在杂散光干扰，可以满足系统杂光抑制要求。

Suppression of stray light in a catadioptric and re-imaging LWIR system

Stray light suppression in a catadioptric and re-imaging LWIR system was discussed. The optical system which comprised a classical R-C reflective optics and a re-imaging refractive optics was designed for a compact and low-cost ⅡR seeker. The source and path of stray light in this system were investigated by simulating the optic-mechanical model with LightTools. According to the simulation, the mechanical light stops were built, and the performance of stray light suppression was analyzed. After assembled, the optical system and its anti-stray light effect were evaluated by testing the angle limit away from the sun. The results of simulation and test indicate that there is no influence of stray light on the LWIR system outside 7 from optical axis.