折/衍混合LWIR凝视成像系统的杂散光分析

本文对一折/衍混合长波红外(LWIR)凝视成像系统进行了杂散光分析，在此LWIR系统中，含有一个用金刚石车削技术制作的衍射光学元件(DOE)。本文中，对DOE的不同衍射级次、光学表面的多次反射、镜筒内壁的反射等主要杂散光源利用LightTools软件进行了分析，对6种二次反射的模拟结果表明，对归一化的光源，理想光路的像面辐照度为100 W/mm2，每种二次反射会给像面带来0.01W/mm2的辐照度；对于反射率为10％的镜筒内壁，带来的像面辐照为0.01W/mm2。并利用该LWIR凝视成像光学系统进行了相关实验，实验结果证明了上述分析的正确性，有利于对LWIR凝视成像系统光学性能的进一步理解和杂散光的抑制。

Stray light analysis of a diffractive/refractive LWIR staring imaging system

The stray light analysis of a diffractive/refractive long wavelength infrared (LWIR) staring imaging system is shown. In this LWIR system, there is one diffractive optical element(DOE) fabricated by the diamond turning technology. In this paper, three sources of the stray light- unwanted diffractive order light of the DOE, the multiple reflected light of the optical surface, and the reflected light from the inner side of the barrel- are analyzed with the help of LIGHTTOOLS software. From the simulation result of 6 twice-reflections, it is shown that when the source is moralized, which results in the irradiance of 100 W/mm2 at the image plane, the twice-reflection result in 0.01 W/mm2 at the image plane; the inner side of the barrel, which has 10％ reflection, result in 0.01 W/mm2 at the image plane. The analyzed result is approved by the image get from the LWIR system.