衍射复眼望远镜系统光学特性分析

Optical Characteristic Analysis of the Diffractive Compound Telescope

衍射复眼望远镜是将衍射物镜和按生物复眼结构排列的目镜组结合在一起的新型空间光学成像系统。文中首先介绍了该系统的结构特点,根据衍射物镜的衍射效率计算公式,在ASAP软件中对设计波长下的子目镜系统进行了分析,证明该系统视场角可扩展至±2°;对非设计波长λF下系统的成像信噪比进行详细分析,其中0通道子目镜中心和边缘视场信噪比分别为57.19dB、47.2dB,其它通道相应信噪比均有所下降。在物镜、目镜分离情况下,对非成像光源、由机械结构产生的二次杂光进行了分析。综合分析表明,系统在±2°范围内可成清晰图像,且图像中心信噪比高于边缘。最后,通过实验分别对中心和边缘子目镜系统成像,证实了上述分析结果的正确性。

The diffractive compound telescope system 1s a novel Klna oi space ~）pucaJ u^agmg a.y the diffractive lens with the compound eyes together. Firstly, the structure of the system is introduced in this paper. With the diffraction efficiency calculation for the diffractive lens, the field of view （FOV） of the system is approved to be ±2 with different eyepieces in ASAP; The SNR for the system with a non-designed wavelength , is detailed analyzed, the SNR for the center and edge FOV of the channel 0 are 57.19dB, 47.2dB, and the SNR for non-zero channel de- scend from the channel 0. When the diffractive lens is put separately from the eyepieces, the second stray light caused by the non-imaging source and mechanical structure is analyzed. Analysis showed that the system can image clearly in ± 2 FOV with the center SNR higher highar the edge.Finally, the correctness of analysis results is confirmed through the cen- ter and the edge eyepiece system imaging.