月基光学天文望远镜(LOT)的杂散光分析  

Stray Light Analysis of the Lunar-based Optical Telescope

作　　者：李婷[1] 杨建峰[1] 阮萍[1] 姜晓军[2] 

机构地区：[1]中国科学院西安光学精密机械研究所 [2]中国科学院国家天文台,北京100012

出　　处：《光子学报》2007年第B06期136-141,共6页Acta Photonica Sinica

摘　　要：杂散光分析是保证月基光学天文望远镜(LOT)成像质量的关键技术之一.本文对月基光学天文望远镜进行了详细的杂散光分析,确定了系统的一次、二次散射路径.根据重要杂散光路径提出对主、次镜内遮光罩的改进方案,对改进后系统重新分析,计算了杂散光评价指标PST.和改进前相比,PST值降低了1～2个量级,离轴角为30°以后,PST值均达到10-10量级.The efficiency and data quality of lunar-based astronomical observations should be far more superior compare with ground-based observations due to the lack of the atmospheric effect, and placing an optical telescope on the lunar surface can offer the potential for solving many of outstanding problems in astrophysics, such as asteroseismological research and extrasolar planet detections. Stray light analysis is one of crucial technologies to ensure the image quality of Lunar-based Optical Telescope （LOT）. The detailed stray light analysis of the Lunar-based Optical Telescope is described in this paper. Firstly the first and second order scattering paths are determined, and proposals for modifying primary and secondary baffles are separately brought forward according to the important stray light paths. Secondly stray light analysis of the revised system is done and the PST values of the system are recalculated. Compared with before modification, the PST values have been reduced 1～2 orders, and PST values are less than 10^-10 when off-axis angle is larger than 30°. It satisfies the requirement of the system.

关 键 词：月基光学天文望远镜 杂散光分析 关键表面 散射路径 PST 

分 类 号：O439[机械工程—光学工程]