光学 精密工程, 2011, 19 (12): 2854, 网络出版: 2011-12-22
白天观测空间目标的恒星光电探测系统的杂散光抑制
Stray light suppression of star photoelectric detection system for space target in daytime
望远镜 杂散光 光电探测 遮光罩 挡光环 点源透射率 telescope stray light photoelectric detection main baffle baffle vane Point Source Transmission(PST)
摘要
从恒星光电探测系统的杂散光光源入手, 分析了杂散光的产生和传输特性, 建立了杂散光对恒星光电探测系统影响的评价指标, 然后提出了合理抑制杂散光的方案, 用于指导光机系统的结构设计。通过遮光罩、挡光环以及表面涂层处理技术来削弱杂散光对光机系统的影响, 利用软件对该光机系统结构进行杂散光模拟分析。对比模拟工况下消除杂散光前后的点源透射率(PST)曲线, 结果表明光机系统探测像面PST下降了两个数量级, 达到10-8~10-10。场外星等探测得到的现场数据进一步证明, 该设计方案可以有效地抑制杂散光对光电探测系统的影响, 从空间背景中提取出五等星探测图, 得到了清晰的探测图像。
Abstract
In consideration of stray light sources of a star photoelectric-detection system, this paper analyzes the generation of the stray light and its transmission characteristics, and proposes how to evaluate the effects of stray light on the photoelectric-detection system. A reasonable suppression scheme for the stray light is provided for guiding the design of opto-mechanical structure of the system. Then the main baffle, baffle vane and the coating technology are used to eliminate the effect of stray light on the opto-mechanical structure. The opto-mechanical structure of the system is simulated by a software and the results show that their Point Source Transmittances (PSTs) before and after eliminating the stray light have been reduced by two orders of magnitude between 10-8 and 10-10. Meanwhile, the obtained detection data in experimental field demonstrate that the scheme can extract a detection im-age with 5 star magnitudes, and the stray light has been suppressed effectively.
王一凡, 李零印. 白天观测空间目标的恒星光电探测系统的杂散光抑制[J]. 光学 精密工程, 2011, 19(12): 2854. WANG Yi-fan, LI Ling-yin. Stray light suppression of star photoelectric detection system for space target in daytime[J]. Optics and Precision Engineering, 2011, 19(12): 2854.