用于星敏感器的马蹄形卡塞格伦反射式光学系统杂散光抑制方法（英文）  

Stray radiation suppression of horseshoe Cassegrain reflecting optical system for star sensor

作　　者：胡晓东[1] 丁小昆[1] 王维科[1] 魏青[1] 

机构地区：[1]中国航空工业集团西安飞行自动控制研究所,西安710065

出　　处：《中国惯性技术学报》2016年第2期175-179,共5页Journal of Chinese Inertial Technology

基　　金：航空基金支撑项目(61901060301)

摘　　要：星敏感器是惯性天文组合导航系统的关键传感器,星敏感器的光学系统设计及对杂散光的抑制是决定其能否实现测星的主要因素。提出一种改进型的卡塞格伦反射光学系统,该系统通过摆镜折叠光路并实现扫描,压缩了系统的体积,增强了系统的灵活性。进而针对该系统设计了一种基于基生叶结构的遮光罩,利用光线追迹软件在不同方位和俯仰角度入射下对系统进行了仿真分析,结果表明规避角以外的点源透射比可以达到10?9以下,满足系统使用要求。此外,鉴于传统点源透射比方法的计算量较大,还引入了杂散光系数的概念,通过对镜像系统进行反向光线追迹可以将杂散光分离,从而计算出杂散光系数,表征系统对杂散光的抑制能力。该方法可降低计算量,提高设计效率。A modified horseshoe-shape Cassegrain reflecting optical system is presented. The light path is folded by a scanning mirror. The modified system becomes more compact and flexible. Consequently, a new type of optical baffle with radical leaf for effective stray light suppression is proposed. The stray light in different azimuth and pitching angles is analyzed. According to the simulated result, the point source transmittance is less than 10？9 when incident angles are larger than the rejection angle. Moreover, a reverse ray trace method is introduced. It describes the stray radiation suppression with stray light coefficient, which could be easily obtained without complicated computation and separate regular light from stray light. The result distinctly reflects the stray radiation suppression ability of the test system, and can provide helpful guidance for the design of optical baffle.

关 键 词：天文导航 星敏感器 卡塞格伦光学系统 杂散光 遮光罩 

分 类 号：O436[机械工程—光学工程]