反射式内掩日冕仪的光学设计与杂散光分析  

Stray light analysis of internally occulted mirror coronagraph

作　　者：李萍[1,2] 卢振武[1] 夏利东[3] 张红鑫[1] 刘英[1,2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,吉林长春130033 [2]中国科学院研究生院,北京100039 [3]山东大学空间科学与应用物理系,山东济南264209

出　　处：《中国光学与应用光学》2009年第5期408-413,共6页Chinese Optics and Applied Optics Abstracts

基　　金：国家自然科学基金资助项目(No.40774080)

摘　　要：日冕仪的工作特点决定了其对杂散光抑制要求极其严格。根据反射式日冕仪的工作特点,通过分析其光学特性以及其抑制系统杂散光的基本原理,设计了反射式内掩日冕仪系统,其相应参数为视场0.67°、口径47mm、焦距768mm、系统总长1200mm,系统在30lp/mm处的MTF值>0.6,弥散斑半径<2.5μm,成像质量达到衍射极限。通过分析系统杂散光特点,建立了消杂散光结构,全部抑制了系统的主要杂散光源。杂散光抑制水平达10-6～10-8B⊙,可以实现对日冕的清晰成像观测。The principle of coronagraph requires that stray light in coronagraph system must be kept at an extremely low level. Based on the principle of mirror coronagraph, a internally occulted mirror coronagraph is designed by analyzing its optical characters and the basic rules to suppress the stay light. This system with a FOV of 0. 67°, a aperture of 47 mm, a focal length of 768 mm and a total length of 1 200 mm shows that its MTF value at 30 lp/mm is above 0.6, the radius of spot is less than 2.5 μm, and the image quality of the system approaches to the difh-action limit. In consideration of the character of stray light in the system, a structure of suppressing stray light is built, and the main sources of stray light are suppressed entirely by the designed structure. The system can achieve a level of 10^-6 - 10^-8 B⊙ approximately in suppressing stray light, and it can get high quality coronal images.

关 键 词：反射式日内掩冕仪 光学设计 杂散光 

分 类 号：TH753.12[机械工程—仪器科学与技术]