摘要
杂散光抑制是空间天文望远镜设计的重要部分,其中地气光的抑制较为复杂。为分析空间天文望远镜所处环境的地气光,以一典型空间天文望远镜为例,基于辐射传输理论,建立了其关键部位—太阳挡板的地气光辐照度计算模型。基于该模型,仿真得到了不同工况下地气光在挡板处的分布特性,并计算了望远镜通光口处一次地气光和二次地气光的辐射通量。计算结果表明:对于低轨道的空间天文望远镜,太阳挡板是关键杂光源,其引入的二次地气光影响大于直接进入望远镜通光口处的一次地气光,在进行杂散光抑制设计时,应重点考虑。
Suppression of stray light is a crucial part of space-based telescope （SBT） design. The suppression of earth-atmosphere radiation （EAR） is complicated. In order to analyze the EAR of SBT in its ambient environment, a computational model of EAR irradiance on sunlight baffle, which is one of the key components of SBT, is constructed by taking a typical SBT into consideration and using the irradiation transmission theory. Based on the as-constructed model, distribution character of EAR on baffle under various operating conditions is simulated. And radiant flux of primary and secondary EAR at light aperture of telescope is also calculated. The computation results indicate that sunlight baffle is the major stray light source for SBT working on low earth orbit （LEO）, and the secondary EAR from sunlight baffle affects much more than the primary EAR, which directly passes into telescope at light aperture. Therefore, serious consideration on the secondary EAR from sunlight baffle should be taken into the design of stray-light suppression.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第9期122-128,共7页
Laser & Optoelectronics Progress
关键词
光学设计
空间天文望远镜
地气光
辐照度分布
近地轨道
optical design
space based telescope
earth-atmosphere radiation
irradiance distribution
low earth orbit
