Stray light analysis of three-mirror off-axis space optical telescope

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Stray light analysis of three-mirror off-axis space optical telescope

Article | 更新时间：2020-08-12

- Stray light analysis of three-mirror off-axis space optical telescope
- Optics and Precision Engineering Vol. 18, Issue 2, Pages: 289-293(2010)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所2. 长春光学精密机械与物理研究所3. 长春光学精密机械与物理研究所研究生部
- 作者简介：
- 基金信息：
- DOI：
  CLC： O439
- Received：04 November 2008，
  
  Revised：10 December 2008，
  
  Published Online：20 February 2010，
  
  Published：20 February 2010
- 稿件说明：
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许杰,颜昌翔,彭岩. 离轴三反空间光学望远系统杂散光分析[J]. 光学精密工程, 2010,18(2):289-293

Stray light analysis of three-mirror off-axis space optical telescope[J]. Optics and precision engineering, 2010, 18(2): 289-293.
许杰,颜昌翔,彭岩. 离轴三反空间光学望远系统杂散光分析[J]. 光学精密工程, 2010,18(2):289-293 DOI：

Stray light analysis of three-mirror off-axis space optical telescope[J]. Optics and precision engineering, 2010, 18(2): 289-293. DOI：

摘要

以点源透过率（PST）为评价标准，给出了一种离轴三反空间望远系统的杂散光分析结果。通过建立系统的实体模型，确定了一次、二次散射路径，采用改进型的蒙特卡洛法，对 20°间离轴角分别进行光线追迹。对模型的分析结果表明，系统杂散光产生的主要因素为一次散射，与光学系统结构密切相关。 0.1°离轴角PST分别等于3.56和4.02， 20°离轴角PST等于6.63×10-5和4.48×10－5，可通过减小镜面散射率进行改进。与离轴两反望远系统相比，三反系统的杂散光水平在大离轴角时偏大1到2个数量级，但满足使用要求。

Abstract

Stray light analysis results to a three-mirror off-axis space telescope was present in this article with the measurement of PST (Point Source Transmittance ). The entity model of the system was built to determine the first and second order scattering paths. The result was calculated by the improved Monte Carlo raytrace method between 20° off-axis angle. It was demonstrated that the stray lights mainly composed with the first order scattering

and was coincident closely with the structure of the optical system. The PST equaled to 3.56 and 4.02 at 0.1° off-axis angle

6.63×10-5 and 4.48×10－5 at 20° off-axis angle. Comparing with the two-mirror off-axis telescope

the stray light of three-mirror system was graveness at the big off-axis angle

and could be reduced by changing the mirror’s scatting rate. The result indicated that it could meet the requirement.

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