Measurement and elimination of stray light from space solar telescopes for imaging test at UV band

YANG Lin; LI Da; CUI Tian-gang; CHEN Bo

doi:10.3788/OPE.20111907.1456

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Measurement and elimination of stray light from space solar telescopes for imaging test at UV band

Article | 更新时间：2020-08-12

- Measurement and elimination of stray light from space solar telescopes for imaging test at UV band
- Optics and Precision Engineering Vol. 19, Issue 7, Pages: 1456-1463(2011)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,130022
  2. 中国科学院研究生院北京,100039
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111907.1456
  CLC： TH751;P111.41
- Received：26 August 2010，
  
  Revised：29 November 2010，
  
  Published Online：25 July 2011，
  
  Published：25 July 2011
- 稿件说明：
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杨林, 李达, 崔天刚, 陈波. 空间太阳望远镜在紫外波段成像检测中的杂散光测量和消除[J]. 光学精密工程, 2011,19(7): 1456-1463

YANG Lin, LI Da, CUI Tian-gang, CHEN Bo. Measurement and elimination of stray light from space solar telescopes for imaging test at UV band[J]. Editorial Office of Optics and Precision Engineering, 2011,19(7): 1456-1463
杨林, 李达, 崔天刚, 陈波. 空间太阳望远镜在紫外波段成像检测中的杂散光测量和消除[J]. 光学精密工程, 2011,19(7): 1456-1463 DOI： 10.3788/OPE.20111907.1456.

YANG Lin, LI Da, CUI Tian-gang, CHEN Bo. Measurement and elimination of stray light from space solar telescopes for imaging test at UV band[J]. Editorial Office of Optics and Precision Engineering, 2011,19(7): 1456-1463 DOI： 10.3788/OPE.20111907.1456.

摘要

针对EUV太阳望远镜在地面非工作波段预先检测时出现的杂散光问题

考虑望远镜长焦距的特点

建立了基于反射镜转动扫描原理的杂散光测量系统

测量得到了望远镜的点源透射率(PST)曲线。通过对比PST曲线和分析望远镜结构

得出杂散光的主要来源为小角度下的一级杂光

由此设计了主次镜遮光罩

并利用Tracepro软件建立望远镜的实体模型

在不同散射表面的双向散射(BRDF)值条件下计算出遮光罩的消杂光效果。对PST实际测量结果表明

在0~4

使用遮光罩使杂散光减少3个数量级

杂光系数不超过3.65%。在分辨率成像测量中

杂散光影响得到消除

系统分辨率接近衍射极限

满足地面上紫外光波段的测量要求。

Abstract

For the stray light from an Extreme Ultraviolet (EUV) solar telescope in the ground experiment

a measurement system for the Point Source Transmittance (PST) was established based on the parallel light introduced by the rotary scanning mirror at various angles and the PST curves were applied to assess the stray light level. By analyzing the structure of the telescope and the measured PST curves

the first order stray light under a small angle range was proved to be the main source of stray light.To eliminate the stray light

the principles of the baffles were presented in details and the simulation modeling of the telescope with baffles was created by Tracepro software. The eliminating ability of the baffle was calculated and tested at different Bidirectional Reflectance Distribution Function (BRDF) values. The test results show that the baffles can block most of the first order stray lights

the intensity of stray light has reduced 3 orders of magnitude

and the corresponding veiling glare index is less than 3.65%. With the help of baffles

the EUV telescope performs near the diffraction-limited condition at UV band

and all the requests for the imaging test can be met.

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references

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