| Related citation: | Yuchen Zhao,Yanjun Xu,Changzheng Chen,Fan Zhang,Jianyue Ren.Optical Design and Stray Light Analysis of the Space Infrared Optical System[J].Journal of Harbin Institute Of Technology(New Series),2017,24(1):32-36.DOI:10.11916/j.issn.1005-9113.15176. |
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| Author Name | Affiliation | | Yuchen Zhao | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
University of Chinese Academy of Sciences, Beijing 100049, China | | Yanjun Xu | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China | | Changzheng Chen | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China | | Fan Zhang | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China | | Jianyue Ren | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China |
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| Abstract: |
| This article describes a novel configuration design for a re-imaging off-axis catadioptric space infrared optical system, and in order to satisfy the signal noise ratio requirements of the system, the stray light of the system is necessary to analyze and restrain. The optical system with a focal length of 1 200 mm, an entrance pupil diameter of 600 mm, an F-number of 2, a field of view of 3°×0.15°, a working wave band of 8 μm-10 μm, and the image quality of the optical system almost approach to diffraction limits in all field of view. Then the mathematical models of stray light are built, and the suppressive structure is established to eliminate the effect of stray light. Finally, TracePro is used to analyze and simulate stray light with and without the suppressive structure, and also get the results of the PST curves. The results indicate that appropriate optical system and suppressive structure can highly reduce the stray light of the space infrared optical system. |
| Key words: space infrared optical system off-axis optical system stray light Point Source Transmission (PST) |
| DOI：10.11916/j.issn.1005-9113.15176 |
| Clc Number:TN214 |
| Fund: |
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| Descriptions in Chinese: |
| 空间红外光学系统设计及杂散光分析
赵宇宸1,2，许艳军1，陈长征1，张帆1，任建岳1
（1. 中国科学院长春光学精密机械与物理研究所；
2. 中国科学院大学）
创新点说明：
1.杂散光是影响红外光学系统成像质量的重要因素之一，因此在光学设计之初就应该予以考虑。本文在光学设计过程中，根据杂散光抑制要求，最终采用了一种次、三镜成中间像面的离轴折反射式光学结构。
2.本文采用了一种新的光学结构形式，采用折叠镜折转光路，将折叠镜与三镜放置在主镜背板后部，通过主镜背板下部通光孔径使光学系统正常工作。这种结构安排可以减小系统的轴向尺寸，同时通光孔径可以起到光阑的作用，将折叠镜与三镜在空间上与其它光学元件隔离，减小系统的杂散光。
3.采用杂散光分析软件TracePro对系统进行模拟与仿真，计算得到了系统的外部杂散光量级，绘制PST曲线。通过分析与对比可以发现，系统很好的抑制了到达探测器的杂散光。
研究目的：
设计了一个焦距为1200mm，入瞳600mm，F数为2，视场为3°×0.15°，工作波长为8μm-10μm，成像质量接近衍射极限的光学系统，并对系统的杂散光进行了分析与设计。
研究方法：
采用软件建模仿真是杂散光分析与抑制的有效方法，在已知光学系统参数及系统工作环境的前提下，建立杂散光分析的数学模型，对系统的杂散光环境进行分析计算，通过与仿真结果的对比得到满足系统杂散光抑制要求的设计结构。
结果：
1. 从PST曲线可以看出，系统杂散光整体呈下降趋势，在离轴角度为10°到40°之间下降明显。
2. 在离轴角度为3°时，PST曲线量级达到10-5，与没有杂散光抑制结构系统对比提高了1-4个数量级。
3.在离轴角度为10°-30°范围内，-Y方向量级高于+Y方向，这是由于系统在Y方向上的非对称性所引起的。
4. 在离轴角度为15°到40°之间PST曲线有明显的波动，这是由于杂散光在挡光环上经过多次反射后进入系统探测器所造成的。
结论：
适当的光学系统及杂散光抑制结构可以对空间红外光学系统的杂散光进行有效的抑制。
关键词：空间红外光学系统，离轴光学系统，杂散光，点源透过率 |
