基于自由曲面的辐射定标光源设计

田杰文; 叶新; 方伟

doi:10.37188/CO.2022-0021

基于自由曲面的辐射定标光源设计

doi: 10.37188/CO.2022-0021

田杰文^{1, 2,},
叶新^1, ,,
方伟^1,

1.
中国科学院长春光学精密机械与物理研究所, 长春 130033
2.
中国科学院大学, 北京 100049

基金项目: 国家重点研发计划项目资助（No. 2018YFB0504600，No. 2018YFB0504603）

详细信息

作者简介:
田杰文（1990—），男，吉林集安人，2013 年于长春理工大学获得学士学位，现就读中国科学院大学长春光学精密机械与物理研究所光学工程专业。主要研究方向为定标光源设计。E-mail：515100720@qq.com

叶　新（1979—），男，吉林吉林人，博士，研究员，博士生导师，主要从事光学遥感，地球辐射测量，太阳辐射测量，光谱辐射定标等方向的研究。E-mail：yexin@ciomp.ac.cn

方　伟（1965—），女，辽宁朝阳人，博士，研究员，博士生导师，主要从事光学遥感，太阳辐射测量，绝对辐射定标等方向的研究。E-mail：fangw@ciomp.ac.cn

通讯作者:
yexin@ciomp.ac.cn

中图分类号: O436
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出版历程
- 收稿日期: 2022-01-27
- 修回日期: 2022-02-17
- 网络出版日期: 2022-05-16

Design of a radiometric calibration light source based on a freeform reflector

TIAN Jie-wen^{1, 2
,},
YE Xin^{1
, ,},
FANG Wei^1
,

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences , Beijing 100049, China

Funds: Supported by the National Key R&D Program of China (No. 2018YFB0504600, No. 2018YFB0504603)

More Information

Corresponding author: yexin@ciomp.ac.cn

摘要

摘要:
为了减小对卫星上的空间使用，针对定标特点，本文提出了一种用于积分球光源准直照明的自由曲面反射镜设计方法。采用该方法，能够以小口径的积分球实现大面积的方形均匀辐照度分布。首先，通过点光源模型建立自由曲面离轴反射照明数学模型，然后，通过切比雪夫点离散自由曲面，并求解出满足点光源照明的自由曲面模型，最后，分析积分球的光源特性，通过逐步优化自由曲面能量分布方法完成点光源照明模型到积分球照明模型的转变。通过分析可知，设定照明面积为140 mm×140 mm时，目标面的辐照度非均匀性的不均匀度小于0.02。满足星载定标轻量化，短光路，结构简单的需求。
- 几何光学 /
- 照明设计 /
- 辐射定标 /
- 积分球光源
Abstract:
We propose a design method of a free-form reflector for collimating illumination of integrating spherical light sources to reduce the space occupation on a satellite. By using this method, a square irradiance distribution with large area can be achieved through a integrating sphere with small diameter. Firstly, the mathematical model of off-axis reflection lighting of free-form surface is established through the point light source model, then the free-form surface is discretized by Chebyshev points, and the free-form surface model that satisfies the point light source illumination is solved. Finally, the light source characteristics of the integrating sphere are analyzed. The transformation from the point light source illumination model to the integrating sphere illumination model is achieved by the optimization of the free-form surface energy distribution. The analysis results show that when the illumination area is set as 140 mm×140 mm, the irradiance non-uniformity of the target surface is less than 0.02. This method can meet the requirements of spaceborne calibration for light weight, short light path and simple structure.
- geometric optics /
- illumination design /
- radiometric calibration /
- integrating spherelight sources

HTML全文

图 1 自由曲面反射镜倾斜带来的影响

Figure 1. The influence caused by the tilt of freeform reflector

下载: 全尺寸图片幻灯片

图 2 自由曲面二维坐标系

Figure 2. Two-dimensional coordinate system of a freeform reflector

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图 3 自由曲面的设计原理

Figure 3. Design principle of freefrom reflector

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图 4 倾斜照明坐标系

Figure 4. Coordinate system of tilted illumination

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图 5 自由曲面的设计流程图

Figure 5. Design flow chart of freeform reflector

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图 6 切比雪夫点采样示意图

Figure 6. Schematic diagram of Chebyshev points sampling

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图 7 自由曲面反射镜的仿真示意图

Figure 7. Schematic diagram of simulated freeform reflector

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图 8 光路示意图

Figure 8. Schematic diagram of the optical path

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图 9 目标面辐照度示意图

Figure 9. Schematic diagram of irradiance on the target plane

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图 10 方形照明示意图

Figure 10. Schematic diagram of the square illumination area

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图 11 未优化前辐照度示意图

Figure 11. Schematic diagram of irradiance before optimization

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图 12 优化后照明示意图

Figure 12. Schematic diagram of irradiance after optimization

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表 1 自由曲面反射镜的相关参数

Table 1. Reference parameters of the freeform reflector

Parameters value

$ \theta $/(°) 15
r/mm 432
z/mm $ 900/\sqrt 2 $
F# 1.6

下载: 导出CSV

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