基于自由曲面的辐射定标光源设计  

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

作　　者：田杰文 叶新[1] 方伟[1] TIAN Jie-wen;YE Xin;FANG Wei(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[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

出　　处：《中国光学（中英文）》2023年第1期127-135,共9页Chinese Optics

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

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。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 nonuniformity 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.

关 键 词：几何光学 照明设计 辐射定标 积分球光源 

分 类 号：O436[机械工程—光学工程]