视场角和定位误差在光谱辐射亮度测量中的影响  

Influence of field of view angle and positioning error on spectral radiance measurement

作　　者：何思捷 代彩红[1] 程秋桐 吴志峰[1] 李玲[1] 王彦飞[1] HE Sijie;DAI Caihong;CHENG Qiutong;WU Zhifeng;LI Ling;WANG Yanfei(Institute of Optics and Laser Metrology,National Institute of Metrology,Beijing 100013,China)

机构地区：[1]中国计量科学研究院光学与激光计量科学研究所,北京100013

出　　处：《应用光学》2023年第2期386-391,共6页Journal of Applied Optics

基　　金：国家重点研发计划(2018YFB0504800,2018YFB0504804);中国计量科学研究院基本科研业务费重点领域(AKYZD2210)。

摘　　要：为了减小不同光谱辐射计间瞄准区域差异带来的光谱辐射亮度不一致性,讨论了视场角及定位对于测量准确性的影响。通过建立太阳光白板和卤钨灯白板系统光路下的光谱辐射亮度测量模型,分析了不同几何光路视场区域平均辐射亮度与中心辐射亮度的差异。数值模拟表明,太阳光白板光路修正因子仅与视场角大小有关;卤钨灯白板光路修正因子随测量距离增大而减小,距离600 mm时8°和14°视场角的修正因子分别变为0.993 5和0.980 2。最后,实验验证了卤钨灯白板系统下角度误差和位移误差对光谱辐射亮度的影响。结果表明,修正因子对水平方向的角度误差和位移误差呈现非对称性,两侧差异高达2%。因此,依据视场角和几何定位可以对测量结果进行数据修正,有助于提升光谱辐射亮度测量不确定度水平。In order to reduce the inconsistency of spectral radiance caused by the aiming area differences between different spectroradiometers, the influence of field of view(FOV) angle and positioning on measurement accuracy was discussed. By establishing the spectral radiance measurement model of sunlight whiteboard and tungsten halogen lamp whiteboard, the differences between the average radiance and central radiance in the field of view of different geometric optical paths were analyzed. Numerical simulation shows that the correction factor of sunlight whiteboard path is only related to the size of FOV angle, while that of tungsten halogen lamp whiteboard path decreases with the increases of the measurement distance. When the distance is 600 mm, the correction factor of 8° and 14° FOV angle changes to 0.993 5 and 0.980 2, respectively.Finally, the experiment verified the influence of the angle error and displacement error on spectral radiance when using the tungsten halogen lamp whiteboard system. The results show that the correction factor presents asymmetry to the horizontal angle error and displacement error, and the difference between the two sides is as high as 2%. Therefore, the measurement results can be corrected according to the FOV angle and geometric positioning, which helps to improve the uncertainty level of spectral radiance measurement.

关 键 词：光谱辐射计 光谱辐射亮度 视场角 修正因子 

分 类 号：TN206[电子电信—物理电子学] O432.1[机械工程—光学工程]