圆形渐变滤光片光谱辐射计辐射定标  

Radiometric Calibration of Circular Variable Filter Type Spectroradiometer

作　　者：向昆竹 施海亮[1,2,3] 孙熊伟 朱锋 王先华 叶函函[1,3] Xiang Kunzhu;Shi Hailiang;Sun Xiongwei;Zhu Feng;Wang Xianhua;Ye Hanhan(Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;University of Science and Technology of China,Hefei 230026,Anhui,China;Key Laboratory of Optical Calibration and Characterization of Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]中国科学院通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2023年第23期107-117,共11页Acta Optica Sinica

基　　金：中国科学院重点部署项目(ZDRW-KT-2020-3)。

摘　　要：基于分区线性法对圆形渐变滤光片型光谱辐射计开展辐射定标研究,以解决温度范围大、工作波段宽的测量目标对该类型光谱辐射计造成的非线性问题。所提光谱辐射计的主要技术原理是将待测目标的温度区间分为多个子区间,采集目标温度区间内多个不同温度黑体对应的测量光谱,并计算各个温度下的响应度函数。在进行红外光谱测量时,将目标光谱与区间内记录的不同温度点光谱进行比对,从而确定待测目标所属温度子区间的上下限。根据子区间计算的响应度函数,通过线性插值求得待测目标的响应度函数并进行辐射定标。基于该方法的实验结果表明,待测目标理论辐亮度与使用分区线性法进行辐射定标得到的辐亮度在波长范围内的平均偏差小于1%。通过定标结果反演测量黑体的等效温度,等效温度误差小于2%。Objective Spectroradiometers are used to determine the spectral characteristics and brightness of radiation sources,which are widely used in many different fields.This study is based on the circular variable filter type spectroradiometer,where the wavelength transmitted by the main spectroscopic component,the circular variable filter is linearly related to the angle,and the spectroradiometer is constructed with a unit detector.This type of spectroradiometer has the advantages of a wide spectral range and a wide temperature range for the target,so it has a wider range of applications.However,there are fewer studies on circular variable filter spectroradiometers in China and abroad,and the development of domestic machines for circular variable filter spectroradiometers is gradually being carried out in China.Radiation calibration is the process of converting the original signal measured by the instrument into a physical quantity with practical significance.The main methods of radiation calibration for infrared spectroradiometers are currently the single point method,the two points method,and so on.The single point method is suitable for cases with low resolution and a small amount of spectral measurement data.The two-point method is suitable for situations where the instrument has good linearity,and the number of measurement points is high.Due to the wide operating band of the circular variable filter type infrared spectroradiometer and the wide range of the target temperature,which causes non-linearity problems,the traditional two-point calibration method cannot achieve accurate radiation calibration.In this paper,a divisional linearity-based responsivity radiometric calibration method is proposed to solve this problem.Methods The radiometric calibration of circular variable filter spectroradiometers is based on the divisional linearity method,which is used to solve the non-linearity problem of this type of spectroradiometer due to the large temperature range of the measurement target and the wide operating band.T

关 键 词：测量 红外光谱辐射计 圆形渐变滤光片 辐射定标 黑体 分区线性标定法 

分 类 号：TP732.2[自动化与计算机技术—检测技术与自动化装置]