提出了一种分区多点标定的辐射定标方法。定标原理如下:将测量目标的温度区间分为n个子区间,测量并记录目标温度区间内n+1个不同温度黑体对应的红外光谱辐射计输出数据,并分别计算各个子区间的定标系数;进行红外光谱辐射测量时,比对红外光谱辐射计输出数据和记录数据,确定待测目标所属温度子区间;使用对应子区间的定标系数进行辐射定标,以提高测量精度。使用该方法对研制的渐变滤光片型红外光谱辐射计进行辐射定标,并根据定标结果反演测量黑体的等效亮温温差。实验结果表明,该方法的辐射定标精度优于1.5 K,可应用于红外光谱辐射计的辐射定标。

As a wide spectral range and high resolution infrared spectroradiometer based on linear variable filters has been developed, a new sub-region multi-point calibration method is proposed. Its calibration principle is as follows. First, divide the target temperature region into n sub-regions, measure and record the infrared spectroradiometer data corresponding to n+1 blackbodies with different temperatures in the target region, and calculate the calibration coefficient for each sub-region. During the measurement of an unknown radiation spectrum, compare the blackbody spectra previously measured at calibration temperatures in order to find the proper sub-region. Use the corresponding calibration coefficient for calibration in order to improve measurement accuracy. We use this calibration method to calibrate a self-developed linear variable filter-based spectroradiometer and inverse the blackbody temperature error according to calibration results. The experiment results show that the calibration accuracy better than 1.5 K is achieved, and the proposed method can be used for radiometric calibration of infrared spectroradiometers.