提出一种根据环境温度变化量补偿红外光谱仪系统输出灰度值的辐射定标方法。首先分析了在辐射定标和测量过程中红外光谱仪系统输出灰度值漂移的原因,推导出漂移变化量和环境温度辐射度变化量的函数关系;然后利用自主研发的非制冷型长波红外光栅光谱仪进行辐射定标实验,确定了实验室辐射定标方程和环境温度改变后通过补偿得到的辐射定标方程;最后通过实验验证了在不同环境温度下利用补偿后的辐射定标方程进行辐射测量的准确性。结果表明:在不同的环境温度下,通过漂移补偿可使光谱仪系统输出灰度值误差明显减小,其误差不超过2.4%,显著提高了非制冷型长波红外光谱仪对红外辐射的测量精度。

A radiation calibration method is proposed for the compensation of output gray values of an infrared spectrometer system based on the variation in ambient temperature. First, the reasons for the output gray-value shift of the infrared spectrometer system in the process of radiation calibration and measurement are analyzed; subsequently, the functional relationship between the change of drift and ambient temperature radiation is obtained. Then, the laboratory radiation calibration equation and radiation calibration equation at different ambient temperatures after compensation are determined by experimental radiation calibration using the uncooled long-wave infrared grating spectrometer developed in our laboratory. Finally, the accuracy of the radiation measurement using the compensated radiation calibration equation at different ambient temperatures is experimentally verified. The results show that the output gray-value error of the spectrometer system can be significantly reduced by drift compensation at different ambient temperatures, and the error is less than 2.4%. The measurement accuracy of the uncooled long-wave infrared spectrometer for infrared radiation is greatly improved in this research.