大口径红外辐射计的光谱定标

Spectral Calibration for the Large Aperture Infrared Radiometer

介绍了大口径红外辐射计的光谱定标方法。研制了大口径红外辐射计。该辐射计主要由前置光学系统,红外探测器(热释电探测器和碲镉汞探测器2～14μm),机械斩波器,锁相放大器,信号采集器等组成。首先对大口径红外辐射计的光谱定标方法进行了分析,然后建立红外辐射计光谱定标的测量装置,并分别测试腔体热释电探测器和HgCdTe探测器的响应非线性,最后用腔体热释电探测器在该测量装置上对HgCdTe探测器进行红外光谱响应度校准实验。通过两种相对光谱响应度测量方法的对比,给出多次测量结果的平均值及两种方法的对比分析。分析结果表明,测量系统的不确定度优于3.4%。

The present paper introduced a spectral calibration method to calibrate a large aperture infrared radiation facility. We developed a radiometer which consisted of optical system, infrared detectors（cavity pyroelectric detector and HgCdTe detector 2 -14 μm）, fine mechanical modulator, lock in amplifier, signal processor, etc. At first, we analyzed the method on how to measure the spectral calibration of the large aperture infrared radiometer, and established the spectral calibration facility. Then, we tested the nonlinear response for the cavity pyroelectric detector and HgCdTe detector. Finally, we used the cavity pyroelee- trie detector to calibrate the relative spectral responsivity of HgCdTe detector at several wavelengths on the facility. Through the comparison of the two methods for measuring the relative spectral responsivity, the average of multiple measurements and com- parative analysis of two methods were giverL The uncertainty analysis of the whole system showed that the measurement uncer- tainty of the facility was better than 3. 4 %.