带外响应(带外泄漏)是影响多光谱遥感器(multi-spectral remote sensor, MsRS)辐射定标不确定度的重要因素。以多光 谱成像仪的443 nm通道为例,介绍了一种MsRS带外响应的测量、校正和精度验证方法。该方法主要利用一种新型大孔径光谱 可调积分球参考光源(spectrum-tunable integrating spheres reference light source, STIS)的分立波段和连续光谱 输出功能开展多光谱成像仪带外响应测量、校正及其精度验证实验,借助带外响应校正模型修正带内权重辐亮度,并与光谱 辐亮度计的测量参考值进行对比。结果表明,带外响应校正前后的带内WRL与光谱辐亮度计的测量参考值的差异由8.8%降 低到2.9%,初步验证了STIS在MsRS带外响应校正中的应用可行性。

Out-of-band response (out-of-band light leakage) is a significant factor affecting the radiometric calibration uncertainty of multispectral remote sensor (MsRS). For the MsRs out-of-band response measurement, correction and precision verification, the 443 nm band in multispectral imager using the functions of a novel spectrum-tunable integrating spheres reference light source (STIS) (i.e. discrete waveband and continuous spectrum output functions) was taken for example in batch experiments. After carrying out the out-of-band response measurement, correction and precision verification of multispectral imager, the weighted radiant luminance was amended based on the out-of-band response correction model, and compared with the measuring reference of spectral radiance meter. The results show that the difference between in-band weighted radiant luminance and measuring reference before and after the out-of-band response correction decreases from 8.8% to 2.9%, which confirms the application feasibility of STIS on the MsRS out-of-band response correction.