Measurement, Correction and Validation of Out-of-Band Response for Multi-spectral Remote Sensing Instruments

Out-of-band response (out-of-band light leaks) is a significant uncertainty factor in multi-spectral remote sensing instruments radiometric calibration. In this paper, a method using a spectrum-tunable reference light source (STIS) which possess new functions of continuous and discrete spectral coverage to measure, correct and validate the 443 nm band of a multi-spectral camera has been mentioned. Adjusting STIS output two discrete radiance spectrum with its spectral width of about 50 nm in the out-of-band spectral region to directly measure out-of-band radiance responsivity. Correcting out-of-band response via spectral radiance measured by reference spectral radiometer and out-of-band radiance responsivity with the help of out-of-band response correction model. Validating out-of-band response correction accuracy via contrasting the relative departure between band-weighted radiance measurement of 443 nm band with out-of-band response correction and reference spectral radiometer measurement, under the conditions of measuring the test continuous spectrum produced by STIS. The result shows that the relative departure between the band-weighted radiance and the reference is decreased from 8.8 to 3.1% before and after the out-of-band response correction. The results demonstrate that STIS is suitable for measuring, correcting and validating the out-of-band response of multi-spectral remote instruments.