Comparison of Spectral Radiance Calibrations of Spectroradiometer for Ultraviolet Space Remote Sensing Using Three Calibration Techniques

Three techniques of spectral radiance calibration,one based on the flat diffuser and the other two based on internally illuminated integrating sphere,are applied.The radiance responsivities of the spectroradiometer under development for ultraviolet remote sensing in space have been obtained using these three calibration techniques.A preliminary analysis of uncertainties of these techniques points out that the uncertainties in measurements of the diffuser bidirectional reflectance distribution on function(BRDF) and the calculation of the radiance of the flat diffuser are the major sources for the discrepancy among the comparisons of these three techniques.The comparisons of calibration data show that radiance responsivities of the spectroradiometer derived using these three techniques are consistent within the uncertainties (3%) designated to them,respectively.