Measurement of the relative spectral radiance responsivity of the three EarthCARE flight model Broad Band Radiometers

摘要

The calibration of the absolute spectral radiance responsivity of the three Broad Band Radiometers (BBRs), which are due to fly on board the EarthCARE mission, consists of measuring the relative spectral radiance responsivity of these instruments over the wavelength range of interest, in combination with the measurement of the absolute spectral radiance responsivity of the same radiometers at certain wavelengths in the UV and visible. This presentation describes how NPL calibrated the relative spectral radiance responsivity of the three Flight Model (FM) BBRs in the 0.24 μm to 24.1 μm wavelength range. The procedures used and the results obtained are summarised. The associated measurement uncertainties are also presented.