Abstract: Recently, Bomem developed CATSI, a small FTIR system referred to as the Compact ATmospheric Sounding Interferometer. In order to meet the highest radiometric precision and accuracy, the instruments performs calibrations, using observations of hot and cold blackbody reference sources as the basis for a two-point calibration at each wavenumber. This paper presents the results of the analysis of the radiometric calibration of this instrument, with emphasis on the temporal behavior of the instrument response.!4
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