Effect of intrinsic background radiation on the operation of a Fourier spectroradiometer

This paper discusses how the intrinsic background radiation of a Fourier spectroradiometer affects the results of the processing of two-sided interferograms. The operation of a Michelson interferometer is considered theoretically, and it is shown that, when objects with radiance temperatures close to the intrinsic temperature of the spectrometer are observed, inverted spectral sections and bands may appear in the final spectrum. The paper proposes an algorithm for correcting the initial interferograms and an experimental technique that makes it possible to eliminate the inversion of the spectrum and to compensate the intrinsic background radiation of the interferometer.