Computation of Fourier Interferograms: I. Undispersive two–beam interferograms for black-body radiation

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Abstract
Symmetrical Fourier or i -interferograms are computed for an ideal undispersive two-beam interferometer illuminated with black-body radiation of various radiation bandwidths. Interferograms of this kind are those termed background interferograms in practical Fourier spectrometry with broad-band thermal radiation. The agreement between the computed model interferograms and naturally recorded background interferograms for tungsten-filament radiation is surprisingly good. The model interferograms may therefore be very useful in understanding undispersive background interferograms.

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