Fourier Transform Spectrometers provide variable resolution spectra, rapid measurements and flexibility in data display. However, their high photometric accuracy can be destroyed by sampling requirements. Geometrical and index of refraction considerations must be taken into account to extract the inherent precision of the instrument.
"Problems In Optical Measurements With Fourier Transform Spectrometers", Proc. SPIE 0153, Advances in Optical Metrology I, (15 December 1978); doi: 10.1117/12.938220; https://doi.org/10.1117/12.938220