The construction and the performance of a double-beam Michelson-type Fourier spectrometer are described. The instrument covers a wavenumber range from 10 cm-1 to 450 cm-1 with a maximum resolution of 0.025 cm-1 and an accuracy of frequency within ±0.001 cm-1. The optical path difference is measured by means of an He-Ne gas laser. To illustrate the general performance of the instrument, the pure rotational spectra of H2O and CO have been recorded.
Jyrki Kauppinen, "Double-beam high resolution Fourier spectrometer for the far infrared," Appl. Opt. 14, 1987-1992 (1975)