A Grubb Parsons interferometric spectrometer has been modified for low-temperature solid-state studies in the spectral region of 5 to 400 wavenumbers. The cryogenic, spectrographic, and computational techniques are considered in detail.
R. G. WHEELER and J. C. HILL, "Spectroscopy in the 5 to 400 Wavenumber Region with the Grubb Parsons Interferometric Spectrometer," J. Opt. Soc. Am. 56, 657-665 (1966)