A simple method of photoelectrically scanning a Fabry-Perot interferometer pattern is described. Scanning is accomplished by parallel displacement of the incident beam of light across the face of an interferometer whose plate separation varies in the direction of the displacement. This method of scanning allows a slightly distorted plot of the line profile to be continuously displayed on an oscilloscope.
WILLIAM L. BARR and ANDREW L. GARDNER, "A Scanning Fabry-Perot Interferometer," J. Opt. Soc. Am. 51, 1400-1401 (1961)