title: Digitally pressure-scanned fabry-perot interferometer for studying weak spectral lines.
abstract: A system is described for digitally scanning a Fabry-Perot interferometer by changing the pressure of the gas in the interferometer chamber by small discrete steps. The system, intended for recording weak signals, i.e., of the order of a few counts per second, is very linear. Repetitive scans are reproduced within 1/640 of the spectral free range of the interferometer. An example of the depolarized Rayleigh line scattered by H(2) at 2.5 amagat is given.
authors.forename: V G
authors.initials: VG
authors.lastname: Cooper
authors.forename: B K
authors.initials: BK
authors.lastname: Gupta
authors.forename: A D
authors.initials: AD
authors.lastname: May