Infrared heterodyne spectroscopy provides a means of measuring the intensity profiles of individual rotation-vibration spectral lines with high sensitivity. Considerable effort has been expended on optimizing these instruments for remote measurements of gases in planetary atmospheres with the result that present generation spectrometers now are beginning to provide new and startling results on the planets. In this paper, the fundamental principles of laser heterodyne spectroscopy are discussed. Detailed considerations of the optical design and of the electronic design of the spectral line receiver are given. Representative results obtained with this spectrometer are discussed, including precision frequency measurements of NH3 (1)2 ) lines, detection of auroral emission from Jupiter, and measurements of terrestrial 03 and CO2.
Michael J. Mumma,
"A 10µm Laser Heterodyne Spectrometer for Remote Detection of Trace Gases," Optical Engineering 17(1), 170150 (1 February 1978). https://doi.org/10.1117/12.7972178