23 December 1994 Far-infrared Fabry-Perot spectrometer as satellite-based atmospheric limb sounder
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An excellent instrument to observe the emission lines of OH in the far infrared is a cooled scanning Fabry-Perot (FP) where the orders are selected by means of a grating monochromator. A compact liquid helium cooled prototype has been built for airplane missions. A similar device is the OHIO instrument, proposed for limb observations from a satellite and applying detectors in conjunction with space-qualified refrigerators. Compared with heterodyne receivers, an FP at 80 K offers a comparable sensitivity in the 100 (mu) wavelength region and much better values with bolometric detectors optimized for lower temperatures. Compared to satellite-borne Fourier Transform Spectrometers (FTS), the FP instrument is more sensitive at 80 K; the FTS measures many superfluous spectral elements. The FP is superior at temperatures low enough to allow photon-noise-limited detector operation.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan J. Wijnbergen, Paul de Valk, John P. Burrows, Kelly Van Chance, Wolfgang Schneider, "Far-infrared Fabry-Perot spectrometer as satellite-based atmospheric limb sounder", Proc. SPIE 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II, (23 December 1994); doi: 10.1117/12.196687; https://doi.org/10.1117/12.196687

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