Sensitivity of an astronomical infrared heterodyne spectrometer

Details Sensitivity of an astronomical infrared heterodyne spectrometer Sensitivity of an astronomical infrared heterodyne spectrometer

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976infph..16...61k&link_type=abstract

(International Conference on Infrared Physics, Zurich, Switzerland, Aug. 11-15, 1975.) Infrared Physics, vol. 16, Jan.-Mar. 1976

Astronomy and Astrophysics

Astronomy

2

Infrared Astronomy, Infrared Spectrometers, Optical Heterodyning, Beam Splitters, Infrared Detectors, Line Spectra, Sensitivity, Shot Noise, Spectral Line Width

Scientific paper

The factors determining the sensitivity of a real astronomical heterodyne spectrometer are described. The deviation from the ideal heterodyne system for line detection is described in terms of a series of degradation factors. A discussion of degradation due to a low local oscillator power and to line profile detection is presented. Representative values for the degradation factors are given. Even with a total degradation of not less than 30, the heterodyne spectrometer is still found to be a highly sensitive tool in IR astronomy.

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