Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ssrv...17..691b&link_type=abstract
(Workshop on Coherent Detection in Astronomy, Rhenen, Netherlands, Apr. 25, 26, 1974.) Space Science Reviews, vol. 17, July 1975
Astronomy and Astrophysics
Astronomy
12
Far Infrared Radiation, Infrared Astronomy, Infrared Detectors, Mixing Circuits, Optical Heterodyning, Signal To Noise Ratios, Background Radiation, Photoconductors, Receivers, Signal Mixing, Thermal Radiation
Scientific paper
The theory of heterodyne radiation receivers for the infrared and far-infrared is reviewed. For simplicity, only systems based on photoemissive and photoconductive radiation mixers are considered. The signal-to-noise ratio is derived, and expressions for this quantity under various conditions are given. A brief comparison is made between heterodyne systems and high-resolution spectrometers using direct radiation detectors. It is concluded that for high spectral resolving powers and for relatively small astronomical sources, heterodyne systems are likely to offer a distinct advantage in signal-to-noise ratio, especially at long far-infrared wavelengths.
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