Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ssrv...17..621v&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
1
Coherent Light, Infrared Astronomy, Optical Heterodyning, Signal Detection, Astronomical Photometry, Infrared Interferometers, Optical Equipment, Stellar Spectrophotometry, Superheterodyne Receivers
Scientific paper
A historical survey of heterodyne detection (HD) in astronomy is presented, taking into account the introduction of HD methods into the optical and infrared spectral regions after suitable coherent oscillators became available with the invention of the laser. The performance criteria of HD systems are examined. The usability of HD in spectrography and interferometry is determined by the signal-to-noise ratio, which determines the sensitivity, and the directivity, which reduces background effects. Problem areas for future research are discussed, giving attention to the theory of the heterodyne detection process, the detector, the local oscillator, and the optical components and system engineering. Observational prospects and motivation are also considered.
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