Statistics – Applications
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....36..341v&link_type=abstract
Astronomy and Astrophysics, vol. 36, no. 3, Dec. 1974, p. 341-348. Research supported by the Nederlandse Organisatie voor Zuive
Statistics
Applications
6
Infrared Astronomy, Infrared Detectors, Laser Applications, Optical Heterodyning, Signal To Noise Ratios, Solar Instruments, Black Body Radiation, Helium-Neon Lasers, Infrared Lasers, Noise Reduction, Signal Detection
Scientific paper
The theory, construction and performance of a heterodyne detector working at a wavelength of 3.39 microns are described. To obtain an optimum SNR with a moderate amount of laser power, the use of a balanced detection system is very effective while it provides at the same time the additional advantage of eliminating local oscillator noise. A balanced detection system was built with commercially available components and an experimental verification of its properties was carried out in the laboratory, using a calibrated blackbody radiator. Measurements of the sun were carried out with the aid of a solar telescope and the resulting SNR is compared with the theoretical predictions. Applications to other astronomical objects are discussed.
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