Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apopt..15..427a&link_type=abstract
Applied Optics, vol. 15, Feb. 1976, p. 427-436.
Astronomy and Astrophysics
Astronomy
18
Astronomical Spectroscopy, Infrared Spectrometers, Optical Heterodyning, Photosensitivity, Infrared Astronomy, Line Spectra, Photodiodes, Signal Mixing, Signal To Noise Ratios
Scientific paper
A discussion and an evaluation of the degradation in sensitivity are given for a heterodyne spectrometer employing a HgCdTe photodiode mixer and tunable diode lasers. The minimum detectable source brightness is considered as a function of the mixer parameters, transmission coefficient of the beam splitter, and local oscillator emission powers. The degradation in the minimum detectable line source brightness that results from the bandwidth being a fraction of the line width is evaluated and plotted as a function of the wavelength and bandwidth for various temperature to mass ratios. It is shown that the minimum achievable degradation in the sensitivity of a practical astronomical heterodyne spectrometer is about 30. Estimates of SNRs with which IR line emission from astronomical sources of interest may be detected are given.
Abbas Merza
Buhl David
Kostiuk Theodor,
Mumma Michael J.
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