Mathematics – Logic
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117...46p&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 46-52.
Mathematics
Logic
9
Infrared Radiation, Noise Spectra, Radiant Flux Density, Signal Processing, Sky Radiation, Telescopes, Atmospheric Effects, Demodulation, Meteorological Parameters, Noise Reduction, Photons, Sky Brightness, Space Observations (From Earth)
Scientific paper
The available observations of sky fluctuations have been used to define their spectrum and space correlation properties. Using these, it was possible to follow the noise content throughout the different stages of IR signal processing, and thus determine the detection sensitivity and its dependence on the system parameters. It was found that the ultimate sensitivity is set by the photon noise component, a limit which, with the current nodding technique, can only be reached under very stringent mechanical, optical and meteorological conditions. It is shown that, when these conditions are not perfectly matched, the actual sensitivity can be improved if the nodding rate is increased or if an array of several detectors is used. The gain is most significant in the mid-infrared and can be traded against a much larger gain in observation time.
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