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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
17.3.
Detection Limits and Signal-to-Noise Ratio 435
to both dark counts and read noise, the SNR for the detector-limited case can be
written as
SNR = SQt/y/Ct-i-R^, (17.2.6)
where C is the dark count per second and R is the rms read noise. If read noise is
negligible compared to dark count, the addition of k separate short exposures
leads to the result given in Eq. (17.2.5). If 7? is dominant, however, then the SNR
for k added exposures is smaller than that of a single long exposure by a factor of
Vk.
This treatment is sufficient to illustrate how system performance is specified in
terms of SNR. We now use this parameter to give a more detaile ...
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Publisher Resources

ISBN: 9780126298109