Computer Science – Performance
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2266..122c&link_type=abstract
Proc. SPIE Vol. 2266, p. 122-132, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, Jinxu
Computer Science
Performance
1
Scientific paper
This paper describes Fabry-Perot/CCD annular summing applied to airglow observations. Criteria are developed for determining the optimal rectangular format CCD chip configuration which minimizes dark and read noise. The relative savings in integration time of the imaging Fabry-Perot/CCD system over the pressure-scanned Fabry-Perot/PMT system is estimated for the optimal configuration through calculations of the signal to noise ratios for three extreme (but typical) cases of source and background intensity. The largest savings in integration time is estimated for the daysky thermospheric [O(superscript 1)D] (6300 angstrom) case where the bright (approximately equals 5 X 10(superscript 6)R/A) Rayleigh-scattered background dominates the read noise. The long integration times required to obtain useful signal to noise ratios for the faint (approximately equals 10R) nightsky exospheric hydrogen Balmer-(alpha) (6563 angstrom) reduce the importance of the read noise term and yield large savings in integration time. The significance of the read noise term is greatly increased with the very short estimated integration times required for bright (approximately equals 200R) nightsky lines such as thermospheric [O(superscript 1)D]. Alternate CCD formats and applications methods that reduce read noise and provide improved performance in the latter case are compared against the CCD annular summing technique.
Coakley Monica M.
Roesler Fred L.
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