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Proceedings Paper

Subtleties In The Flat-Fielding Of Charge-Coupled Device (CCD) Images
Author(s): William A. Baum; Bjarne Thomsen; Tobias J. Kreidl
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Paper Abstract

Astronomical photometry with CCDs will often involve relatively low signal levels--less than 1000 charge carriers per pixel--at which non-linear effects sometimes become significant. These effects, which have already been troublesome to us in attempting accurate photometry of faint objects with ground-based telescopes, will doubtless play a role in the processing of Space Telescope data. The problem evidently arises because signal charges are not read out equally completely from all columns and all pixels. Although a first-order correction can be made by subtracting a low-level flat field from all frames before conventional processing, higher accuracy can be achieved by modeling the response with a non-linear function.

Paper Details

Date Published: 1 January 1981
PDF: 4 pages
Proc. SPIE 0290, Solid-State Imagers for Astronomy, (1 January 1981); doi: 10.1117/12.965832
Show Author Affiliations
William A. Baum, Lowell Observatory (United States)
Bjarne Thomsen, Lowell Observatory (United States)
Tobias J. Kreidl, Lowell Observatory (United States)


Published in SPIE Proceedings Vol. 0290:
Solid-State Imagers for Astronomy
John C. Geary; David W. Latham, Editor(s)

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