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Proceedings Paper

Photometric linearization of the NICMOS-3 array
Author(s): Christian B. Luginbuhl; Arne A. Henden; Frederick J. Vrba; Harry H. Guetter
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Paper Abstract

The inherent non-linearity in the photometric response of NICMOS-3 HgCdTe arrays can lead to photometric calibration errors of 1-2 percent or more when using standard flattening and calibration techniques involving single flat-field exposures and mid-level exposures of standard sources for calibration. Furthermore, the useful dynamic range of the device must be restricted to achieve even this precision, since deviations from linearity are greatest at higher exposure levels. We describe a technique to digitally linearize NICMOS-3 images by interpolating within the characteristic response curve for each pixel as determined from a series of exposures of a flat screen. Using astronomical observations, we quantify the improvements that can be achieved in final photometric precision and useful dynamic range.

Paper Details

Date Published: 21 August 1998
PDF: 7 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317305
Show Author Affiliations
Christian B. Luginbuhl, U.S. Naval Observatory (United States)
Arne A. Henden, U.S. Naval Observatory and Universities' Space Research Association (United States)
Frederick J. Vrba, U.S. Naval Observatory (United States)
Harry H. Guetter, U.S. Naval Observatory (United States)

Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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