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Proceedings Paper

On-board calibration monitor for tracking instrument sensitivity
Author(s): J. W. Kruk; M. E. Kaiser; S. R. McCandliss; J. Orndorff; R. H. Barkhouser; D. J. Sahnow; D. J. Benford; R. C. Bohlin; S. E. Deustua; W. V. Dixon; P. D. Feldman; J. P. Gardner; R. A. Kimble; R. Kurucz; M. Lampton; H. W. Moos; S. Perlmutter; B. J. Rauscher; A. G. Riess; B. E. Woodgate; E. L. Wright
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Paper Abstract

The On-board Calibration Monitor (OCM) is being developed as an integral component of the ACCESS instrument and as a pathfinder for other missions. It provides stable full-aperture illumination of the telescope for tracking the instrument sensitivity as a function of time. The light source is composed of an ensemble of LED pairs with central wavelengths that span the spectral range of the instrument and illuminate a diffuser that is observed by the full optical path. Feedback stabilization of the light source intensity is achieved by photodiode monitoring of each LED. This stable source will provide real time knowledge of the ACCESS sensitivity throughout the 5-year duration of the program. The present status of the design and laboratory evaluation of the OCM system will be presented.

Paper Details

Date Published: 11 July 2008
PDF: 8 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70145J (11 July 2008); doi: 10.1117/12.790200
Show Author Affiliations
J. W. Kruk, Johns Hopkins Univ. (United States)
M. E. Kaiser, Johns Hopkins Univ. (United States)
S. R. McCandliss, Johns Hopkins Univ. (United States)
J. Orndorff, Johns Hopkins Univ. (United States)
R. H. Barkhouser, Johns Hopkins Univ. (United States)
D. J. Sahnow, Johns Hopkins Univ. (United States)
D. J. Benford, NASA Goddard Space Flight Ctr. (United States)
R. C. Bohlin, Space Telescope Science Institute (United States)
S. E. Deustua, Space Telescope Science Institute (United States)
W. V. Dixon, Johns Hopkins Univ. (United States)
P. D. Feldman, Johns Hopkins Univ. (United States)
J. P. Gardner, NASA Goddard Space Flight Ctr. (United States)
R. A. Kimble, NASA Goddard Space Flight Ctr. (United States)
R. Kurucz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
M. Lampton, Space Sciences Lab., Univ. of California, Berkeley (United States)
H. W. Moos, Johns Hopkins Univ. (United States)
S. Perlmutter, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
B. J. Rauscher, NASA Goddard Space Flight Ctr. (United States)
A. G. Riess, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)
B. E. Woodgate, NASA Goddard Space Flight Ctr. (United States)
E. L. Wright, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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