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Optical Engineering

Cryogenic Telescope On The Infrared Astronomical Satellite (IRAS)
Author(s): F. J. Low; C A. Beichman; F. C. Gillett; J. R. Houck; G. Neugebauer; D. E. Langford; R. G. Walker; R. H. White
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Paper Abstract

The Infrared Astronomical Satellite (IRAS)* has completed an unbiased all-sky survey at wavelengths from 10 to 100 Am. The design and performance of the focal plane array is described with emphasis on in-orbit measurements of the sensitivity and stability. In the four broad spectral bands centered at 12, 25, 60, and 100 Am, the system noise equivalent flux density (NEFD) values are, in Jy/Hz1/2, 0.03, 0.025, 0.046, and 0.21, respectively (Jansky = 10-26 W/m2/Hz). For point sources, a single scan at the survey rate of 3.8 arcmin/s yields limiting flux densities at the 3-sigma confidence level of 0.36, 0.30, 0.39, and 1.2 Jy. The dc stability of the junction field effect transistor (JFET) amplifiers and the excellent off-axis rejection of the tele-scope permit total flux measurements of extended infrared emission at levels below 106 Jy/sr. Response of the extrinsic silicon and germanium photo-detectors to ionizing radiation is described.

Paper Details

Date Published: 1 April 1984
PDF: 6 pages
Opt. Eng. 23(2) 232122 doi: 10.1117/12.7973398
Published in: Optical Engineering Volume 23, Issue 2
Show Author Affiliations
F. J. Low, University of Arizona (United States)
C A. Beichman, California Institute of Technology (United States)
F. C. Gillett, Kitt Peak National Observatory (United States)
J. R. Houck, Cornell University (United States)
G. Neugebauer, California Institute of Technology (United States)
D. E. Langford, California Institute of Technoloav (United States)
R. G. Walker, Jamieson Science and Engineering, Inc. (United States)
R. H. White, California Institute of Technology (United States)

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