Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984opten..23..122l&link_type=abstract
Optical Engineering (ISSN 0091-3286), vol. 23, Mar.-Apr. 1984, p. 122-127. NASA-supported research.
Astronomy and Astrophysics
Astronomy
1
Cryogenic Equipment, Infrared Astronomy Satellite, Satellite-Borne Instruments, Spaceborne Telescopes, Block Diagrams, Design Analysis, Focal Plane Devices, Ionizing Radiation, Radiation Effects, Satellite Configurations, Sky Surveys (Astronomy)
Scientific paper
The Infrared Astronomical Satellite (IRAS) has completed an unbiased all-sky survey at wavelengths from 10 to 100 microns. 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 microns, the system noise equivalent flux density (NEFD) values are in Jy/(Square root of Hz), 0.03, 0.025, 0.046, and 0.21, respectively (Jansky = 10 to the -26th W/sq m/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 telescope permit total flux measurements of extended infrared emission at levels below 6,000,000 Jy/sr. Response of the extrinsic silicon and germanium photo-detectors to ionizing radiation is described.
Beichman Charles Arnold
Gillett Fred C.
Houck James R.
Langford D. E.
Low Frank J.
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