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Proceedings Paper

Infrared And Visible Detector Electronics For The Infrared Astronomical Satellite (IRAS)
Author(s): D. L. Langford; J. J. Simmonds; T. Ozawa; E. C. Long; R. Paris
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Paper Abstract

The Infrared Astronomical Satellite (IRAS) launched in January of 1983 utilizes a super-fluid helium cooled IR telescope and detector Focal Plane Array (FPA) to perform an all-sky survey in four wavelength bands from 8 to 118 micrometers. Temperatures at which different portions of the electronics must operate range from 2.5 to 280 K. The FPA consists of 62 infrared channels and 8 visible channels operating at 2.5 K. The IR detectors are grouped in eight 7 or 8 channel staggered linear suharrays with shared bias voltage; the visible detectors are grouped in two 4 channel skewed arrays, also with shared bias. Each IR channel detector is DC coupled to a TIA preamplifier through a very low power thermally isolated JFET source follower operating at approximately 65 K within the FPA housing. The TIA preamplifiers and bias supplies are located outside the telescope dewar and operate at approximately 280 K. The signal outputs from the preamplifiers are further processed by additional DC coupled gain amplifiers, filters and multiplexers prior to being digitized by a 16 bit analog to digital converter. The visible channel detectors are AC coupled to TIA preamplifiers and signal chain electronics using MOSFET source followers operating at approximately 2.5K within the FPA housing. This paper describes the detectors, preamplifiers and processing electronics, the system characterization test methods and results, and finally the performance of the detectors and electronics during the first month of on-orbit operation of the IRAS telescope.

Paper Details

Date Published: 9 January 1984
PDF: 10 pages
Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); doi: 10.1117/12.966154
Show Author Affiliations
D. L. Langford, Jet Propulsion Laboratory (United States)
J. J. Simmonds, Jet Propulsion Laboratory (United States)
T. Ozawa, Jet Propulsion Laboratory (United States)
E. C. Long, Ball Aerospace Systems Division (United States)
R. Paris, Ball Aerospace Systems Division (United States)

Published in SPIE Proceedings Vol. 0445:
Instrumentation in Astronomy V
Alec Boksenberg; David L. Crawford, Editor(s)

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