Infrared and visible detector electronics for the Infrared Astronomical Satellite (IRAS)

Details Infrared and visible detector electronics for the Infrared Astronomical Satellite (IRAS) Infrared and visible detector electronics for the Infrared Astronomical Satellite (IRAS)

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445..244l&link_type=abstract

IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be

Astronomy and Astrophysics

Astronomy

1

Cryogenic Cooling, Infrared Astronomy Satellite, Infrared Detectors, Radiation Detectors, Satellite-Borne Instruments, Spacecraft Electronic Equipment, Airborne/Spaceborne Computers, Digital Systems, Focal Plane Devices, Jfet, Microprocessors, Preamplifiers

Scientific paper

The paper describes the detectors, preamplifiers, and processing electronics; the system characterization test methods and results; and the performance of the detectors and electronics during the first month of on-orbit operation of the IRAS telescope. The Focal Plane Array (FPA) consists of 62 IR channels and 8 visible channels operating at 2.5 K. The IR detectors are grouped in eight 7 or 8 channel staggered linear subarrays with shared bias voltage; the visible detectors are grouped in two 4 channel skewed arrays, also with shared bias. Each channel detector is dc coupled to a TIA preamplifier through a very low power thermally isolated JFET source follower operating at about 65 K within the FPA housing. The visible channel detectors are ac coupled to TIA preamplifiers and signal chain electronics using MOSFET source followers operating at about 2.5 K within the FPA housing. The detectors, preamplifiers, analog electronics, and grounding are discussed as they evolved and were implemented during FPA retrofit, telescope integration, and preparation for launch.

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