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This suite of 5 infrared detector elements is a small representative sample of the ones utilized in the focal plane assembly of the Infrared Astronomical Satellite (IRAS). They consist of photoconductive materials that change in electrical resistance in response to infrared radiation. They were variously constructed from silicon arsenide, antimonide and germanium gadolinium. A total of 62 detectors were mounted at the telescope's focal plane in an assembly that also included such accessories as field lenses and filters that further narrowed the response range. The entire array was cooled to 2.8 degrees K (-269.2 degrees Centigrade) by superfluid liquid helium in order to maximize sensitivity.

Rockwell International built the focal plane assembly and transferred it to the Jet Propulsion Laboratory in 1981 at which time it was integrated into IRAS. This set of elements was transferred to NASM by JPL in 1995.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type INSTRUMENTS-Scientific Manufacturer Rockwell International Corporation
 Dimensions Cases are 2.5cm (1 in.) square
 Materials Mixed metals, infrared sensitive
 Inventory Number A19950095000 Credit Line Gift of the Jet Propulsion Laboratory. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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