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Proceedings Paper

Absolute radiometry in space using a cryogenic mechanical cooler
Author(s): John E. Martin; Carl Thwaite
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Paper Abstract

An electrical substitution radiometer cooled to 20K is being developed to determine the total solar irradiance with a ten-fold improvement in terms of absolute accuracy and resolution over existing space-borne radiometers. The radiometer is cooled using a Matra Marconi Space mechanical cooler based on the Stirling cycle with a heat lift of 120 mW at 20K. The instrument weights 74 kg, requires 130 K of power and has an overall envelope size of 453 by 383 by 730 mm. The instrument has been part of the European accommodation study for external payloads on the International Space Station.

Paper Details

Date Published: 14 October 1996
PDF: 10 pages
Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); doi: 10.1117/12.254146
Show Author Affiliations
John E. Martin, National Physical Lab. (United Kingdom)
Carl Thwaite, AEA Technology (United Kingdom)

Published in SPIE Proceedings Vol. 2814:
Cryogenic Optical Systems and Instruments VII
Lawrence G. Burriesci; James B. Heaney, Editor(s)

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