Absolute radiometry in space using a cryogenic mechanical cooler

John E. Martin; Carl Thwaite

doi:10.1117/12.254146

14 October 1996 Absolute radiometry in space using a cryogenic mechanical cooler

John E. Martin, Carl Thwaite

Proceedings Volume 2814, Cryogenic Optical Systems and Instruments VII; (1996) https://doi.org/10.1117/12.254146
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

John E. Martin and Carl Thwaite "Absolute radiometry in space using a cryogenic mechanical cooler", Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); https://doi.org/10.1117/12.254146

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