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Proceedings Paper

Miniature High Stability High Temperature Space Rated Blackbody Radiance Source
Author(s): J. A. Jones; A. G. Beswick
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Paper Abstract

This paper presents the design and test performance of a conical cavity type blackbody radiance source that will meet the requirements of the Halogen Occultation Experiment (HALOE) on the NASA Upper Atmospheric Research Satellite program (UARS). Since a radiance source meeting the requirements of this experiment was unavailable in the commercial market, a development effort was undertaken by the HALOE Project. The blackbody radiance source operates in vacuum at 1300 K + 0.5 K over any 15-minute interval, uses less than 7.5 watts of power, maintains a 49°C outer case temperature, and fits within the 2.5 x 2.5 x 3.0 inch envelope allocated inside the HALOE instrument. Also, the unit operates in air, during ground testing of the HALOE instrument, where it uses 17 watts of power with an outer case temperature of 66°C. The thrust of this design effort was to minimize the heat losses, in order to keep the power usage under 7.5 watts, and to minimize the amount of silica in the materials. Silica in the presence of the platinum heater winding used in this design would cause the platinum to erode, changing the operating temperature set-point. The design required the development of fabrication techniques which would provide very small, close tolerance parts from extremely difficult-to-machine materials. Also, a space rated ceramic core and unique, low thermal conductance, ceramic-to-metal joint was developed, tested and incorporated in this design. The completed flight qualification hardware has undergone performance, environmental and life testing. The design configuration and test results are discussed in detail in this paper.

Paper Details

Date Published: 20 September 1987
PDF: 8 pages
Proc. SPIE 0750, Infrared Systems and Components, (20 September 1987); doi: 10.1117/12.939852
Show Author Affiliations
J. A. Jones, NASA Langley Research Center (United States)
A. G. Beswick, NASA Langley Research Center (United States)

Published in SPIE Proceedings Vol. 0750:
Infrared Systems and Components
Robert L. Caswell, Editor(s)

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