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Proceedings Paper

SIRTF On-Orbit Thermal Bending Analysis
Author(s): Li S Chang; Joseph A Mansfield
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Paper Abstract

The Space Infrared Telescope Facility (SIRTF) comprises a telescope system and a spacecraft. Both of these structures will experience temperature distribution changes due to variations in the sun/earth thermal radiation exposure while on-orbit. The more significant temperature changes (e.g., greater than 5K) and structural distortions occur principally in the outer shell of the telescope system. The telescope's internal optical and instrument components are structurally linked to the outer shell, and will experience some misalignment (decenter, defocus, and tilting) even though the telescope system structure is designed to minimize this effect. Misalignment magnitudes have been evaluated using a finite element structural model of the telescope system. The predicted misalignment results are presented for a telescope optical pointing sensor that may be either internally mounted to the instrument or externally mounted to the outer shell. It is shown that the primary and secondary mirror misalignments due to the thermally induced load of the chosen orbital scenario do not vary significantly. This paper is the first progress report on the topic for SIRTF. Additional orbital scenarios and other environmental assumptions are to be investigated later.

Paper Details

Date Published: 27 April 1988
PDF: 7 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948330
Show Author Affiliations
Li S Chang, Sterling Software (United States)
Joseph A Mansfield, NASA Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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