SIRTF On-Orbit Thermal Bending Analysis

Li S Chang; Joseph A Mansfield

doi:10.1117/12.948330

27 April 1988 SIRTF On-Orbit Thermal Bending Analysis

Li S Chang, Joseph A Mansfield

Proceedings Volume 0973, Cryogenic Optical Systems and Instruments III; (1988) https://doi.org/10.1117/12.948330
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

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.

Citation Download Citation

Li S Chang and Joseph A Mansfield "SIRTF On-Orbit Thermal Bending Analysis", Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); https://doi.org/10.1117/12.948330

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