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Proceedings Paper

Fused Silica Mirror Evaluation For The Shuttle Infrared Telescope Facility (SIRTF)
Author(s): William P. Barnes Jr.; Ramsey K. Melugin
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Paper Abstract

The SIRTF optics are intended for operation at 20°K (or less); it will be extremely inconvenient, expensive, and time consuming if it becomes necessary to accomplish all of the optical element testing, assembly, and alignment at comparable temperatures. The thermal strain behavior, including potential anisotropies and inhomogeneities, of a mirror substrate between room temperature and 20°K thus becomes a major factor in the selection of the substrate material, structural configuration, and joining methods for lightweight structures. With support from Space Projects, NASA Ames Research Center, Itek Optical Systems is executing an optical figure evaluation of a 0.65-meter, lightweight, fused silica mirror at a low-temperature goal of 20°K. The design details of a thermal shroud, provisions for extracting heat from the low-conductivity mirror, and wavefront error sources other than the mirror surface are discussed and preliminary test results presented.

Paper Details

Date Published: 16 August 1983
PDF: 13 pages
Proc. SPIE 0364, Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II, (16 August 1983); doi: 10.1117/12.934188
Show Author Affiliations
William P. Barnes Jr., Itek Corporation (United States)
Ramsey K. Melugin, National Aeronautics and Space Administration Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0364:
Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II
Ronald J. Huppi, Editor(s)

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