Fused Silica Mirror Evaluation For The Shuttle Infrared Telescope Facility (SIRTF)

William P. Barnes Jr.; Ramsey K. Melugin

doi:10.1117/12.934188

16 August 1983 Fused Silica Mirror Evaluation For The Shuttle Infrared Telescope Facility (SIRTF)

William P. Barnes Jr., Ramsey K. Melugin

Proceedings Volume 0364, Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II; (1983) https://doi.org/10.1117/12.934188
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

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.

Citation Download Citation

William P. Barnes Jr. and Ramsey K. Melugin "Fused Silica Mirror Evaluation For The Shuttle Infrared Telescope Facility (SIRTF)", Proc. SPIE 0364, Technologies of Cryogenically Cooled Sensors and Fourier Transform Spectrometers II, (16 August 1983); https://doi.org/10.1117/12.934188

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