Computer Science – Performance
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1693..281a&link_type=abstract
In: Surveillance technologies II; Proceedings of the Meeting, Orlando, FL, Apr. 21-23, 1992 (A93-29980 11-19), p. 281-295.
Computer Science
Performance
Mirrors, Silicon Carbides, Spaceborne Telescopes, Ultraviolet Telescopes, Cryogenic Temperature, Goes Satellites, Reflecting Telescopes, Visible Spectrum, Weight Reduction
Scientific paper
A SiC based telescope is an extremely attractive emerging technology which offers the lightweight and stiffness features of beryllium, the optical performance of glass to diffraction limited visible resolution, superior optical/thermal stability to cryogenic temperatures, and the cost advantages of an aluminum telescope. SSG has developed various SiC mirrors with and without a silicon coating and tested these mirrors over temperature ranges from +50 C to -250 C. Our test results show less than 0.2 waves P-V in visible wavefront change and no hysteresis over this wide temperature range. Several SSG mirrors are representative of very lightweight SiC/Si mirrors including (1) a 9 cm diameter, high aspect ratio mirror weighing less than 30 grams and (2) a 23 cm diameter eggcrated mirror weighing less than 400 grams. SSG has also designed and analyzed a 0.6 meter SiC based, on axis, three mirror reimaging telescope in which the primary mirror weighs less than 6 kg and a 0.5 meter GOES-like scan mirror. SSG has also diamond turned several general aspheric SiC/Si mirrors with excellent cryo optical performance.
Anapol Michael I.
Hadfield Peter
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