Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..844l&link_type=abstract
IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89
Other
1
Borosilicate Glass, Honeycomb Structures, Mirrors, Polishing, Temperature Control, Temperature Measurement, Interferometry, Random Noise, Surface Distortion, Ventilation
Scientific paper
The Steward Observatory Mirror Laboratory has implemented a large borosilicate honeycomb telescope mirror polishing system in which thermal distortion is reduced to negligible levels by maintaining the glass in an isothermal state to within 0.1 C. Testing of the polished surface is conducted in air, using a laser and interferometer mounted above the mirror; the control of refractive index variation in the laser's light-path entails that the air also be isothermal, to within 0.2 C. Thermocouples are used as sensors in the polishing room, in air ducts, and on the mirror. Measurements are made to an accuracy of 0.005 C at the rate of one thermocouple/sec.
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