Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628..536c&link_type=abstract
IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin
Astronomy and Astrophysics
Astronomy
Borosilicate Glass, Honeycomb Structures, Mirrors, Reflecting Telescopes, Temperature Control, Thermal Degradation, Air Flow, Cooling, Heat Exchangers, Thermal Conductivity
Scientific paper
A full scale glass thermal model of one honeycomb cell of an 8 m mirror was built, along with a system to flow in air at controlled temperature. The authors find that the air jets realize high thermal coupling efficiency, and allow good control of internal gradients. With the air cooling steadily at 0.25°C/hour, typical of nighttime cooling at good sites, internal gradients were <0.1°C and the overall lag between air and glass temperature was 0.25°C. This performance, achieved with a flow rate of 6 - 10 liters/sec per cell, will ensure negligible image degradation from convection at the mirror surface (mirror seeing) or from thermal distortion of the mirror substrate.
Angel James Roger P.
Cheng Andrew Y. S.
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