Temperature control of the 3.5-meter WIYN telescope primary mirror

Details Temperature control of the 3.5-meter WIYN telescope primary mirror Temperature control of the 3.5-meter WIYN telescope primary mirror

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1532..161g&link_type=abstract

In: Analysis of optical structures; Proceedings of the Meeting, San Diego, CA, July 23, 24, 1991 (A93-38415 15-37), p. 161-169.

Computer Science

Performance

Cooling Systems, Mirrors, Telescopes, Temperature Control, Air Jets, Borosilicate Glass, Control Systems Design, Finite Element Method, Heat Exchangers, Liquid Cooling

Scientific paper

The WIYN telescope primary mirror is the 3.5-m, second mirror cast at the University of Arizona. The borosilicate glass temperature of the mirror is regulated during use to limit the distortions caused from thermal expansion, and to limit mirror seeing caused by natural convection. The thermal regulation system includes a closed air cooling plenum within the mirror cell structure with blowers and heat exchangers. Heat generated by this system and that from the glass is carried away by another liquid cooling loop to a remotely positioned liquid chilling unit. The system can regulate the mirror temperature to +/- 0.2 C from a temperature set point near ambient air for typical static and dynamic environments. Evaluation of the system includes a full laboratory optical test of the mirror, support, cell, and temperature control system. Data on the performance of the thermal control is summarized in terms of the quantities of temperature deltas across the system components and flows of air, water, and heat.

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