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Proceedings Paper

Air flow studies in channelled mirrors
Author(s): Lawrence D. Barr; John Fox; David M. Dryden; Gary A. Poczulp
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Paper Abstract

Air flow tests with a 61-cm diameter, 8.9-cm thick mirror have indicated that the circulation of ambient temperature air through the channels at 10 m/sec sufficed to maintain the mirror's front surface below the critical temperatures that would result in good mirror seeing; the effective front-surface thermal time constant for these conditions was 1 hr. An extrapolation of these results to mirrors of greater thickness, without channels, indicated that the use of a heat exchanger to control rear surface air temperature could be as effective as ambient air flow through internal channels, up to mirror thicknesses of about 10 cm.

Paper Details

Date Published: 1 July 1990
PDF: 13 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19246
Show Author Affiliations
Lawrence D. Barr, National Optical Astronomy Observatories (United States)
John Fox, National Optical Astronomy Observatories (United States)
David M. Dryden, National Optical Astronomy Observatories (United States)
Gary A. Poczulp, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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