Air flow studies in channelled mirrors

Lawrence D. Barr; John Fox; David M. Dryden; Gary A. Poczulp

doi:10.1117/12.19246

1 July 1990 Air flow studies in channelled mirrors

Lawrence D. Barr, John Fox, David M. Dryden, Gary A. Poczulp

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19246
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

Citation Download Citation

Lawrence D. Barr, John Fox, David M. Dryden, and Gary A. Poczulp "Air flow studies in channelled mirrors", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19246

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available