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Proceedings Paper

Structural Analysis Of The Mirror Of The University Of Texas 7.6 M Telescope
Author(s): Frank B. Ray; Anthony Perroni
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Paper Abstract

A finite element model using an assemblage of plate elements with membrane stress for a 7.6 meter diameter meniscus mirror was extensively explored, for aspect ratios in the range of 50 to 75, and for various materials. Analyses of the support forces necessary for the meniscus shape and a possible design of the mirror cell revealed the necessity of laterally suspending the mirror from a set of points in its midsurface. A map of the heat distribution through the thickness of the meniscus for a typical ambient temperature change and an assumed air conditioning capacity is presented, derived from the solution of a one-dimensional thermal analysis. An equivalent thermal gradient is derived. A thermal edge effect was found, mostly due to the extreme aspect ratios involved, both for fused silica and for pyrex. Edge control becomes particularly necessary with a higher expansion coefficient, and the analysis shows to what extent.

Paper Details

Date Published: 4 November 1982
PDF: 6 pages
Proc. SPIE 0332, Advanced Technology Optical Telescopes I, (4 November 1982); doi: 10.1117/12.933522
Show Author Affiliations
Frank B. Ray, The University of Texas (United States)
Anthony Perroni, The University of Texas (United States)

Published in SPIE Proceedings Vol. 0332:
Advanced Technology Optical Telescopes I
Lawrence D. Barr; Geoffrey Burbidge, Editor(s)

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