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Proceedings Paper

Gravity Deflections Of Lightweighted Mirrors
Author(s): D. Anderson; R. E. Parks; Q. M. Hansen; R. Melugin
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Paper Abstract

Two 20-in, diameter, f/4 fused silica mirrors were lightweighted by contouring the rear sides to near parabolic cross sections. One mirror was lightweighted into a single-arch, thick-hub design. The other mirror took the form of a cantilevered double arch. Details of the fabrication are outlined. Following fabrication, these mirrors were interferometrically tested at their centers of curvature in both a face-up and face-down support mode. By subtracting the wavefront errors in these two support modes, the gravity deflections were determined in spite of some residual figure error. Details of the data analysis and the resulting gravity-induced deflections are reported. These empirical results are compared with finite element analyses with favorable results.

Paper Details

Date Published: 4 November 1982
PDF: 12 pages
Proc. SPIE 0332, Advanced Technology Optical Telescopes I, (4 November 1982); doi: 10.1117/12.933550
Show Author Affiliations
D. Anderson, University of Arizona (United States)
R. E. Parks, University of Arizona (United States)
Q. M. Hansen, NASA/Ames Research Center (United States)
R. Melugin, NASA/Ames Research Center (United States)

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

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