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Proceedings Paper

Optical evaluation of membrane mirrors with curvature
Author(s): Dan K. Marker; Richard A. Carreras; James Michael Wilkes; C. H. Jenkins; Dennis C. Duneman; James R. Rotge; Charles Barry Hogge
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Paper Abstract

Thin membranes with curvature are investigated as mirror substrates for use in large optical telescopes. These films are mounted on an optically flat circular ring and stretched over a smaller optically flat circular ring where pressure or vacuum is applied to create the doubly curved surface as shown in figure 1. The films may vary in thickness from 20 to 200 microns. This particular experiment examines an aluminum coated 125 micron thick homogeneous, planar, isotropic membrane with a clear aperture of 28 centimeters. The nature of a flexible membrane implies that the surface curvature will result in an assorted array of gross surface figure issues associated with deterministic shape limits, probabilistic imperfections, nonlinear constitutive effects, and long-time- dependent effects. This report will focus on the empirical deterministic shape limits of a doubly curved membrane. Theoretical work on thin films inflated or evacuated into a doubly curved surface has a long history, and remains an active area of research. A number of articles [1,2,3,4,7] include summaries of this history, and offer insight on the deterministic membrane shapes.

Paper Details

Date Published: 8 December 1998
PDF: 7 pages
Proc. SPIE 3430, Novel Optical Systems and Large-Aperture Imaging, (8 December 1998); doi: 10.1117/12.332489
Show Author Affiliations
Dan K. Marker, Air Force Research Lab. (United States)
Richard A. Carreras, Air Force Research Lab. (United States)
James Michael Wilkes, Air Force Research Lab. (United States)
C. H. Jenkins, Air Force Research Lab. (United States)
Dennis C. Duneman, Air Force Research Lab. (United States)
James R. Rotge, Boeing North American/Rocketdyne Technical Services (United States)
Charles Barry Hogge, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 3430:
Novel Optical Systems and Large-Aperture Imaging
Kevin Dean Bell; Michael K. Powers; Jose M. Sasian, Editor(s)

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