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Proceedings Paper

Holographic Testing Of Stretchable Concave Imaging Mirrors
Author(s): W. King; P. Waddell; T. Raptodimos
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Paper Abstract

A circular, concave, imaging mirror of variable focus is described. The mirror is a very thin plastic membrane with a highly reflective metallised front surface. Mirror curvature is determined by the strength of a vacuum applied to the rear face of the film, increasing the vacuum will increase the curvature. High resolution reflected and focussed images have been observed from targets, using both white light and infra-red. Mirror curvatures from f/10 to f/0.4 have been examined, high resolution images were obtained at all curvatures. Such a wide range covers large f number astronomical telescopes, to the 'fast' small f number concave mirrors used in infra-red imaging. The contents of this paper will describe the application of holographic testing to such devices. The tests were undertaken in order to examine the symmetry of the mirror surface and to study the vibratory response of that surface.

Paper Details

Date Published: 16 July 1986
PDF: 8 pages
Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); doi: 10.1117/12.952357
Show Author Affiliations
W. King, University of Strathclyde (Scotland)
P. Waddell, University of Strathclyde (Scotland)
T. Raptodimos, University of Strathclyde (Scotland)


Published in SPIE Proceedings Vol. 0599:
Optics in Engineering Measurement
William F. Fagan, Editor(s)

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