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Proceedings Paper

Active surface correction of metallic honeycomb sandwich mirrors
Author(s): Brent J. Backhaus; Steven E. Forman
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Paper Abstract

A common method for correcting wavefront aberrations in an optical system involves using an array of actuators to deform the optical surface of a mirror until the aberrations are reduced or eliminated. Recent interest in metallic sandwich mirrors, where the optical surface is separated from the back surface by a lightweighted core, has created the need for a method to correct wavefront aberrations other than by applying tuator forces. One possible way to deform the optical surface of a sandwich mirror is by ndependently pressurizing cells within the core of the mirror. A method of active correction utilizing independently ressithzed "mro-ce11s" in the core of an 18-inch di& aluminum honeycomb sandwich mirror has been attempted. This paper describes the experiments and the finite element analyses which were conducted on 6-inch mirror blanks containing progressively more complex single macro-cells; and the experiments condtxted on two 18-inch mirror blanks, one with a cellular honeycomb core and the other with a machined aluminum core, each containing 19 individual macro-cells. Results from the multiple macro-ceU mirror blanks show that establishing a spatially variable pressure distribution in the core of a sandwich mirror can be an effective active method for deforming the mirror's optical surface.

Paper Details

Date Published: 1 October 1990
PDF: 13 pages
Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); doi: 10.1117/12.21539
Show Author Affiliations
Brent J. Backhaus, Lincoln Lab./MIT (United States)
Steven E. Forman, Lincoln Lab./MIT (United States)

Published in SPIE Proceedings Vol. 1303:
Advances in Optical Structure Systems
John A. Breakwell; Victor L. Genberg; Gary C. Krumweide, Editor(s)

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