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Proceedings Paper

Hinged substrate for large-aperture lightweight deformable mirrors: a novel concept
Author(s): Sarma N. Gullapalli; Thomas Joseph Duffy; Carl D. Crane III; Neil L. White; Harvey Lipkin
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Paper Abstract

A novel concept for large aperture lightweight deformable mirrors is presented. This new concept is based on using a flexure-hinged truss substrate as opposed to monolithic substrates used in all past and current deformable mirror technologies. With its ability to deform in tangential as well as normal directions, this new concept solves the problem of coefficient of thermal expansion (CTE) mismatch between face sheet and substrate. It takes advantage of the newly emerging face sheet technologies such as nanolaminates that produce extremely lightweight optical quality face sheets and require very small forces to deform them. It also provides rigidity to the thin face sheet mirror, necessary for the uniqueness of response to actuator commands and for tolerance to disturbances. Any stresses in substrate structure are mainly limited to those induced by the forces in the face sheet itself, which are small in the new lightweight face sheets. The dynamic range of deformation is limited only by the actuator stroke, and not by the stresses induced in the substrate. Therefore it drives the actuator design to small force large stroke actuators, as opposed to the current designs that use large force small stroke moment actuators.

Paper Details

Date Published: 18 December 2002
PDF: 16 pages
Proc. SPIE 4849, Highly Innovative Space Telescope Concepts, (18 December 2002); doi: 10.1117/12.460773
Show Author Affiliations
Sarma N. Gullapalli, Veridian Systems (United States)
Thomas Joseph Duffy, Univ. of Florida (United States)
Carl D. Crane III, Univ. of Florida (United States)
Neil L. White, Univ. of Florida (United States)
Harvey Lipkin, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4849:
Highly Innovative Space Telescope Concepts
Howard A. MacEwen, Editor(s)

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