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Shape correction of thin mirrors in a reconfigurable modular space telescope

Patterson, Keith and Pellegrino, Sergio and Breckinridge, James (2010) Shape correction of thin mirrors in a reconfigurable modular space telescope. In: Space telescopes and instrumentation 2010 : optical, infrared, and millimeter wave. Proceedings of SPIE. No.7731. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 773121. ISBN 978-0-81948-221-1.

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In order to facilitate the construction of future large space telescopes, the development of low cost, low mass mirrors is necessary. However, such mirrors suffer from a lack of structural stability, stiffness, and shape accuracy. Active materials and actuators can be used to alleviate this deficiency. For observations in the visible wavelengths, the mirror surface must be controlled to an accuracy on the order of tens of nanometers. This paper presents an exploration of several mirror design concepts and compares their effectiveness at providing accurate shape control. The comparison test is the adjustment of a generic mirror from its manufactured spherical shape to the shape required by various off-axis mirrors in a segmented primary mirror array. A study of thermal effects is also presented and, from these results, a recommended design is chosen.

Item Type:Book Section
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URLURL TypeDescription
Pellegrino, Sergio0000-0001-9373-3278
Breckinridge, James0000-0002-9488-098X
Additional Information:© 2010 SPIE. This research was sponsored by the Keck Institute for Space Studies (KISS). We would like to thank Dr Mark Lake and Dr Matt Mountain for stimulating comments during the initial formulation of the concepts presented in this paper. Professor Chiara Daraio and Dr Abha Misra have kindly allowed us to present some early results from their research on low CTE, bimetallic mirror films. The nanosatellite mission proposed in Section 4 is a collaboration between Caltech and the University of Surrey. We acknowledge the contribution of Dr Craig Underwood (University of Surrey, UK) to the formulation of this mission concept.
Group:Keck Institute for Space Studies, GALCIT
Funding AgencyGrant Number
Keck Institute for Space Studies (KISS)UNSPECIFIED
Subject Keywords:thin mirrors; segmented telescopes; shape correction; image quality
Series Name:Proceedings of SPIE
Issue or Number:7731
Record Number:CaltechAUTHORS:20110321-085232350
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Official Citation:Keith Patterson ; Sergio Pellegrino and James Breckinridge "Shape correction of thin mirrors in a recongurable modular space telescope", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773121 (August 10, 2010); doi:10.1117/12.861442;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22999
Deposited By: Tony Diaz
Deposited On:21 Mar 2011 20:57
Last Modified:09 Nov 2021 16:10

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