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Proceedings Paper

Development and testing of an actively controlled large-aperture Cassegrain Telescope for spacecraft deployment
Author(s): Bradley G. Boone; Jonathan R. Bruzzi; Bernard E. Kluga; Eric W. Rogala; R. D. Hale; Peter C. Chen
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Paper Abstract

The National Aeronautics and Space Administration (NASA) is planning future deep space missions requiring space-based imaging reconnaissance of planets and recovery of imagery from these missions via optical communications. Both applications have similar requirements that can be met by a common aperture. The Johns Hopkins University Applied Physics Laboratory in collaboration with commercial and academic partners is developing a new approach to deploying and controlling large aperture (meter-class) optical telescopes on spacecraft that can be rapidly launched and deployed. The deployment mechanism uses flexible longeron struts to deploy the secondary. The active control system uses a fiber-coupled laser array near the focal plane that reflects four collimated laser beams off of the periphery of the secondary to four equally-disposed quad cell sensors at the periphery of the primary to correct secondary-to-primary misalignments and enable motion compensation. We describe a compensation technique that uses tip/tilt and piston actuators for quasi-static bias correction and dynamic motion compensation. We also describe preliminary optical tests using a commercial Schmidt-Cassegrain telescope in lieu of an ultra-lightweight composite Cassegrain, which is under development by Composite Mirror Applications, Inc. Finite element and ray trace modeling results for a 40 cm composite telescope design will also be described.

Paper Details

Date Published: 12 October 2004
PDF: 12 pages
Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); doi: 10.1117/12.552240
Show Author Affiliations
Bradley G. Boone, Johns Hopkins Univ. (United States)
Jonathan R. Bruzzi, Johns Hopkins Univ. (United States)
Bernard E. Kluga, Johns Hopkins Univ. (United States)
Eric W. Rogala, Johns Hopkins Univ. (United States)
R. D. Hale, Univ. of Kansas (United States)
Peter C. Chen, Catholic Univ. of America (United States)
NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5487:
Optical, Infrared, and Millimeter Space Telescopes
John C. Mather, Editor(s)

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