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Proceedings Paper

Linear thermal expansion measurements of lead magnesium niobate (PMN) electroceramic material for the Terrestrial Planet Finder Coronagraph
Author(s): Paul B. Karlmann; Kerry J. Klein; Peter G. Halverson; Robert D. Peters; Marie B. Levine; David Van Buren; Matthew J. Dudik
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Paper Abstract

Linear thermal expansion measurements of nine samples of Lead Magnesium Niobate (PMN) electroceramic material were recently performed in support of NASA's Terrestrial Planet Finder Coronagraph (TPF-C) mission. The TPF-C mission is a visible light coronagraph designed to look at roughly 50 stars pre-selected as good candidates for possessing earth-like planets. Upon detection of an earth-like planet, TPF-C will analyze the visible-light signature of the planet's atmosphere for specific spectroscopic indicators that life may exist there. With this focus, the project's primary interest in PMN material is for use as a solid-state actuator for deformable mirrors or compensating optics. The nine test samples were machined from three distinct boules of PMN ceramic manufactured by Xinetics Inc. Thermal expansion measurements were performed in 2005 at NASA Jet Propulsion Laboratory (JPL) in their Cryogenic Dilatometer Facility. All measurements were performed in vacuum with sample temperature actively controlled over the range of 270K to 310K. Expansion and contraction of the test samples with temperature was measured using a JPL-developed interferometric system capable of sub-nanometer accuracy. Presented in this paper is a discussion of the sample configuration, test facilities, test method, data analysis, test results, and future plans.

Paper Details

Date Published: 18 August 2005
PDF: 10 pages
Proc. SPIE 5868, Optical Materials and Structures Technologies II, 58680M (18 August 2005); doi: 10.1117/12.615173
Show Author Affiliations
Paul B. Karlmann, Jet Propulsion Lab. (United States)
Kerry J. Klein, Jet Propulsion Lab. (United States)
Peter G. Halverson, Jet Propulsion Lab. (United States)
Robert D. Peters, Jet Propulsion Lab. (United States)
Marie B. Levine, Jet Propulsion Lab. (United States)
David Van Buren, Jet Propulsion Lab. (United States)
Matthew J. Dudik, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5868:
Optical Materials and Structures Technologies II
William A. Goodman, Editor(s)

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