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Proceedings Paper

Deformation analysis of a communication telescope structure under nonuniform heating using holographic interferometry
Author(s): Pierre M. Jacquot; Mathias Lehmann; Xavier Colonna de Lega
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Paper Abstract

The mechanical behavior of satellite telescope structures, subjected to non-uniform heating, as this occurs in orbit, is examined. In the laboratory, temperature gradients are created either by resistors or by IR lamps. Telescope structures are made of a material of very low thermal expansion coefficient--INVAR or carbon-carbon composite--in order to cope with stringent long term stability requirements in relation to temperature variation. Real time holographic interferometry is used to disclose the micro- deformation of the telescope. A careful implementation of the method is necessary, since, within the fixed temperature range for this study, very small deformations are expected. Monitoring of the heating conditions is achieved by an IR camera and thermocouples. Maps of temperature and of the corresponding interferometric out-of-plane deformation are obtained in parallel. The dynamic phase shifting technique allows to produce time-sequences of such deformation maps. These movies, and the temperature/deformation maps, highlight the structure deformation in a quantitative and dynamic way and suitably determine whether the structures meet their specifications.

Paper Details

Date Published: 18 March 1998
PDF: 12 pages
Proc. SPIE 3293, Practical Holography XII, (18 March 1998); doi: 10.1117/12.303643
Show Author Affiliations
Pierre M. Jacquot, Swiss Federal Institute of Technology (Switzerland)
Mathias Lehmann, Swiss Federal Institute of Technology (Switzerland)
Xavier Colonna de Lega, Swiss Federal Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3293:
Practical Holography XII
Stephen A. Benton, Editor(s)

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