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Proceedings Paper

Deformation measurements by ESPI of the surface of a heated mirror and comparison with numerical model
Author(s): Fabian Languy; Jean-François Vandenrijt; Philippe Saint-Georges; Marc P. Georges
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Paper Abstract

The manufacture of mirrors for space application is expensive and the requirements on the optical performance increase over years. To achieve higher performance, larger mirrors are manufactured but the larger the mirror the higher the sensitivity to temperature variation and therefore the higher the degradation of optical performances. To avoid the use of an expensive thermal regulation, we need to develop tools able to predict how optics behaves with thermal constraints. This paper presents the comparison between experimental surface mirror deformation and theoretical results from a multiphysics model. The local displacements of the mirror surface have been measured with the use of electronic speckle pattern interferometry (ESPI) and the deformation itself has been calculated by subtracting the rigid body motion. After validation of the mechanical model, experimental and numerical wave front errors are compared.

Paper Details

Date Published: 26 June 2017
PDF: 12 pages
Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103291M (26 June 2017); doi: 10.1117/12.2270258
Show Author Affiliations
Fabian Languy, Ctr. Spatial de Liège (Belgium)
Jean-François Vandenrijt, Ctr. Spatial de Liège (Belgium)
Philippe Saint-Georges, Open Engineering S.A. (Belgium)
Marc P. Georges, Ctr. Spatial de Liège (Belgium)

Published in SPIE Proceedings Vol. 10329:
Optical Measurement Systems for Industrial Inspection X
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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