Deformation measurements by ESPI of the surface of a heated mirror and comparison with numerical model

Fabian Languy; Jean-François Vandenrijt; Philippe Saint-Georges; Marc P. Georges

doi:10.1117/12.2270258

26 June 2017 Deformation measurements by ESPI of the surface of a heated mirror and comparison with numerical model

Fabian Languy, Jean-François Vandenrijt, Philippe Saint-Georges, Marc P. Georges

Proceedings Volume 10329, Optical Measurement Systems for Industrial Inspection X; 103291M (2017) https://doi.org/10.1117/12.2270258
Event: SPIE Optical Metrology, 2017, Munich, Germany

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.

Citation Download Citation

Fabian Languy, Jean-François Vandenrijt, Philippe Saint-Georges, and Marc P. Georges "Deformation measurements by ESPI of the surface of a heated mirror and comparison with numerical model", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103291M (26 June 2017); https://doi.org/10.1117/12.2270258

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