Paper published in a journal (Scientific congresses and symposiums)
Mechanical deformations of space mirrors under thermal stress and their effect on wavefront errors: measurements by ESPI and comparison with multiphysics modeling
Finite element methods; Interferometry; Mirrors; Optical components; Phase measurement; Space mirrors; Wavefronts; Zemax
Abstract :
[en] Numerical modeling tools are widely used in space science, but are usually limited to the thermomechanical steps. However, many payloads are equipped with high performance optical systems with tight tolerances. Therefore, experimental testing of space optics in very realistic conditions is a mandatory process. This experimental step is both time consuming and expensive. A multiphysics modeling tool that also takes into account the optical performances would therefore be an elegant solution to avoid these drawbacks. In this paper we compare some experimental results with numerical results obtained from a multiphysics suite. The local displacements of two space mirrors have been measured by use of electronic speckle pattern interferometry (ESPI) and the deformation itself has been calculated by subtracting the rigid body motion. After validation of the thermo-mechanical model, experimental and numerical wavefront errors are compared.
Research Center/Unit :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Languy, Fabian ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Georges, Marc ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Mechanical deformations of space mirrors under thermal stress and their effect on wavefront errors: measurements by ESPI and comparison with multiphysics modeling
Publication date :
07 September 2018
Event name :
Speckle 2018: VII International Conference on Speckle Metrology
Event place :
Janów Podlaski, Poland
Event date :
September 10th - 12th, 2018
Audience :
International
Journal title :
Proceedings of SPIE: The International Society for Optical Engineering
ISSN :
0277-786X
eISSN :
1996-756X
Publisher :
International Society for Optical Engineering, Bellingham, United States - Washington
Special issue title :
Proceedings of SPIE
Volume :
10834
Name of the research project :
SOCOEV
Funders :
Service public de Wallonie Économie, Emploi, Recherche: Direction générale opérationnelle de l'économie, de l'emploi et de la recherche
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Proba-V on ESA's website, https://earth.esa.int/web/eoportal/satellite-missions/p/proba-v
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