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Proceedings Paper

Wavefront curvature sensing in a 2.5m wide-field telescope: design, analysis, and implementation for real-time correction of telescope alignment
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Paper Abstract

In the framework of the design and manufacturing of a wide-field 2.5m telescope for the Observatorio Astrofisica de Javalambre (OAJ), AMOS has developed a novel wavefront sensing system that allows for real time correction of the alignment of the telescope without perturbing the acquisition of science images. The system is based on the wavefront curvature sensing (WCS) technique in which two out-of-focus images of a star are used for reconstructing the telescope wavefront error. Any deviations from the nominal wavefront error that is obtained after telescope final alignment are tracked and corrective actions can be implemented so as to optimize the telescope optical quality. The wavefront reconstruction technique and the associated corrections of the telescope alignment have been modelled and analyzed so as to validate the proposed approach before implementation in the telescope. To this aim, a bespoke coupled Zemax-Matlab model has been developed by AMOS. The model incorporates the algorithm for the telescope wavefront error reconstruction from out-of-focus images and computation of the alignment corrections in the telescope model. The justification of the wavefront sensing approach, its robustness against several sources of errors, as well as the selection of the appropriate equipment for its implementation in the telescope are discussed on the basis of this combined model.

Paper Details

Date Published: 23 September 2015
PDF: 9 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 962625 (23 September 2015); doi: 10.1117/12.2191274
Show Author Affiliations
Gregory P. Lousberg, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Vincent Moreau, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Olivier Pirnay, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Pierre Gloesener, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Carlo Flebus, Advanced Mechanical and Optical Systems (AMOS) (Belgium)


Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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