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Proceedings Paper

PSF reconstruction for MUSE in wide field mode
Author(s): R. Villecroze; Thierry Fusco; Roland Bacon; Pierre-Yves Madec
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Paper Abstract

The resolution of ground-based telescopes is dramatically limited by the atmospheric turbulence.. Adaptative optics (AO) is a real-time opto-mechanical approach which allows to correct for the turbulence effect and to reach the ultimate diffraction limit astronomical telescopes and their associated instrumentation. Nevertheless, the AO correction is never perfect especially when it has to deal with large Field of View (FoV). Hence, a posteriori image processing really improves the final estimation of astrophysical data. Such techniques require an accurate knowledge of the system response at any position in the FoV The purpose of this work is then the estimation of the AO response in the particular case of the MUSE [1] /GALACSI [2] instrument (a 3D mult-object spectrograph combined with a Laser-assisted wide field AO system which will be installed at the VLT in 2013). Using telemetry data coming from both AO Laser and natural guide stars, a Point Spread Function (PSF) is derived at any location of the FoV and for every wavelength of the MUSE spectrograph. This document presents the preliminary design of the MUSE WFM PSF reconstruction process. The various hypothesis and approximations are detailed and justified. A first description of the overall process is proposed. Some alternative strategies to improve the performance (in terms of computation time and storage) are described and have been implemented. Finally, after a validation of the proposed algorithm using end-to-end models, a performance analysis is conducted (with the help of a full end-to-end model). This performance analysis will help us to populate an exhaustive error budget table.

Paper Details

Date Published: 13 September 2012
PDF: 15 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84475W (13 September 2012); doi: 10.1117/12.925680
Show Author Affiliations
R. Villecroze, CRAL, Observatoire de Lyon (France)
ONERA (France)
Thierry Fusco, ONERA (France)
Roland Bacon, CRAL, Observatoire de Lyon (France)
Pierre-Yves Madec, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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