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Proceedings Paper

Tests of the PSF reconstruction algorithm for NACO/VLT
Author(s): Yann Clénet; Christopher Lidman; Eric Gendron; Gérard Rousset; Thierry Fusco; Nick Kornweibel; Markus Kasper; Nancy Ageorges
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Paper Abstract

We have developed an PSF reconstruction algorithm for the NAOS adaptive optics system that is coupled with CONICA at ESO/VLT. We have modified the algorithm of Véran et al. (1997), originally written for PUEO at CFHT, to make use of the specific real-time wavefront-related data that observers with NACO receive together with their scientific images. In addition, we use the Vii algorithm introduced by Clénet et al. (2006) and Gendron et al. (2006) instead of the Uij algorithm originally used by Véran et al. (1997). Until now, tests on NAOS has been undertaken during technical time thanks to the NACO team at Paranal. A first test has been successfully performed to calibrate the orientation of reconstructed PSFs with respect to NACO images. We have also obtained two sets of PSF reconstruction test data with NACO in November 2006 and September 2007 to reconstruct PSFs. Discrepancies exist between the observed and reconstructed PSFs: their Strehl ratios are ~31% and ~39% respectively in Nov. 2006, ~31% and ~19% respectively in Sept. 2007. These differences may be at least partly explained by reconstructions that either did not account for the aliasing contribution or poorly estimated the noise contribution with the available noise information at that time. We have additionally just started to test our algorithm using the AO bench Sésame, at LESIA. Results are promising but need to be extended to a larger set of atmospheric conditions or AO correction qualities.

Paper Details

Date Published: 16 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701529 (16 July 2008); doi: 10.1117/12.789395
Show Author Affiliations
Yann Clénet, LESIA/CNRS, Observatoire de Paris (France)
Groupement d’Interet Scientifique PHASE (France)
Christopher Lidman, European Southern Observatory (Chile)
Eric Gendron, LESIA, Observatoire de Paris (France)
Groupement d’Interet Scientifique PHASE (France)
Gérard Rousset, LESIA, Univ. Paris Diderot (France)
Groupement d’Interet Scientifique PHASE (France)
Thierry Fusco, ONERA (France)
Nick Kornweibel, European Southern Observatory (Chile)
Markus Kasper, European Southern Observatory (Germany)
Nancy Ageorges, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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