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Proceedings Paper

NAOS performance characterization and turbulence parameters estimation using closed-loop data
Author(s): Thierry Fusco; Nancy Ageorges; Gerard Rousset; Didier Rabaud; Eric Gendron; David Mouillet; Francois Lacombe; Gerard Zins; Julien Charton; Christopher Lidman; Norbert N. Hubin
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Paper Abstract

An on-line estimation of turbulence parameters (r0, L0 and wind speed) and Adaptive Optics (AO) performance using NAOS [Nasmyth Adaptive Optics System] is presented. The method is based on the reconstruction of open-loop data from deformable mirror voltages and residual wavefront sensor slopes obtained in closed loop. This dedicated tool implemented in the real time computer of the NAOS system (first AO of the Very Large Telescope) allows without any loop opening to automatically monitor and display (every 15 seconds) both the atmospheric conditions and the system performance. We have validated the algorithm and tested its robustness on simulated and experimental data (both in laboratory and on sky). Using data obtained during more than two years of operations, statistical study on NAOS performance and turbulence characteristics are proposed. An on-line estimation of turbulence parameters (r0, L0 and wind speed) and Adaptive Optics (AO) performance is presented.

Paper Details

Date Published: 25 October 2004
PDF: 12 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.563009
Show Author Affiliations
Thierry Fusco, ONERA (France)
Nancy Ageorges, European Southern Observatory (Germany)
Gerard Rousset, ONERA (France)
Didier Rabaud, SHAKTIWARE (France)
Eric Gendron, Observatoire de Meudon (France)
David Mouillet, Observatoire Midi-Pyrenees (France)
Francois Lacombe, Observatoire de Meudon (France)
Gerard Zins, Observatoire de Grenoble (France)
Julien Charton, Observatoire de Grenoble (France)
Christopher Lidman, European Southern Observatory (Germany)
Norbert N. Hubin, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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