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Proceedings Article

NAOS performance characterization and turbulence parameters estimation using closed-loop data

[+] Author Affiliations
Thierry Fusco, Gerard Rousset

ONERA (France)

Nancy Ageorges, Christopher Lidman, Norbert N. Hubin

European Southern Observatory (Germany)

Didier Rabaud

SHAKTIWARE (France)

Eric Gendron, Francois Lacombe

Observatoire de Meudon (France)

David Mouillet

Observatoire Midi-Pyrenees (France)

Gerard Zins, Julien Charton

Observatoire de Grenoble (France)

Proc. SPIE 5490, Advancements in Adaptive Optics, 118 (October 25, 2004); doi:10.1117/12.563009
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From Conference Volume 5490

  • Advancements in Adaptive Optics
  • Kona, United States | June 21, 2004

abstract

An on-line estimation of turbulence parameters (r 0, L 0 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 (r 0, L 0 and wind speed) and Adaptive Optics (AO) performance is presented.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Thierry Fusco ; Nancy Ageorges ; Gerard Rousset ; Didier Rabaud ; Eric Gendron, et al.
"NAOS performance characterization and turbulence parameters estimation using closed-loop data", Proc. SPIE 5490, Advancements in Adaptive Optics, 118 (October 25, 2004); doi:10.1117/12.563009; http://dx.doi.org/10.1117/12.563009


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