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Commande optimale en Optique Adaptative Classique et Multiconjuguée

Abstract : Atmospheric turbulence disturbs the propagation of light coming from astronomical objects. One can observe a loss of resolution on the image given by a telescope. Adaptive optics allows to recover the diffraction limited resolution. Multiconjugate adaptive optics also allows to enlarge the isoplanatic field.

On new adaptive optics systems (high dynamics and large field of view), the control law has to be choosen in a way that minimizes the residual error, notably the temporal error and the anisoplanatism error. We propose an optimal control , optimal with respect to the minimization of the residual phase variance, for classical and multiconjugate adaptive optics. It is based on the estimation of the turbulent phase with a Kalman filter followed by a state feedback and is developped in the state vector formalism. It takes into account the prior knowledge as the measurement noise, the turbulence profile in altitude, Kolmogorov statistics and the wind speed. We quantify the gain provided by this approach with respect to a usual approach in numerical simulations in the cases of classical and multiconjugate adaptive optics. We discuss the robustness of the performances of the optimal reconstruction.
We also present the preparation of an experimental validation at Onera.
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https://tel.archives-ouvertes.fr/tel-00004690
Contributor : Brice Le Roux <>
Submitted on : Monday, February 16, 2004 - 4:30:32 PM
Last modification on : Monday, October 12, 2020 - 10:27:27 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:20:11 PM

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Brice Le Roux. Commande optimale en Optique Adaptative Classique et Multiconjuguée. Automatique / Robotique. Université Nice Sophia Antipolis, 2003. Français. ⟨tel-00004690⟩

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