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Proceedings Paper

Vibration mitigation in adaptive optics control
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Paper Abstract

Perturbations affecting image formation on ground-based telescopes are composed of signals that are not only generated by the atmosphere. They often include vibrations induced by wind excitation on the system's structure, or induced by other sources of excitation like cryo-coolers, shutters, etc. Using state-space control design techniques (e.g., LQG control), efficient perturbation compensation can be obtained in adaptive optics systems. This requires in return an accurate dynamical perturbation model with manageable complexity. The purpose of this paper is to investigate how tip/ tilt state-space models can be constructed and identified from wavefront sensor (WFS) measurements and used for tip/ tilt correction. Several off-the-shelf time-domain identification approaches are considered, ranging from techniques such as subspace identification to extended Kalman filter. Results are compared with controllers that do not account for vibrations, like an integrator or an MMSE reconstructor. Performance improvement is illustrated by replay with on-sky data sets from Gemini South (GeMS and Altair).

Paper Details

Date Published: 13 September 2012
PDF: 16 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84470Z (13 September 2012); doi: 10.1117/12.926050
Show Author Affiliations
Caroline Kulcsár, L2TI, Institut Galilée, Univ. Paris 13 (France)
Paolo Massioni, L2TI, Institut Galilée, Univ. Paris 13 (France)
Gaetano Sivo, L2TI, Institut Galilée, Univ. Paris 13 (France)
ONERA (France)
Henri-François G. Raynaud, L2TI, Institut Galilée, Univ. Paris 13 (France)

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

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