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Paper Abstract

We present in this paper an analysis of several tip-tilt on-sky data registered on adaptive optics systems installed on different telescopes (Gemini South, William Herschel Telescope, Large Binocular Telescope, Very Large Tele­ scope, Subaru). Vibration peaks can be detected, and it is shown that their presence and location may vary, and that their origin is not always easy to determine. Mechanical solution that have been realized to mitigate vibrations are presented. Nevertheless, residual vibrations may still affect the instruments' performance, ranging from narrow high frequency vibration peaks to wide low frequency windshake-type perturbations. Power Spectral Densities (PSDs) of on-sky data are presented to evidence these features. When possible, indications are given regarding the gain in performance that could be achieved with adequate controllers accounting for vibration mitigation. Two examples of controller identification and design illustrate their ability to compensate for various types of disturbances (turbulence, windshake, vibration peaks, ...),showing a significant gain in performance.

Paper Details

Date Published: 13 September 2012
PDF: 14 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84471C (13 September 2012); doi: 10.1117/12.925984
Show Author Affiliations
Caroline Kulcsár, L2TI, Institut Galilée, Univ. Paris 13 (France)
Gaetano Sivo, L2TI, Institut Galilée, Univ. Paris 13 (France)
ONERA (France)
Henri-François Raynaud, L2TI, Institut Galilée, Univ. Paris 13 (France)
Benoît Neichel, Gemini Observatory (Chile)
Franҫois Rigaut, Gemini Observatory (Chile)
Julian Christou, Gemini Observatory (United States)
Andres Guesalaga, Univ. Catolica de Chile (Chile)
Carlos Correia, NRC Herzberg Institute of Astrophysics (Canada)
Jean-Pierre Véran, NRC Herzberg Institute of Astrophysics (Canada)
Eric Gendron, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Fabrice Vidal, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Gérard Rousset, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Tim Morris, Durham Univ. (United Kingdom)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Fernando Quiros-Pacheco, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Guido Agapito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Enrico Fedrigo, European Southern Observatory (Germany)
Lorenzo Pettazzi, European Southern Observatory (Germany)
Richard Clare, European Southern Observatory (Germany)
Riccardo Muradore, Univ. of Verona (Italy)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Frantz Martinache, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Serge Meimon, ONERA (France)
Jean-Marc Conan, ONERA (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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