TY - GEN
T1 - Vibrations in AO control
T2 - Adaptive Optics Systems III
AU - Kulcsár, Caroline
AU - Sivo, Gaetano
AU - Raynaud, Henri François
AU - Neichel, Benoît
AU - Rigaut, François
AU - Christou, Julian
AU - Guesalaga, Andres
AU - Correia, Carlos
AU - Véran, Jean Pierre
AU - Gendron, Éric
AU - Vidal, Fabrice
AU - Rousset, Gérard
AU - Morris, Tim
AU - Esposito, Simone
AU - Quirós-Pacheco, Fernando
AU - Agapito, Guido
AU - Fedrigo, Enrico
AU - Pettazzi, Lorenzo
AU - Clare, Richard
AU - Muradore, Riccardo
AU - Guyon, Olivier
AU - Martinache, Frantz
AU - Meimon, Serge
AU - Conan, Jean Marc
PY - 2012
Y1 - 2012
N2 - 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 Telescope, 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.
AB - 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 Telescope, 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.
KW - Adaptive optics systems
KW - Atmospheric turbulence
KW - Discrete-time lqg control
KW - Disturbance identification
KW - H2 control
KW - Spectral analysis
KW - Tip/tilt control
KW - Vibration filtering
UR - http://www.scopus.com/inward/record.url?scp=84871781649&partnerID=8YFLogxK
U2 - 10.1117/12.925984
DO - 10.1117/12.925984
M3 - Conference Paper
SN - 9780819491480
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Adaptive Optics Systems III
Y2 - 1 July 2012 through 6 July 2012
ER -