
Proceedings Paper
Active control of a large deformable mirror for future E-ELTFormat | Member Price | Non-Member Price |
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Paper Abstract
Increasing dimensions of ground based telescopes and adaptive optics needs for these instruments require wide
deformable mirrors with a high number of actuators to compensate the effects of the atmospheric turbulence on the wave
fronts. The new dimensions and characteristics of these deformable mirrors lead to the apparition of structural vibrations,
which may reduce the rejection band width of the adaptive optics control loop.
The aim of this paper is the study of the dynamic behavior of a
1-meter prototype of E-ELT's deformable mirror in order
to identify its eigenmodes and to propose some ways to control its vibrations. We first present the first eigenmodes of the
structure determined by both finite element analysis and experimental modal analysis. Then we present the frequency
response of the prototype to a tilt excitation to estimate the effects of its vibrations on the adaptive optics loop. Finally
we suggest a method to control the dynamics of the deformable mirror.
Paper Details
Date Published: 28 July 2010
PDF: 11 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77361B (28 July 2010); doi: 10.1117/12.856236
Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)
PDF: 11 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77361B (28 July 2010); doi: 10.1117/12.856236
Show Author Affiliations
R. Gasmi, GEPI, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
D. Le Bihan, ONERA (France)
J. L. Dournaux, GEPI, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
D. Le Bihan, ONERA (France)
J. L. Dournaux, GEPI, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
J. C. Sinquin, CILAS (France)
P. Jagourel, GEPI, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
P. Jagourel, GEPI, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)
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