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Proceedings Paper

What can be retrieved from adaptive optics real-time data?
Author(s): J. Kolb; N. Muller; E. Aller-Carpentier; P. Andrade; J. Girard
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Paper Abstract

In an AO system the correction to be applied to the Deformable Mirror is computed at each loop cycle from the residual slopes on the Wavefront Sensor and the Interaction Matrix of the system DM/WFS. But the a posteriori analysis of the DM commands and WFS slopes can also provide a wealth of information on the closed loop behavior. In this paper we present a non-exhaustive list of what can be learned from such data. We base our analysis on simulated data, on data recorded on ESO’s PEACE test bench, and on data recorded on the NAOS instrument at the VLT during technical nights in 2010 and 2011, in the framework of the preparation of the algorithms for the AO Facility. The topics presented include the reconstruction of the input turbulence in the WFS domain (pseudo open-loop slopes), the estimation of the seeing, turbulence profile, coherence time, wind speed and direction, the measurement of LGS spot size, the detection of vibrations via modal transfer functions, the identification of DM/WFS mis-registration and the optimal loop gain computation.

Paper Details

Date Published: 13 September 2012
PDF: 15 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84475U (13 September 2012); doi: 10.1117/12.926402
Show Author Affiliations
J. Kolb, European Southern Observatory (Germany)
N. Muller, European Southern Observatory (Germany)
E. Aller-Carpentier, European Southern Observatory (Germany)
P. Andrade, Faculdade de Engenharia da Univ. do Porto (Portugal)
J. Girard, European Southern Observatory (Chile)

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

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