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Proceedings Paper

Turbulence profiling methods applied to ESO's adaptive optics facility
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Paper Abstract

Two algorithms were recently studied for C2n profiling from wide-field Adaptive Optics (AO) measurements on GeMS (Gemini Multi-Conjugate AO system). They both rely on the Slope Detection and Ranging (SLODAR) approach, using spatial covariances of the measurements issued from various wavefront sensors. The first algorithm estimates the C2n profile by applying the truncated least-squares inverse of a matrix modeling the response of slopes covariances to various turbulent layer heights. In the second method, the profile is estimated by deconvolution of these spatial cross-covariances of slopes. We compare these methods in the new configuration of ESO Adaptive Optics Facility (AOF), a high-order multiple laser system under integration. For this, we use measurements simulated by the AO cluster of ESO. The impact of the measurement noise and of the outer scale of the atmospheric turbulence is analyzed. The important influence of the outer scale on the results leads to the development of a new step for outer scale fitting included in each algorithm. This increases the reliability and robustness of the turbulence strength and profile estimations.

Paper Details

Date Published: 21 July 2014
PDF: 12 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91481X (21 July 2014); doi: 10.1117/12.2054740
Show Author Affiliations
Javier Valenzuela, Pontificia Univ. Católica de Chile (Chile)
European Southern Observatory (Germany)
Clémentine Béchet, Pontificia Univ. Católica de Chile (Chile)
Aurea Garcia-Rissmann, European Southern Observatory (Germany)
Frédéric Gonté, European Southern Observatory (Germany)
Johann Kolb, European Southern Observatory (Germany)
Miska Le Louarn, European Southern Observatory (Germany)
Benoît Neichel, Lab. d'Astrophysique de Marseille, CNRS, Aix Marseille Univ. (France)
Pierre-Yves Madec, European Southern Observatory (Germany)
Andrés Guesalaga, Pontificia Univ. Católica de Chile (Chile)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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