Turbulence profiling methods applied to ESO's adaptive optics facility

Javier Valenzuela; Clémentine Béchet; Aurea Garcia-Rissmann; Frédéric Gonté; Johann Kolb; Miska Le Louarn; Benoît Neichel; Pierre-Yves Madec; Andrés Guesalaga

doi:10.1117/12.2054740

21 July 2014 Turbulence profiling methods applied to ESO's adaptive optics facility

Javier Valenzuela, Clémentine Béchet, Aurea Garcia-Rissmann, Frédéric Gonté, Johann Kolb, Miska Le Louarn, Benoît Neichel, Pierre-Yves Madec, Andrés Guesalaga

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 91481X (2014) https://doi.org/10.1117/12.2054740
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Two algorithms were recently studied for C²_n 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 C²_n 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.

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Javier Valenzuela, Clémentine Béchet, Aurea Garcia-Rissmann, Frédéric Gonté, Johann Kolb, Miska Le Louarn, Benoît Neichel, Pierre-Yves Madec, and Andrés Guesalaga "Turbulence profiling methods applied to ESO's adaptive optics facility", Proc. SPIE 9148, Adaptive Optics Systems IV, 91481X (21 July 2014); https://doi.org/10.1117/12.2054740

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