Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO

Elisabeth Brunner; Julien H. Girard

doi:10.1117/12.2055614

13 August 2014 Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO

Elisabeth Brunner, Julien H. Girard

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 914861 (2014) https://doi.org/10.1117/12.2055614
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The performance of a ground based telescope can depend greatly on the coherence time, a site and time varying parameter determining the required reaction bandwidth of an Adaptive Optics system. Recently, Fast Defocus (FADE), a method which measures the coherence time from defocus fluctuations in a small telescope introduced by atmospheric turbulence has been presented. In this work, FADE was implemented for the Nasmyth Adaptive Optics System (NAOS) of the VLT's UT4 to demonstrate suitability for large scale telescopes. Estimates of the coherence time for an examplary set of AO loop data were compared to results obtained with the DIMM and MASS instruments, showing good agreement which justify a future in depth analysis for large AO loop data samples provided by NAOS as well as the VLT's Spectro-Polarimetric High-contrast Exoplanet Research (SPHERE) instrument.

Citation Download Citation

Elisabeth Brunner and Julien H. Girard "Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO", Proc. SPIE 9148, Adaptive Optics Systems IV, 914861 (13 August 2014); https://doi.org/10.1117/12.2055614

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