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Innovative real-time processing for solar adaptive optics
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Paper Abstract

Themis is a 90 cm solar telescope which undergoes a rejuvenation of its scientific instruments. In particular, it is about to be equipped with an adaptive optics (AO) system with a bandwidth of at least 1 kHz and featuring a 97 actuator deformable mirror and 10×10 Shack-Hartmann wavefront sensor. Nowadays, the computational power required by such a system can be provided by current multi-core CPU. We have therefore implemented from scratch the real-time control system in pure software using Julia,1 a new language for technical computations, and running on Linux OS. Our main motivation was to be able to exploit new advances in wavefront sensing and adaptive optics control.

With a computational cost comparable to state-of-the-art but sub-optimal methods used in solar AO, our wavefront sensing algorithm estimates the local slopes and their covariances following a maximum likelihood registration method.

Themis AO system has a modest size but can be used to assert the benefits of maximum a posteriori (MAP) wavefront sensing and control,2, 3 of accounting of the covariances of the measure and of the temporal correlation of the turbulent wavefront.

Paper Details

Date Published: 18 July 2018
PDF: 11 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107031I (18 July 2018); doi: 10.1117/12.2313776
Show Author Affiliations
Éric Thiébaut, Univ. Lyon, Univ. Lyon 1, ENS de Lyon, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Michel Tallon, Univ. Lyon, Univ. Lyon 1, ENS de Lyon, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Loïc Denis, Univ. Lyon, UJM-Saint-Étienne, CNRS, Institut d'Optique Graduate School, Lab. Hubert Curien (France)
Maud Langlois, Univ. Lyon, Univ. Lyon 1, ENS de Lyon, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Clémentine Béchet, Pontificia Univ. Católica de Chile (Chile)
Gil Moretto, Univ. Lyon, Univ. Lyon 1, ENS de Lyon, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Bernard Gelly, Instituto de Astrofísica de Canarias (Spain)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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