Bibcode
Thiébaut, Éric; Tallon, Michel; Denis, Loïc.; Langlois, Maud; Béchet, Clémentine; Moretto, Gil; Gelly, Bernard
Referencia bibliográfica
Proceedings of the SPIE, Volume 10703, id. 107031I 11 pp. (2018).
Advertised on:
7
2018
Número de citas
0
Número de citas referidas
0
Descripción
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.