18 July 2018 Innovative real-time processing for solar adaptive optics
Author Affiliations +
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.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Éric Thiébaut, Éric Thiébaut, Michel Tallon, Michel Tallon, Loïc Denis, Loïc Denis, Maud Langlois, Maud Langlois, Clémentine Béchet, Clémentine Béchet, Gil Moretto, Gil Moretto, Bernard Gelly, Bernard Gelly, } "Innovative real-time processing for solar adaptive optics", Proc. SPIE 10703, Adaptive Optics Systems VI, 107031I (18 July 2018); doi: 10.1117/12.2313776; https://doi.org/10.1117/12.2313776


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