Closing the loop as an inverse problem: the real-time control of Themis adaptive optics

Éric Thiébaut; Michel Tallon; Isabelle Tallon-Bosc; Bernard Gelly; Richard Douet; Maud Langlois; Gil Moretto

doi:10.1117/12.2630497

29 August 2022 Closing the loop as an inverse problem: the real-time control of Themis adaptive optics

Éric Thiébaut, Michel Tallon, Isabelle Tallon-Bosc, Bernard Gelly, Richard Douet, Maud Langlois, Gil Moretto

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218507 (2022) https://doi.org/10.1117/12.2630497
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We have taken advantage of the implementation of an adaptive optics system on the Themis solar telescope to implement innovative strategies based on an inverse problem formulation for the control loop. Such an approach encompassing the whole system implies the estimation of the pixel variances of the Shack-Hartmann wavefront sensor, a novel real-time method to extract the wavefront slopes as well as their associated noise covariance, and the computation of pseudo-open loop data. The optimal commands are computed by iteratively solving a regularized inverse problem with spatio-temporal constraints including Kolmogorov statistics. The latency of the dedicated real-time control software with conventional CPU is shorter than 300 μs from the acquisition of the raw 400 × 400 pixel wavefront sensor image to the sending of the commands.

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Citation Download Citation

Éric Thiébaut, Michel Tallon, Isabelle Tallon-Bosc, Bernard Gelly, Richard Douet, Maud Langlois, and Gil Moretto "Closing the loop as an inverse problem: the real-time control of Themis adaptive optics", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218507 (29 August 2022); https://doi.org/10.1117/12.2630497

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