High performance controllers towards ELT-sized adaptive optics systems

Léonard Prengère (1, 2) , Caroline Kulcsár (1) , Henri-François Raynaud (1) , Jean-Marc Conan (2)

1 Laboratoire Charles Fabry / Spim
2 ONERA - The French Aerospace Lab [Châtillon]

Adaptive Optics (AO) systems compensate the nefari-ous effects of atmospheric turbulence affecting image formation on ground-based telescopes. Deformable Mirrors (DMs) are inserted in the telescope optical path to correct for the deformations induced by turbulence, in real-time, using Wave Front Sensor (WFS) measurements. The upcoming AO systems for ELTs (Extremely Large Telescopes) will feature a huge number of WFS measurements and DM actuators, and the design of high performance controllers adapted to these dimensions is a real challenge. In this article we compare the performance of several controllers: standard integral action, LQG (Linear Quadratic Gaussian) based on Kalman filter, and a highly paralleliz-able LQG based on Distributed Kalman Filter (DKF), which is built on Fourier domain models. Performance evaluation for a Single Conjugated AO (SCAO) configuration of a VLT-like telescope (8m) allows to discuss the extension to ELT-size high performance controllers.

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Automatique / Robotique; Optique / photonique

Léonard Prengère, Caroline Kulcsár, Henri-François Raynaud, Jean-Marc Conan. High performance controllers towards ELT-sized adaptive optics systems. 8th International Symposium on Optronics In Defence And Security (OPTRO 2018), 2018. ⟨hal-01763017⟩