Modélisation et commande pour les optiques adaptatives des VLT et ELT : de l'analyse de performance à la validation ciel

Abstract : Adaptive Optics (AO) systems have revolutionized ground-based astronomical imagery, allowing for real-time compensation of turbulence-induced deformations of the optical wavefront, and therefore allowing to reach the diffraction limit. More recently, wide-field AO modalities have been proposed to expand the operational range of instruments by compensating anisoplanatism and increase sky coverage. Controlling such systems is certainly a key issue to further improve their performance and to converge towards the goals of the ELTs science programs.The first objective of this thesis work is to define a general-purpose performance analysis tool, enabling to compare different linear controllers through their error budgets, in order to improve existing instruments or make choices in the design of future instruments. To achieve this aim, a frequency-domain formalism is developed for single-conjugated AO and extended to wide-field configurations. It is shown that this tool allows to decompose controller performance using either simulations or on-sky data. New control strategies based on new disturbance models (turbulence, vibrations...) are proposed, and the improvement in performance is discussed based on their error budget. Furthermore, these results contributed to characterize an LQG controller with vibration mitigation that is to be integrated in the tip/tilt loop of the multi-conjugate AO system GeMS, at Gemini South Observatory, in Chile.
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Rémy Juvénal. Modélisation et commande pour les optiques adaptatives des VLT et ELT : de l'analyse de performance à la validation ciel. Optique [physics.optics]. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLO007⟩. ⟨tel-01661369⟩

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