Vibration mitigation in adaptive optics control

Caroline Kulcsár; Paolo Massioni; Gaetano Sivo; Henri-François G. Raynaud

doi:10.1117/12.926050

13 September 2012 Vibration mitigation in adaptive optics control

Caroline Kulcsár, Paolo Massioni, Gaetano Sivo, Henri-François G. Raynaud

Proceedings Volume 8447, Adaptive Optics Systems III; 84470Z (2012) https://doi.org/10.1117/12.926050
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Perturbations affecting image formation on ground-based telescopes are composed of signals that are not only generated by the atmosphere. They often include vibrations induced by wind excitation on the system's structure, or induced by other sources of excitation like cryo-coolers, shutters, etc. Using state-space control design techniques (e.g., LQG control), efficient perturbation compensation can be obtained in adaptive optics systems. This requires in return an accurate dynamical perturbation model with manageable complexity. The purpose of this paper is to investigate how tip/ tilt state-space models can be constructed and identified from wavefront sensor (WFS) measurements and used for tip/ tilt correction. Several off-the-shelf time-domain identification approaches are considered, ranging from techniques such as subspace identification to extended Kalman filter. Results are compared with controllers that do not account for vibrations, like an integrator or an MMSE reconstructor. Performance improvement is illustrated by replay with on-sky data sets from Gemini South (GeMS and Altair).

Citation Download Citation

Caroline Kulcsár, Paolo Massioni, Gaetano Sivo, and Henri-François G. Raynaud "Vibration mitigation in adaptive optics control", Proc. SPIE 8447, Adaptive Optics Systems III, 84470Z (13 September 2012); https://doi.org/10.1117/12.926050

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