Control of deformable mirrors in MOAO using H? optimization

Guesalaga A.; Guzman D.; Myers R.; Morris T.; Dipper N.; Basden A.

Keywords: dynamics, controller, synthesis, optimization, turbulence, modes, deformation, sensors, laser, optics, resolution, pulses, astrophysics, control, designs, parameter, shack-hartmann, method, dm, mirrors, adaptive, High, new, controllers, Wavefronts, Optimized, Multi-object, approaches, Zernike, Deformable, wavefront, Proportional-integral, Multi-objects, Xinetics


We present a new approach for the control of a deformable mirror (DM), part of a Multi Object Adaptive Optics (MOAO) on-sky demonstrator. The control is based on H? synthesis methods, achieving better performance than classical Proportional-Integral methods, while offering other appealing advantages such as an optimized design based on the temporal spectra of the wavefront and vibration rejection capabilities. We describe laboratory results obtained with a 97 actuator Xinetics DM, using a high-resolution Shack-Hartmann wavefront sensor for measuring DM surface. A connection between the turbulence dynamics represented in a Zernike basis and the controller requirements is studied, showing that the controller parameters and structure can be easily optimized for each Zernike mode according to their particular temporal spectra. © 2009 SPIE.

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Título de la Revista: Proceedings of SPIE - The International Society for Optical Engineering
Volumen: 7439
Editorial: SPIE
Fecha de publicación: 2009