Control of deformable mirrors in MOAO using H&#8734; optimization

Andrés Guesalaga; Dani Guzman; Richard Myers; Tim Morris; Nigel Dipper; Alastair Basden

doi:10.1117/12.826081

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17 September 2009 Control of deformable mirrors in MOAO using H_∞ optimization

Andrés Guesalaga, Dani Guzman, Richard Myers, Tim Morris, Nigel Dipper, Alastair Basden

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Proceedings Volume 7439, Astronomical and Space Optical Systems; 74390N (2009) https://doi.org/10.1117/12.826081
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

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.

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Andrés Guesalaga, Dani Guzman, Richard Myers, Tim Morris, Nigel Dipper, and Alastair Basden "Control of deformable mirrors in MOAO using H_∞ optimization", Proc. SPIE 7439, Astronomical and Space Optical Systems, 74390N (17 September 2009); https://doi.org/10.1117/12.826081

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