NDLI: Mixed sensitivity H∞ control of magnetic fluid deformable mirrors

Content Provider	IEEE Xplore Digital Library
Author	Iqbal, A. Zhizheng Wu Ben Amara, F.
Copyright Year	2009
Description	Author affiliation: Department of Mechanical and Industrial Engineering, University of Toronto, Canada (Iqbal, A.; Zhizheng Wu; Ben Amara, F.)
Abstract	This paper presents experimental results on the H∞ control of a magnetic fluid deformable mirror (MFDM) used in retinal imaging adaptive optics (AO) systems. MFDMs are a recently proposed novel type of active optical elements called wavefront correctors, which constitute the central part of AO systems. They offer cost and performance advantages over existing wavefront correctors. They have been found particularly suitable for ophthalmic imaging systems where they can be used to compensate for the complex optical aberrations in the eye that blur the images of the internal parts of the eye. However, their practical implementation in clinical devices is hampered by the lack of effective methods to control the shape of their deformable surface. This paper presents a control algorithm that can be used to compensate for high-order, time-varying optical aberrations using a MFDM. The control algorithm is developed using the mixed-sensitivity H∞ design method which ensures optimal performance in tracking the desired wavefront shapes using MFDM and also limits the magnitude of the input control voltages. Experimental results showing the performance of a closed-loop system comprising the developed controller and a 19-channel prototype MFDM are presented.
Starting Page	305
Ending Page	310
File Size	902422
Page Count	6
File Format	PDF
ISBN	9781424442096
DOI	10.1109/ISOT.2009.5326052
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-21
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dynamic aberrations Magnetic liquids Control systems Optical imaging Retina Voltage control Optical control Shape control H∞ control Optimal control Mixed sensitivity Adaptive optics Magnetic fluid deformable mirrors Mirrors Optical sensors
Content Type	Text
Resource Type	Article

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