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Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

机译：压电双晶面镜的分布式传感与形状控制

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As part of a collaborative effort between Sandia National Laboratories and the211u001eUniversity of Kentucky to develop a deployable mirror for remote sensing 211u001eapplications, research in shape sensing and control algorithms that leverage the 211u001edistributed nature of electron gun excitation for piezoelectric bimorph mirrors 211u001eis summarized. A coarse shape sensing technique is developed that uses reflected 211u001elight rays from the sample surface to provide discrete slope measurements. 211u001eEstimates of surface profiles are obtained with a cubic spline curve fitting 211u001ealgorithm. Experiments on a PZT bimorph illustrate appropriate deformation trends 211u001eas a function of excitation voltage. A parallel effort to effect desired shape 211u001echanges through electron gun excitation is also summarized. A one dimensional 211u001emodel-based algorithm is developed to correct profile errors in bimorph beams. A 211u001emore useful two dimensional algorithm is also developed that relies on measured 211u001evoltage-curvature sensitivities to provide corrective excitation profiles for the 211u001etop and bottom surfaces of bimorph plates. The two algorithms are illustrated 211u001eusing finite element models of PZT bimorph structures subjected to arbitrary 211u001edisturbances. Corrective excitation profiles that yield desired parabolic forms 211u001eare computed, and are shown to provide the necessary corrective action.

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