21 July 2010 Smart structures for deformable mirrors actuated by piezocomposites
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Deformable mirrors actuated by smart structures are promising devices for next generation astronomical instrumentation. The piezo technology and in particular piezoceramics is currently among the most investigated structural materials. Fragility makes Ceramic materials extremely vulnerable to accidental breakage during bonding and embedding processes and limits the ability to comply to curved surfaces (typical of mirrors). Moreover lead-based piezoceramics typically have relevant additional masses. To overcome these limitations, we studied the applicability of composites piezoceramics actuators to smart structures with these purposes. We developed a combined Finite Element and Raytracing analysis devoted to a parametric performance predictions of a smart Piezocomposites based substrate applicable to deformable mirrors. We took in detail into account the possibility to change the focal length of the mirror keeping a satisfactory image quality. In this paper we present a specific type of Piezocomposite actuators and numerical/experimental techniques purposely developed to integrate them into smart structures. We evaluated numerical and experimental results comparing bonding and embedding of these devices.
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M. Riva, M. Riva, D. Di Sanzo, D. Di Sanzo, A. Airoldi, A. Airoldi, G. Sala, G. Sala, F. M. Zerbi, F. M. Zerbi, } "Smart structures for deformable mirrors actuated by piezocomposites", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77391N (21 July 2010); doi: 10.1117/12.857167; https://doi.org/10.1117/12.857167

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