Thermal Balance and Active Damping of a Piezoelectric Deformable Mirror for Adaptive Optics

Wang, Kainan; Alaluf, David; Preumont, André

doi:10.3390/act8040075

Cited by 10 publications

(13 citation statements)

References 7 publications

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“…Strain actuators are very efficient for controlling flat plates and PZT actuators are widely used in Adaptive Optics, e.g., [10]. However, the study of the strain actuation of an ultrathin spherical shell shows that the behavior is very different from that of a plate, because the spherical shell is much more rigid, leading to reduced amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Electrostrictive PVDF-TrFE Thin Film Actuators for the Control of Adaptive Thin Shell Reflectors

2020

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This paper presents the technology to control the shape of thin polymer doubly curved shell structures with a unimorph layer of strain actuators to achieve high quality, light-weight, foldable space reflectors. The selected active material is PVDF-TrFE deposited by spin coating; it is electrostrictive, isotropic and enjoys an excellent piezoelectric coefficient d 31 ≃ 15 pC/N when properly annealed, but has a nonlinear, quadratic behavior. The strain actuation is controlled by an array of segmented electrodes. The purpose of this study is to evaluate the material properties achieved in the manufacturing process. A simple, unidirectional model of electrostrictive material is considered and the material constants (electrostrictive constant Q 33 , piezoelectric constant d 31 , spontaneous polarization P s and poling strain S P ) are estimated from various static and dynamic experiments. The final part of the paper illustrates the control authority on a small demonstrator with seven independent electrodes and compares the experimental results with numerical finite element simulations.

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Section: Introductionmentioning

confidence: 99%

Electrostrictive PVDF-TrFE Thin Film Actuators for the Control of Adaptive Thin Shell Reflectors

2020

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“…Strain actuators are very efficient for to deform flat plate structures and deformable mirrors with active layers of piezoelectric actuators are widely used in Adaptive Optics (AO), for example, Reference [11]. However, the study on the strain actuation of an ultrathin spherical shell shows the morphing behavior is very different from that of a flat plate, because the rigidity of a spherical shell depends very much on the mode of solicitation (achieving a defocus with a given amplitude will be much more difficult than astigmatism).…”

Section: Introductionmentioning

confidence: 99%

Adaptive Shell Spherical Reflector Actuated with PVDF-TrFE Thin Film Strain Actuators

2020

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This paper discusses the design and manufacturing of a thin polymer spherical adaptive reflector of diameter D=200 mm, controlled by an array of 25 independent electrodes arranged in a keystone configuration actuating a thin film of PVDF-TrFE in d31-mode. The 5 μm layer of electrostrictive material is spray-coated. The results of the present study confirm that the active material can be modelled by a unidirectional quadratic model and that excellent properties can be achieved if the material is properly annealed. The experimental influence functions of the control electrodes are determined by a quasi-static harmonic technique; they are in good agreement with the numerical simulations and their better circular symmetry indicates a clear improvement in the manufacturing process, as compared to a previous study. The low order optical modes can be reconstructed by combining the 25 influence functions; a regularization technique is used to alleviate the ill-conditioning of the Jacobian and allow to approximate the optical modes with reasonable voltages.

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“…In Equation ( 2), w represents a weighting factor. It can be configured to balance the norms of matrices JP and JE with the aim of mitigating the condition number [7].…”

Section: Linear Interaction Matrices For Various Actuation Configurat...mentioning

confidence: 99%

A simulation on hierarchical wavefront control for large aperture lightweight polymer mirrors

Yu,

Gong,

Wang

2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems

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This paper explores a hierarchical shape control method for large, lightweight polymer mirrors with unimorph actuation. Two methods of generating strain-driven forces are discussed. The initial focus is on the study of linear interaction matrices for various actuation configurations. Subsequently, control algorithms are designed for a large active optics aperture. The controlled degrees of freedom for the injection spots of electron flux are estimated, and criteria for examining iteration convergence are proposed.

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Thermal Balance and Active Damping of a Piezoelectric Deformable Mirror for Adaptive Optics

Cited by 10 publications

References 7 publications

Electrostrictive PVDF-TrFE Thin Film Actuators for the Control of Adaptive Thin Shell Reflectors

Electrostrictive PVDF-TrFE Thin Film Actuators for the Control of Adaptive Thin Shell Reflectors

Adaptive Shell Spherical Reflector Actuated with PVDF-TrFE Thin Film Strain Actuators

A simulation on hierarchical wavefront control for large aperture lightweight polymer mirrors

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