Analysis of adaptive optical elements made from piezolectric bimorphs

Kokorowski, S. A.

doi:10.1364/josa.69.000181

Cited by 70 publications

(24 citation statements)

References 8 publications

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“…The most promising techniques to date have used piezoelectric materials control techniques (Mikoshiba and Ahlborn 1972;Feinleib, Lipson, and Cone 1974;Adelman 1977;Kokorowski 1979;Steinhaus and Lipson 1979;Sato, Ueda, and Ikeda 1981;Forbes et al 1989;Ikramov et al 1992;Rigaut et al 1994;Susini, Labergerie, and Zhang 1994). Both unimorph and bimorph structures have been investigated for control of mirror curvature as a function of voltage input.…”

Section: Previous Research Into Control Of Thin-film Membrane Mirrorsmentioning

confidence: 99%

Deployable large aperture optics system for remote sensing applications.

Sumali¹,

Martin²,

Main

et al. 2004

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This report summarizes research into effects of electron gun control on piezoelectric polyvinylidene fluoride (PVDF) structures. The experimental apparatus specific to the electron gun control of this structure is detailed, and the equipment developed for the remote examination of the bimorph surface profile is outlined. Experiments conducted to determine the optimum electron beam characteristics for control are summarized. Clearer boundaries on the bimorphs' control output capabilities were determined, as was the closed loop response. Further controllability analysis of the bimorph is outlined, and the results are examined. In this research, the bimorph response was tested through a matrix of control inputs of varying current, frequency, and amplitude. Experiments also studied the response to electron gun actuation of piezoelectric bimorph thin film covered with multiple spatial regions of control. Parameter ranges that yielded predictable control under certain circumstances were determined. Research has shown that electron gun control can be used to make macrocontrol and nanocontrol adjustments for PVDF structures. The control response and hysteresis are more linear for a small range of energy levels. Current levels needed for optimum control are established, and the generalized controllability of a PVDF bimorph structure is shown. 4This page intentionally left blank.5

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Section: Previous Research Into Control Of Thin-film Membrane Mirrorsmentioning

confidence: 99%

Deployable large aperture optics system for remote sensing applications.

Sumali¹,

Martin²,

Main

et al. 2004

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“…In the non-filtered case γ(r) is simply the pupil function. For a BDM, the influence functions can easily be computed in the case of an infinite plate by solving a Poisson equation in the Fourier space (Kokorowski 1970):…”

Section: Basics Of Ao Controlmentioning

confidence: 99%

Piston control with adaptive optics in stellar interferometry

Vérinaud

Cassaing

2001

A&A

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Abstract. The general purpose of an adaptive optics system is to correct for the wavefront corrugations due to atmospheric turbulence. When applied to a stellar interferometer, care must be taken in the control of the mean optical path length, commonly called differential piston. This paper defines a general formalism for the piston control of a deformable mirror in the linear regime. It is shown that the usual filtering of the piston mode in the command space is not sufficient, mostly in the case of a bimorph mirror. Another algorithm is proposed to cancel in the command space the piston produced in the pupil space. This analysis is confirmed by simulations in the case of the GI2T interferometer located on Plateau de Calern, France. The contrast of the interference fringes is severely reduced in the case of a classical wavefront correction, even in short exposures, but is negligible with our algorithm, assuming a realistic calibration of the mirror. For this purpose, a simple concept for the calibration of the piston induced by a deformable mirror is proposed.

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“…The problems of passive damping under stresses lower than the phenomenological yield point on the basis of the elastic hysteresis model are generalized in [1]. A modern approach to these problems suggests introducing additional active elements into a structure being designed in order to control its vibrations [2][3][4][5][6][7]. In particular, distributed piezoelectric actuators/sensors have received considerable attention due to their higher potential applicability for the vibration control in various industrial and research areas [2,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…There is a vast number of publications concerning piezoelectric elements used in adaptive mirrors [6], for control of vibrations of large structures [4], for active acoustic control [8], etc. In [2,9,11,12,14,15], it is demonstrated that piezoelectric elements are efficient in damping vibrations of beams, plates, and shells.…”

Section: Introductionmentioning

confidence: 99%

Simplified monoharmonic approach to investigation of forced vibrations of thin wall multilayer inelastic elements with piezoactive layers under cyclic loading

2010

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A coupled dynamic problem of electromechanics for thin wall multilayer elements is formulated based on the Kirchhoff-Love hypotheses. In the case of harmonic loading, a simplified formulation is given using the monoharmonic approach and the concept of complex moduli to characterize the cyclic properties of the material. The problem of forced vibrations of three-layer beam, whose outer layers are made of a viscoelastic piezoactive material, and, the inner layer of a passive physically nonlinear material, is considered as an example to demonstrate the possibility of the technique elaborated. The possibility of damping the forced vibrations of a structure with the help of harmonic voltages applied to the external piezoactive layers is studied. Results obtained for the transient response of the beam using the complete model are compared with data found using the simplified model. Limitations on the simplified model application are specified.

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Analysis of adaptive optical elements made from piezolectric bimorphs

Cited by 70 publications

References 8 publications

Deployable large aperture optics system for remote sensing applications.

Deployable large aperture optics system for remote sensing applications.

Piston control with adaptive optics in stellar interferometry

Simplified monoharmonic approach to investigation of forced vibrations of thin wall multilayer inelastic elements with piezoactive layers under cyclic loading

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