Bimorph adaptive mirror

Ikramov, A V; Романов, С. В.; Roshchupkin, I M; Safronov, A G; Sulimov, A. O.

doi:10.1070/qe1992v022n02abeh003369

Cited by 5 publications

(2 citation statements)

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“…Piezoelectric actuation has been applied in a number of different active mirror designs including unimorph [9,10] and bimorph [11][12][13][14][15] mirrors. Thick glass mirrors with piston-type stack actuators pressing on the back of the mirror to cause deformation have also been demonstrated [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Noncontact Electron Gun Actuation of a Piezoelectric Polymer Thin Film Bimorph Structure

Martin

Main

2002

Journal of Intelligent Material Systems and Structures

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Noncontact electron gun actuation of a bimorphmirror structure composed of two polyvinylidene fluoride layers is demonstrated. The electric field is applied to the piezoelectric structure by controlling the potential of a nickel-copper electrode on one side of the bimorph mirror and subjecting the opposite, bare side of the bimorph to an electron flux. The electrode also serves as the reflecting surface of the thin film mirror structure. Significant characteristics of this actuation approach are demonstrated, including the ability to address discrete areas of the continuous mirror without affecting the global mirror shape and the persistence of the shape changes after the electron beam is turned off.

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Section: Introductionmentioning

confidence: 99%

Noncontact Electron Gun Actuation of a Piezoelectric Polymer Thin Film Bimorph Structure

Martin

Main

2002

Journal of Intelligent Material Systems and Structures

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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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