Realtime calibration of openloop piezoelectric a

Authors: Luigi Bruno Carmine Maletta

Publish Date: 2008/01/22

Volume: 4, Issue: 2, Pages: 97-103

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Abstract

In the present paper a piezoelectric actuator realized for interferometric applications is described together with a numerical model to simulate its electromechanical behavior The actuator is an openloop device made up of three piezoelectric ceramics glued into a stainless steel case and connected directly to the parallel port of a personal computer by control electronics developed on purpose It consists of a 16 bit digitaltoanalog converter whose voltage is fixed by the parallel port a charge amplifier which provides the voltage to the piezoelectric ceramics and a current divider for the control of the voltage on each channel The layout based on three active elements has allowed to obtain a device which is able to perform a straight expansion with a negligible tilting a desirable feature for an actuator used for interferometric applications The hysteretic behavior a typical characteristic of this kind of actuator was simulated by a numerical model based on the Prandtl–Ishlinskii hysteresis operator which shows a high capability to predict the input–output response at any level of the input signal and it is efficient enough for use in realtime applications

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