<title>Survey of piezoelectric material strain response to electron gun excitation</title>

Abstract

A plate of PZT5h was prepared with a single electrode on one face connected to a power amplifier. The opposite face was left as bare ceramic material which was then exposed to an electron beam. Sixteen strain gages were attached atop the electrode to measure the strain response and as a function of electrode potential (backpressure voltage). A range of sinusoidal voltage inputs were applied to the electrode and the strain response and current draw through the PZT were recorded.Electrode potentials between -15 and 100 V yield very predictable strain response and extremely small currents (approcimately 10 -7 -10 -6 amperes) which appear to be independent of the electrode potential. Below -15 V the current through the PZT suddenly increases to 10 µa. At -15 volts level the strain response is still predictable but, as the electrode voltage decreases the strain signal begins to display significant drift. The root cause of this phenomenon is examined with the aid of the deBroglie-Einstein postulate and the Schrödinger wave equation.

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

“…The linear relationship between input voltage and deflection also appears to deteriorate when V bp is less than 0 V at all of the coordinates shown. Hadinata and Main [26] also reported unstable behavior in piezoelectric strain response in PZT-5H generated by electron gun flux and negative electrode potentials. A comparison of displacements near the mirror tip (x ¼ 8.7 cm) to those nearer the mirror mid-section (x ¼ 4.9 cm) shows that displacements decrease from tip to base as would be expected of a structure experiencing a uniform moment excitation.…”

Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

“…It is interesting that there is significantly more hysteresis for the 400, 600, and 800 eV cases than for the 1000 eV case. The cause of this hysteresis is associated with the instability of electron gun shape control of piezoelectric materials in the negative voltage regime (Hadinata et al, 2001).…”