Papers by Keyword: Piezoelectric Wafer

Abstract: Measuring circuit and equivalent circuit of piezoelectric sensor and its parameters of voltage, capacitance and charge are analyzed. The intensity, the sensitivity and natural frequency of pressure sensor are designed. The influence factors and compensation method of pressure sensor nonlinear such as effective area of diaphragm, pre-tightening force, and temperature are analyzed. Key words: Sensor; Piezoelectric wafer; Measure circuit; Equivalent circuit; Nonlinear

Abstract: Damage detection in composite materials can be divided into active and passive approaches. The active approach is usually based on various non-destructive techniques utilizing actuators and/or receivers. Simple laser scans, revealing the change in Lamb wave response amplitudes, have been used to locate delamination and estimate its severity in a composite plate. The validity of the proposed method is demonstrated through experimental studies in which input signals exerted at piezoelectric (PZT) patches on a composite plate are successfully reconstructed by using the time reversal method. The ultimate goal of this study is to develop a reference-free damage diagnosis technique based on the time reversal process so that defects can be identified without relying on any past baseline data.