Electrical impedance model of piezoelectric based sensor

An electrical impedance model of a thin disc piezo based sensor, used for resonance frequency analysis, is proposed in this paper. The sensor consists of the piezo element attached to a metallic strip with some adhesive and so, the response of the sensor is dependent on the geometry and modes of vibration of both the piezo element and the metallic strip attached to it. The experimentally measured impedance responses of the piezo elements and the corresponding sensors are compared with the simulated responses to validate the proposed model. The study reveals the effects of the various aspects of the piezo and the effect of addition of the metallic strip on the sensor response in terms of various impedance blocks.