Archives of Acoustics, 40, 1, pp. 3–10, 2015
10.1515/aoa-2015-0001

An Approach to Design Broadband Air Backed Piezoelectric Sensor

Mohamed Galal Sayed ALI
Minia University
Egypt

Nour Zaky ELSAYED
Minia University
Egypt

Ebtsam Ali EID
Minia University
Egypt

In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.
Keywords: piezoelectric, equivalent circuits, impulse response, frequency response, matching layers, z-transform.
Full Text: PDF


DOI: 10.1515/aoa-2015-0001

Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN)