Abstract
In this work, an approach to the design of broadband thickness-mode
piezoelectric transducer is pre- sented. 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
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