Abstract
This article describes a study of the application of PZT ceramic in the field of sonar transducers. Fish-finding sonars, operating in the frequency range 20kHz–50kHz, require transducers which are very rugged and fairly inexpensive. Piezo-electric ceramics in the form of sandwich transducers have sometimes been employed for this purpose, but have suffered from the disadvantage of a high Q-factor and thus a narrow operating bandwidth. This work has explored the possibility of improving the coupling of a sandwich transducer to the medium (water) by means of intermediate layers, to give a wide operating bandwidth.
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