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Porous Piezoelectric Ceramic Transducer
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Porous piezoelectric ceramics of Pb(Zr, Ti)O3, (P-PZT), have been newly developed to apply to transducers in an echo sounder. The P-PZT was prepared from a mixture of PZT and poly-methyl-methacrylate (PMMA) powders. The piezoelectric characteristics of the P-PZT such as the dielectric constant (ε), voltage output constant (g constant), acoustic impedance (Z
c) and Q were evaluated. The P-PZT was employed in an echo sounder of 200 kHz, and its transmitting and receiving properties were measured in water. In these measurements, the P-PZT showed suitable characteristics for the echo sounder, which required high sensitivity, wide frequency bandwidth and high resolution. High sensitivity was realized by the large g constant and low Z
c of P-PZT which made the impedance matching with water much easier. In the acoustic response to the burst wave, the rise and fall time were shortened to 1/3 that of the conventional PZT transducer.
Title: Porous Piezoelectric Ceramic Transducer
Description:
Porous piezoelectric ceramics of Pb(Zr, Ti)O3, (P-PZT), have been newly developed to apply to transducers in an echo sounder.
The P-PZT was prepared from a mixture of PZT and poly-methyl-methacrylate (PMMA) powders.
The piezoelectric characteristics of the P-PZT such as the dielectric constant (ε), voltage output constant (g constant), acoustic impedance (Z
c) and Q were evaluated.
The P-PZT was employed in an echo sounder of 200 kHz, and its transmitting and receiving properties were measured in water.
In these measurements, the P-PZT showed suitable characteristics for the echo sounder, which required high sensitivity, wide frequency bandwidth and high resolution.
High sensitivity was realized by the large g constant and low Z
c of P-PZT which made the impedance matching with water much easier.
In the acoustic response to the burst wave, the rise and fall time were shortened to 1/3 that of the conventional PZT transducer.
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