Development and Characterisation of Composite Hydrophones

Abstract

Piezo components have been fabricated using lead zirconate titanate (PZT) and lead titanate (PT) as filler materials in a passive chloroprene rubber matrix. The temperature dependence of the dielectric parameters of PT composites has been studied. Effect of poling temperature and poling field on piezoelectric charge coefficient (d₃₃) has also been examined in order to achieve optimum polarization. Three types of hydrophones were developed using solid PZT, PZT composite and PT composite. Their acoustic sensitivities have been presented over a frequency range 10–100 KHz. The hydrophone based on lead titanate composite exhibited the highest acoustic sensitivity (-202 dB re IV/mPa) which could find numerous applications in underwater acoustics.

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