The piezoelectric properties and the receiving characteristics of d
31-zero Piezo-Rubber hydrophones are investigated. Piezo-Rubber is a piezoelectric composite material consisting of piezoelectric ceramic powder and Chloroprene rubber. The d31-zero Piezo-Rubber hydrophones consisting of lead titanate (PT) and lead zirconate-titanate (PZT) ceramic powder have almost flat frequency receiving characteristics. However, the d
31≠zero Piezo-Rubber hydrophones consisting of PT and PZT have some variations in the receiving characteristics. The relationship between this variation and -2d
31/d
33 or hardness of Piezo-Rubber is discussed.
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