Receiving characteristics of d31.IMAGE.0 piezo-rubber hydrophone.

The piezoelectric properties and the receiving characteristics of d31-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 d31≠zero Piezo-Rubber hydrophones consisting of PT and PZT have some variations in the receiving characteristics. The relationship between this variation and -2d31/d33 or hardness of Piezo-Rubber is discussed.