The Research Of 1-3 Piezocomposite Transducers

Underwater sound transducers play a very important role in the SONAR system. And the properties of the transducers are seriously affected by the transduction materials. 1-3 piezocomposites are one kind of the most popular new piezoelectric materials as its many advantages in practice. For example, 1-3 piezocomposite hydrophones have wider working band, higher sensitivity and lighter weight. 1-3 piezocomposite projectors have wider working band, pure thickness mode and higher transmitting voltage response. So, 1-3 piezocomposites are widely and frequently used in the underwater sound transducers.Firstly, The effect of each phase's material parameter and structure parameter (the piezoelectric phase volume fraction, the aspect ration of piezoelectric pillar and the thickness of 1-3 piezocomposite) on the 1-3 piezcomposite hydrophones' properties has been analyzed by the classical hydrostatic response model and finite element method software. Then a hydrophone with -192.5dB sensitivity below 100kHz and 186kHz resonance frequency was achieved by the optimized dimensions design.Secondly, The effect of each phase's material parameter and structure parameter (the piezoelectric phase volume fraction) on the 1-3 piezcomposite projectors' properties has also been analyzed by the classical thickness-mode oscillations model and finite element method software. The 1-3 piezocomposite projector can be used in the frequency 323kHz with peak transmitting voltage response 181dB.Finally, the hydrophone and projector were processed under a optimized dimensions. And hydrophone's received sensitivity, projector's impedance characteristic and transmitting voltage response were tested. The result shows that the 1-3 piezcomposite hydrophones's sensitivity is higher; the 1-3 piezcomposite projector's working band is wider, and it is proved that the used method is effective.