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Capped ceramic hydrophones

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6 Author(s)
J. F. Tressler ; Int. Center for Actuators & Transducers, Pennsylvania State Univ., University Park, PA, USA ; A. Dogan ; J. F. Fernandez ; J. T. Fielding
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Attaching specially shaped thin metal caps, each containing a shallow inner cavity, to the electroded surfaces of a piezoelectric ceramic will significantly enhance its hydrostatic sensitivity. The presence of the cavities allows the metal caps to convert a portion of the incident axial-direction stress into radial and tangential stresses of opposite sign, thus allowing the amplified d31 and d33 coefficients of the poled ceramic to now add together as opposed to subtracting from one another, thus magnifying the dh . By capping a PZT-552 disk, the dh can be amplified by a factor of nearly 100 and the gh by a factor of almost 50. These particular hydrophones show the most promise for use in shallow water applications

Published in:

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE  (Volume:2 )

Date of Conference:

7-10 Nov 1995