Capped ceramic hydrophones

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 st...

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Bibliographic Details
Main Authors: Tressler, J.F., Dogan, A., Fernandez, J.F., Fielding, J.T., Uchino, K., Newnham, R.E.
Format: Conference Proceeding
Language:English
Subjects:
Bonding
Capacitance
Ceramics
Fabrication
Impedance
Piezoelectric actuators
Piezoelectric transducers
Polymers
Sonar equipment
Stress
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Description
Summary: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 d/sub 31/ and d/sub 33/ coefficients of the poled ceramic to now add together as opposed to subtracting from one another, thus magnifying the d/sub h/. By capping a PZT-552 disk, the d/sub h/ can be amplified by a factor of nearly 100 and the g/sub h/ by a factor of almost 50. These particular hydrophones show the most promise for use in shallow water applications.
ISSN:1051-0117
DOI:10.1109/ULTSYM.1995.495709