Capped ceramic hydrophones

Author

Tressler, J.F. ; Dogan, A. ; Fernandez, J.F. ; Fielding, J.T., Jr. ; Uchino, K. ; Newnham, R.E.

Author_Institution

Int. Center for Actuators & Transducers, Pennsylvania State Univ., University Park, PA, USA

Volume

2

fYear

1995

fDate

7-10 Nov 1995

Firstpage

897

Abstract

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 d_h. By capping a PZT-552 disk, the d_h can be amplified by a factor of nearly 100 and the g_h by a factor of almost 50. These particular hydrophones show the most promise for use in shallow water applications

Keywords

dielectric losses; hydrophones; lead compounds; permittivity; piezoceramics; piezoelectric transducers; PZT; PZT-552 disk; PbZrO3TiO3; amplified d₃₁ coefficients; amplified d₃₃ coefficients; capped ceramic hydrophones; cymbal transducer; dielectric constant; dielectric loss; electroded surfaces; hydrostatic sensitivity; incident axial-direction stress; piezoelectric ceramic; radial stresses; shallow inner cavity; shallow water applications; tangential stresses; thin metal caps; Bonding; Capacitance; Ceramics; Fabrication; Impedance; Piezoelectric actuators; Piezoelectric transducers; Polymers; Sonar equipment; Stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE

Conference_Location

Seattle, WA

ISSN

1051-0117

Print_ISBN

0-7803-2940-6

Type

conf

DOI

10.1109/ULTSYM.1995.495709

Filename

495709