Piezoelectric ceramic hydrostatic sound sensor

Details Piezoelectric ceramic hydrostatic sound sensor Piezoelectric ceramic hydrostatic sound sensor

1990-12-05

1993-03-02

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367160, 367163, 310334, 310337, 29 2535, H04R 1700

Patent

active

051915596

ABSTRACT:
A piezoelectric ceramic hydrostatic sound sensor or transducer having high ensitivity to hydrostatic pressure is made by placing a flat plastic disc between two flat layers of green ceramic material, compressing and fusing the layers, heating to a first temperature at which the plastic decomposes, leaving a flat void in the ceramic, and heating to a second temperature at which the ceramic sinters. The transducer is provided with electrodes on its top and bottom surfaces. In a further improvement, ceramic particles are provided which are entrapped in the void; they render the sound sensor sensitive to inertial forces. In yet another improvement, the inside walls of the void are coated with a conductive noble metal connected to a terminal wire, whereby an additional electrode is provided for sensing the electromechanical response of the transducer.

REFERENCES:
patent: 3255431 (1966-06-01), Howatt
patent: 4766718 (1988-08-01), Utsumi et al.
patent: 4876179 (1989-10-01), Bast et al.
patent: 4876476 (1989-10-01), Kittaka et al.

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