Transformed stress direction acoustic transducer

Details Transformed stress direction acoustic transducer Transformed stress direction acoustic transducer

1990-04-18

1991-03-12

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367161, 310334, 310337, H04R 1700

Patent

active

049998196

ABSTRACT:
This invention describes an acoustic transducer assembly wherein an extremely high figure of merit (d.sub.h g.sub.h) is obtained as a result of converting incoming acoustic axial stress into radial extensional stress thereby multiplying its effect. The piezoelectric active element is encased in a metal sandwich enclosing two semilunar air spaces which allow the device to withstand extremely high hydrostatic pressure yet still respond to low level sound waves when acting as a hydrophone. The mechanical prestress induced by the differential coefficients of expansion between the metal case and the piezoelectric ceramic element also serves to prevent depolarization aging.

REFERENCES:
patent: 3158762 (1964-11-01), Horan
patent: 3346838 (1967-10-01), Johnson, III et al.
patent: 4135108 (1979-01-01), Besson

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