Acoustic wave sensor and method of making same

Details Acoustic wave sensor and method of making same Acoustic wave sensor and method of making same

1991-02-26

1992-10-13

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367157, 310337, 310322, H04R 1700

Patent

active

051557088

ABSTRACT:
A hydrophone for calibrating lithotripters includes a spot poled disc of piezoelectric material which is mounted on a brass cylinder backing. A coaxial cable is electrically connected to one surface of the disc through the brass backing and the opposing surface of the disc. A mixture of polymeric material and microballoons is provided to protect the interconnection of the center conductor and the opposing surface of the disc and prevent damage due to the incident ultrasonic shock waves. The brass backing is placed in a suitable housing of phenolic material. A process in fabricating the piezoelectric disc and assembling the hydrophone is disclosed.

REFERENCES:
patent: Re32123 (1986-04-01), Knight
patent: 4140936 (1979-02-01), Bullock
patent: 4254354 (1981-03-01), Keem
patent: 4460841 (1984-07-01), Smith et al.
patent: 4578611 (1986-03-01), Sadler
patent: 4656481 (1987-04-01), Mawhinney
patent: 4779244 (1988-10-01), Horner et al.
patent: 4782469 (1988-11-01), Granz et al.
patent: 4803671 (1989-02-01), Rochling et al.

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