Transducer hydrophone with filled reservoir

Details Transducer hydrophone with filled reservoir Transducer hydrophone with filled reservoir

1984-10-23

1987-03-24

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

310800, 367163, H04R 1700

Patent

active

046530363

ABSTRACT:
A hydrophone device with one or more very small active spots located on a large continuous ferroelectric sheet, such as PVDF, overcomes many of the problems in prior art constructions associated with the high dielectric constant of various media in which the device is used. Additional improvements include increased signal to noise ratio and a sensitivity independent of the medium properties. The hydrophone device includes a piezoelectrically active sheet stretched and clamped on over the top of a hoop ring. A backing is attached to the back of the hoop ring. A low-dielectric material fills the space between the backing and the sheet. This material eliminates the capacitive loading effect which would otherwise be presented by the medium being probed.

REFERENCES:
patent: 2163650 (1939-06-01), Weaver
patent: 2417426 (1947-03-01), Mason
patent: 2468537 (1949-04-01), Benoff
patent: 2797399 (1957-06-01), Camp et al.
patent: 3368193 (1968-02-01), McQuitty et al.
patent: 3894169 (1975-07-01), Miller
patent: 4081786 (1978-03-01), Richard
patent: 4178577 (1979-12-01), Chi et al.
patent: 4433400 (1984-02-01), DeReggi et al.
patent: 4517665 (1985-05-01), DeReggi et al.

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