Sonar transducers

Details Sonar transducers Sonar transducers

1988-11-21

1991-05-14

Bentley, Stephen C.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367167, 367174, 310337, H04R 1700

Patent

active

050162284

ABSTRACT:
A high power, low frequency flextensional transducer for underwater use comprises a number of spaced piezo-electric element stacks between opposed inserts. The stacks are placed on the plane through the major axis of an elliptical flexural shell and the inserts are shaped to conform with the elliptical shape. The stacks are assembled with first tapered supports and complementary tapered slides are wedged between the shell inserts and the tapered supports until a required pre-stress is exerted by the shell on the piezo-electrical stacks. End-plates are attached to the elliptical shell to complete the transducer; the shell having a compression bonded layer of neoprene applied, including a peripheral serrated lip seal to seal against the end-plate while permitting flexing of the shell. A means to provide wide band-width performance is also disclosed. To extend the range of operational depths the cavity within the transducer is filled with a gas whose vapour pressure can be temperature-controlled.

REFERENCES:
patent: 2966656 (1960-12-01), Bigbie et al.
patent: 3274537 (1966-09-01), Toulis
patent: 4287582 (1981-09-01), Tocquet
patent: 4420826 (1983-12-01), Marshall, Jr. et al.
patent: 4764907 (1988-08-01), Dahlstrom et al.
patent: 4845687 (1989-07-01), Bromfield
Navy Technical Disclosure Bulletin, vol. 4, No. 8, Aug. 1979; Office of Naval Research, (Arlington, VA, U.S.A.), J. A. Pagliarini, Jr.; pp. 1-4.

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