Process and device to reduce the resonant frequency of the cavit

Details Process and device to reduce the resonant frequency of the cavit Process and device to reduce the resonant frequency of the cavit

1996-02-20

1997-12-02

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367158, 367176, 310337, H04R 1700

Patent

active

056943741

ABSTRACT:
The invention is directed to the class of submersible electro-acoustic transducers such as double "Tonpilz" transducers, wherein it is desirable to reduce the resonant frequency of the transducers while maintaining a given output power emitted by the transducers. The transducer according to the invention includes at least one horn solid with the end of a motor pillar, a hollow rigid box surrounding the horn and delimiting with the horn a cavity. The cavity communicates via a port with an external fluid, and has determined dimensions and external volume. The transducer further includes a passive radiator made of a material denser than the external fluid. The radiator obturates the port and hangs at a periphery of the port by an elastic material.

REFERENCES:
patent: 5130953 (1992-07-01), Grosso
patent: 5363345 (1994-11-01), Boucher et al.
patent: 5483502 (1996-01-01), Scarpitta et al.
La tomographie acoustique des oceans --Robert Spindel & Peter Worcester, Pour La Science No. 150 Dec. 1990 --pp. 66-72.

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