Low-frequency sonar countermeasure

Details Low-frequency sonar countermeasure Low-frequency sonar countermeasure

2005-03-29

2005-03-29

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

C367S159000, C367S171000, C310S337000, C181S120000

Reexamination Certificate

active

06873572

ABSTRACT:
A multi-port projector of acoustic energy in water includes a cylindrical hollow transducer having open annular ends. A thin, flexible member is secured to each annular end to extend across each opening to be displaced by the transducer, and the transducer and flexible members form an interior sealed from ambient water. A battery/electronics module is in the interior and is spaced from the transducer and flexible members to couple driving signals to the transducer for reciprocally displacing it and the flexible members in response to the driving signals. An inert liquid fills the interior around the module, and an open truss on each annular end exposes the flexible members to the ambient water. Cylindrical portions coaxially extending with the transducer on a common longitudinal axis are connected to the open trusses for projecting acoustic energy of lower frequency than conventional cylindrical transducers of similar size.

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patent: 6275448 (2001-08-01), Kittower et al.

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