Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1987-01-20
1988-08-09
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367175, 367172, 181110, H04R 1300
Patent
active
047633077
ABSTRACT:
A wide-range audio frequency underwater transducer is designed to make use of a massive small diameter vibratile piston driven by electromagnetic oscillatory forces to transmit omnidirectional uniform sound pressure level over the frequency range 100 Hz to 5 kHz. The rugged transducer design is adapted for low-cost mass production and can be used as a highly reliable expendable reference standard of source level for the calibration of in-situ stationary or moving sonar receiving systems. The magnitude of the source level can be accurately controlled by the magnitude of the electrical current supplied to the electrical winding over the entire frequency range of operation. A pressure equalization system is included in the design that permits use of the transducer at any depth down to 500 feet.
REFERENCES:
patent: 1640538 (1927-08-01), Du Bois-Reymond
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patent: 2903673 (1959-09-01), Harris
patent: 2978669 (1961-04-01), Harris
patent: 3118125 (1964-01-01), Sims
patent: 3760346 (1973-09-01), Kieser et al.
patent: 4025912 (1977-05-01), Rice
patent: 4466083 (1984-08-01), Willard et al.
patent: 4607382 (1986-08-01), Dijkstra et al.
Eldred John W.
Jordan Charles T.
Kurlat Gitta M.
Massa Donald P.
Massa Frank
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