Ferrofluid transducer

Details Ferrofluid transducer Ferrofluid transducer

1979-11-16

1981-12-29

Tudor, Harold J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367168, 310 26, H04R 1500

Patent

active

043086039

ABSTRACT:
A magnetic fluid transducer for producing a low-frequency sound field in a fluid medium. The device comprises a non-magnetic cylindrical housing with end windows. The housing is surrounded by a magnetic-field-generator means and contains a magnetic fluid within the housing. The magnetic field penetrates the housing and interacts with the magnetic fluid. A body force is developed within the fluid which produces an internal pressure in local regions defined by the lines of magnetic flux. This internal pressure is transmitted by an acoustic transmitting medium to the surrounding fluid as a sound pressure level.

REFERENCES:
patent: 2984819 (1961-05-01), Miller
patent: 3371309 (1968-02-01), Rich
patent: 3917538 (1975-11-01), Rosensweig
"Magnetic Properties of Stable Dispersions of Subdomain Magnetite Particl, by Kaiser et al., Journal of App. Physics, vol. 41, No. 3, Mar. 1, 1970.

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