Electromagnetic transducers for underwater low-frequency high-po

Details Electromagnetic transducers for underwater low-frequency high-po Electromagnetic transducers for underwater low-frequency high-po

1986-02-24

1987-04-21

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367175, H04R 1300

Patent

active

046601864

ABSTRACT:
An electromagnetically driven vibratile piston underwater transducer element generates acoustic intensity levels in the order of 50 peak Watts per square inch of radiating surface in the low audible frequency region in the vicinity of 1 kHz. The design achieves an efficiency greater than 50% and a very low Q of less than 2. The air gap is designed to seat mechanically if the unit is operated accidentally at high-power levels while acoustically unloaded thereby protecting the spring assembly from unsafe amplitudes of vibration. The mechanical protective design also serves to protect the transducer vibrating structure from failure if the transducer is exposed to the proximity of an underwater explosive shock wave. The transducer construction results in a minimum overall length so that when the transducer element is mounted in a planar array attached to the hull of a vessel the projection of the radiating surface of the array from the surface of the hull is minimized.

REFERENCES:
patent: 1321197 (1919-11-01), Fay
patent: 1526414 (1925-02-01), Bois-Reymond
patent: 1677945 (1928-07-01), Williams
patent: 3993973 (1976-11-01), Hutchins et al.
patent: 4090041 (1978-05-01), Mori et al.

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