Permanent magnet biased magnetostrictive transducer

Details Permanent magnet biased magnetostrictive transducer Permanent magnet biased magnetostrictive transducer

1985-05-10

1987-10-27

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

310 26, 367168, 381190, H04R 1500

Patent

active

047034645

ABSTRACT:
A transducer which uses paramagnetic magnetostrictive rods or bars, e.g., compositions of the lanthanide series of elements such as Tb.sub.0.3 Dy.sub.0.7 Fe.sub.2, has the bars biased with a lengthwise flux by a permanent magnet, e.g. samarium-colbalt, of high resistance to demagnetization by the alternating field applied to the bars by alternating current in a coil surrounding the bar. The magnet is outside the coil to reduce the ac field to which it is subjected. Uniformity of flux density along the length of the bars is enhanced by having adjacent ends of the bars subjected to like-polarity poles of the permanent magnets associated with each bar.

REFERENCES:
patent: 2421263 (1947-05-01), Herbst
patent: 2437270 (1948-03-01), Peek
patent: 2468837 (1949-05-01), Peek
patent: 2607814 (1952-08-01), Bloch
patent: 3418613 (1968-12-01), Trikilis
patent: 3721189 (1973-03-01), Bray
patent: 3783505 (1974-01-01), Schoen
patent: 4394754 (1983-07-01), Waters
patent: 4438509 (1984-03-01), Butler et al.
Smith et al., "Design of a Transducer using Rare-Earth Magnetostrictive Materials", U.S. Navy Journal of Underwater Acoustics, v. 27, #1, 1/77.
Butler et al., "Rare Earth Iron Octagonal Transducer", J. Acoust. Soc. Am. 67 (5), May 1980.
Akervold et al., "Rare-Earth Magnetostrictive Transducer and Material. . .", U.S. Navy J. of Underwater Acoustics, v. 27, #1, 1/77.

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