Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1984-12-14
1987-02-10
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367156, 310 26, H04R 1500, H01L 4106
Patent
active
046428020
ABSTRACT:
The transducer of this invention provides a one-to-one input-to-output frequency relationship by the use of different magnetostrictive materials within the same transducer, the materials each having positive and negative strain expansion coefficients. The materials are selectively driven so that the transducer motion is in one direction for one polarity of the sinusoidal drive signal and in the opposite direction for the other polarity of the drive signal. The resultant transducer is capable of greater peak-to-peak excursion of the radiating face for the same length of magnetostrictive material than in the prior art biased-material transducer.
REFERENCES:
patent: 2775749 (1956-12-01), Sussman
patent: 2947888 (1960-08-01), Harris
patent: 3207958 (1965-09-01), Chang
patent: 3217218 (1965-11-01), Steele
patent: 3349304 (1967-10-01), Wachter
patent: 3353040 (1957-11-01), Abbott
patent: 3406302 (1968-10-01), Lanyi et al.
patent: 4158368 (1979-06-01), Clark
patent: 4432080 (1984-02-01), Wardle
patent: 4438509 (1984-03-01), Butler
Butler John L.
Pozzo William M.
Jordan Charles T.
Raytheon Company
Santa Martin M.
Sharkansky Richard M.
Steinberger Brian S.
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