Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1989-04-10
1990-03-06
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367156, 310 26, H04R 1500
Patent
active
049072099
ABSTRACT:
A low frequency sound producer including a plurality of magnetostrictive vibrators arranged seriatim end to end to define a ring. Each vibrator unit includes a plurality of laterally related magnetostrictive rods which, in the illustrated embodiment, are formed of rare earth magnetostrictive material. Structure is provided for compressively prestressing the rods. The prestressing structure includes permanent magnets for providing a permanent magnetic bias in the rods. Coils are magnetically coupled to the rods for causing the desired magnetostriction thereof corresponding to an input AC signal applied to the coils. Opposite ends of the individual vibrator units define facial abutments in defining the continuous ring configuration. In the illustrated embodiment, the ring configuration is polygonal and the facial abutment surfaces at the ends of the units define a 60.degree. included angle. The entire sound producer is provided with an outward enclosure of synthetic resin whereby each vibrator unit defines an enclosed water-sealed assembly.
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Woollett, "Relation of Basic Material Properties to Operating Transducer Parameters", U.S. Navy Journal of Underwater Acoustics, vol. 27, No. 1, pp. 25-37.
Butler et al., "Development of Two Rare-Earth Transducers", U.S. Navy Journal of Underwater Acoustics, vol. 27, No. 1, Jan. 1977, pp. 165-174.
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Sewell John M.
Werner William F.
Martin Marietta Corporation
Steinberger Brian S.
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