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Application of high-temperature superconducting wires to magnetostrictive transducers for underwater sonar

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3 Author(s)
Voccio, J.P. ; American Superconducting Corp., Westborough, MA, USA ; Joshi, C.H. ; Lindberg, J.F.

Recently discovered cryogenic magnetostrictive materials show maximum strains greater than any room temperature materials. These cryogenic magnetostrictors can be combined with high-temperature superconducting (HTS) coils to create a sonar transducer with high efficiency and high acoustic-power density. A prototype low-frequency (<1000 Hz) magnetostrictive transducer is described. This transducer uses a terbium-dysprosium (TbDy) magnetostrictor rod with HTS coils cooled to 50-80 K using a single-stage cryocooler. The device is designed for operation at water depths of 100 m and is believed to be the first fully integrated prototype demonstration of HTS

Published in:

Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 4 )