Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1979-08-23
1981-10-13
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
73668, 73779, G01N 2904
Patent
active
042952140
ABSTRACT:
Disclosed is an electromagnetic acoustic transducer, including an electrical conductor adapted to carry an alternating current in a current plane, the current being conveyed by the conductor in uniformly spaced, parallel, and alternate directions at any instant, and a source of magnetic flux positioned to direct a static magnetic field parallel to the alternate directions, the transducer thereby being adapted to generate or detect a horizontally polarized shear wave in a ferromagnetic material. The transducer may be made unidirectional by adding a second electrical conductor adapted to carry a second alternating current 90.degree. out of phase with respect to the first alternating current in a second current plane substantially coplanar with the first current plane, the second current being carried by the second conductor at any instant in parallel and alternate directions spaced by the same uniform amount, the second conductor being parallel to but staggered from the first conductor by half of the uniform amount.
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Vasile et al., "Periodic Magnet . . . Application," 1977, pp. 84-88, Ultrasonics Symp. Phoenix, 1977.
Thompson, "Noncontact Transducers", 1977, pp. 74-83, 1777 Ultrasonics Symp.
Thompson, "Mechanisms of Electromagnetic . . . Polycrystal", 12/77, J. Appl. Phys., vol. 48, #12.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Moskowitz Nelson
Rockwell International Corporation
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