Electrodynamic permanent magnet transducer

Details Electrodynamic permanent magnet transducer Electrodynamic permanent magnet transducer

1991-05-20

1992-11-17

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

73643, G01N 924, G01N 2904

Patent

active

051649217

ABSTRACT:
An electrodynamic permanent magnet transducer for the non-destructive testing of workpieces by means of ultrasound. A soft magnetic housing is preferably provided in magnetically conducting contact with a pole surface of the permanent magnet to provide a compact magnetic return path for the magnetic field created by the permanent magnet. A hollow cylindrical body of nonmagnetic material is disposed to contactingly surround the permanent magnet to substantially eliminate magnetic short circuits parallel to the pole axis of the permanent magnet. The provision of two spiral transducer coils allows for the transmission and reception of ultrasound in a single permanent magnet transducer.

REFERENCES:
patent: 4777824 (1988-10-01), Alers
patent: 5050703 (1991-09-01), Graff et al.
B. W. Maxfield, et al., "Evaluating EMAT Designs for Selected Applications", Materials Evaluation Oct. 1987, pp. 1166-1183.

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