Periodic magnet unidirectional transducer

Details Periodic magnet unidirectional transducer Periodic magnet unidirectional transducer

1979-04-23

1980-11-11

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73643, G01N 2904

Patent

active

042325579

ABSTRACT:
An electromagnetic transducer is provided which transmits and receives ultrasonic waves from a metallic part predominately in only one direction. At least two rows of permanent magnets are placed adjacent each other in a side-by-side relation. The N-S axes of the magnets are substantially parallel and adjacent magnets in each row have opposite polarity so that two periodic magnetic fields are created. The adjacent magnets are off-set by one-fourth period. Coils wrapped around each row of magnets are driven in phase quadrature in order to generate a unidirectional elastic wave in the metallic part. In another embodiment, sets of three rows of magnets are offset by one-sixth period and driven in 60.degree. phase shift.

REFERENCES:
patent: 4127035 (1978-11-01), Vasile

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