Electromagnetic acoustic transducers

Details Electromagnetic acoustic transducers Electromagnetic acoustic transducers

2006-04-11

2006-04-11

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

Reexamination Certificate

active

07024935

ABSTRACT:
An electromagnetic acoustic transducer for exciting ultrasound in a ferromagnetic material under test (2), includes a magnetic unit (6) arranged to be moved relative to the material under test (2) to magnetize a surface layer of the material, and an electrical winding (8) supplied by an alternating current source, the magnetic unit (6) and the electric winding (8), in use, being applied in sequence to the material under test (2) whereby the electrical winding (8) is positioned adjacent the material subsequent to magnetization thereof by the magnetic unit (8), the alternating magnetic flux created by the winding (8) interacting with the remanent magnetization of the material to create ultrasonic vibration of the material.

REFERENCES:
patent: 3898555 (1975-08-01), Tellerman
patent: 4678993 (1987-07-01), Vinnemann et al.
patent: 4727321 (1988-02-01), Huschelrath
patent: 5121058 (1992-06-01), Allison et al.
patent: 5987993 (1999-11-01), Meier et al.
patent: 6009756 (2000-01-01), Willems et al.
patent: 6766694 (2004-07-01), Hubschen
patent: WO 200204135 (2002-01-01), None

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