Electromagnetic acoustic transducers
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United States of America Patent
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Apr 11, 2006
Grant Date -
Aug 11, 2005
app pub date -
Jan 28, 2003
filing date -
Feb 5, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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