Electromagnetic acoustic transducer

Details Electromagnetic acoustic transducer Electromagnetic acoustic transducer

2004-06-18

2008-08-05

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

Reexamination Certificate

active

07406873

ABSTRACT:
An electromagnetic acoustic transducer (12, 24) has one or a plurality of magnets for applying a DEC magnetic field to a material (4, 25) under test, and an electrical coil (2, 23) supplied by an alternating current source for, providing an AC magnetic flux within the material under test. A wear plate (16, 26) engages with an slides along the surface of the material under test. The wear plate (16, 26) is of electrically conductive ferromagnetic material and has apertures (17, 31) therein. Thus, both the DC field and the ACT flux can penetrate the material under test and create ultrasonic vibration of that material.

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