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US 7,406,873 B2Granted
Electromagnetic acoustic transducer
AssigneePII Limited
InventorsDavid Paige, Robert Andrew Mercel, Ian Sowerby
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AssigneePII Limited
InventorsDavid Paige, Robert Andrew Mercel, Ian Sowerby
Estimating the term…
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.
An electromagnetic acoustic transducer for exciting ultrasound in a material under test, the transducer comprising magnetic means for applying a DC magnetic field to the material under test, an electrical coil supplied by an alternating current source for providing an AC magnetic flux within the material under test, and a wear plate adapted to engage with and slide along the surface of the material under test, characterised in that the wear plate comprises an electrically conductive, ferromagnetic material having apertures therein configured to provide electrical and magnetic discontinuity in the wear plate and to permit penetration of both the DC magnetic field and the AC magnetic flux into the material under test so as to create, by their interaction, ultrasonic vibration of the material under test.
A method of exciting ultrasound in a material under test, using an electromagnetic acoustic transducer, the method comprising:
Dependencies are inferred from the claim text.