Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2008-01-07
2010-10-26
Whittington, Kenneth J (Department: 2858)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
Reexamination Certificate
active
07821258
ABSTRACT:
A method is shown for magnetostrictive testing of structures using magnetostrictive techniques. A torsional guided wave is generated in the structure either directly, or through a magnetostrictive strip dry coupled or bonded to the structure. A permanent magnetic field is created by either permanent magnets or DC current for a permanent bias in a bias direction in the magnetostrictive strip and/or structure. By pulsing the magnetic field with an AC current pulse, a torsional guided wave will flow through the structure in the same direction as the permanent bias. By saturating the permanent magnetic field, a maximum torsional guided wave is reflected from defects in the structure to given an improved signal to noise ratio.
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Whittington Kenneth J
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