Electricity: measuring and testing – Magnetic – Hysteresis or eddy current loss testing
Reexamination Certificate
2011-03-22
2011-03-22
Aurora, Reena (Department: 2858)
Electricity: measuring and testing
Magnetic
Hysteresis or eddy current loss testing
C324S202000, C324S228000
Reexamination Certificate
active
07911205
ABSTRACT:
A method of inspecting a test part is provided. The method includes positioning a coil on a surface of the test part and exciting the coil at a resonance frequency. The method also includes determining at least one of a resonance frequency shift and a quality factor of the coil and estimating an electrical conductivity of the test part based on at least one of the resonance frequency shift and the quality factor of the coil. The method further includes obtaining depth profile of residual stress using conductivity measurements at various resonance frequencies.
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C. V. Dodd & W. E. Deeds; “Analytical Solutions to Eddy-Current Probe-Coil Problems”; Journal of Applied Physics, vol. 39, No. 6; May 1968; pp. 2829-2838.
Plotnikov Yuri Alexeyevich
Tralshawala Nilesh
Aurora Reena
Clarke Penny A.
General Electric Company
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