G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/90 (2006.01)
Patent
CA 2630899
A method and apparatus for conducting eddy current testing of a test object is disclosed, comprising the steps of generating a digital drive signal, converting the digital drive signal to an analog drive signal to drive a coil in a probe; placing the probe in proximity to a test object; receiving an electromagnetic field generated by the test object, which generates an analog return signal; converting the analog return signal to a digital return signal; measuring the amplitude of the digital return signal; measuring the phase shift of the digital return signal compared to the digital drive signal; determining the phase shift angle of the digital return signal based on the phase shift; determining the quadrature components of the digital return signal based on the digital return signal amplitude and the phase shift angle; and analyzing the quadrature components of the digital return signal to determine a material characteristic of the test object.
Cuffe John M.
Feydo Mark H.
Craig Wilson And Company
Ge Inspection Technologies Lp
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