发明名称 |
Method and apparatus for digital measurement of an eddy current signal |
摘要 |
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.
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申请公布号 |
EP1995590(A1) |
申请公布日期 |
2008.11.26 |
申请号 |
EP20080156681 |
申请日期 |
2008.05.21 |
申请人 |
GE INSPECTION TECHNOLOGIES, LP |
发明人 |
CUFFE, JOHN M.;FEYDO, MARK H. |
分类号 |
G01N27/90 |
主分类号 |
G01N27/90 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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