发明名称 |
Eddy current imaging apparatus and method using phase difference detection |
摘要 |
A phase-difference eddy current imaging system has a bridge circuit including a pair of coils with one or both coils disposed proximate an object that may contain one or more flaws. An oscillator is coupled to the bridge circuit and also to a pair of phase detectors that are coupled to the coils. A differential amplifier is coupled to the phase detectors for providing a comparison signal. A method for eddy current imaging using phase difference detection comprises providing relative movement between an object and at least one of a pair of coils, measuring the phase of the effective reactance in each of the coils, comparing the measured values, and formatting the compared values as a function of spatial position.
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申请公布号 |
US5006800(A) |
申请公布日期 |
1991.04.09 |
申请号 |
US19890431791 |
申请日期 |
1989.11.06 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
HEDENGREN, KRISTINA H. V.;HURLEY, DONNA C.;YOUNG, JOHN D. |
分类号 |
G01N27/82;G01N27/90 |
主分类号 |
G01N27/82 |
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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