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An eddy current array probe and method for lift-off compensation during operation without known lift references
An eddy current array probe and method for lift-off compensation during operation without known lift references
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机译:没有已知升程参考值的涡流阵列探头和用于在运行期间进行升程补偿的方法
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摘要
The invention provides a method for compensating the sensitivity variations induced by lift-off variations for an eddy current array probe. The invention uses the eddy current array probe coils in two separate ways to produce a first set of detection channels and a second set of lift-off measurement channels without the need to add coils dedicated to the lift-off measurement operation. Another aspect of the invention provides an improved calibration process which combines the detection and lift-off measurement channel calibration on a simple calibration block including a reference defect without the need of a pre-defined lift-off condition.
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