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A remote field eddy current detector for detecting flaws in a metal pipe. It comprises several coils inserted axially into the metal pipe including an exciting coil for receiving an alternating current and generating field eddy current signals and two receiving coils. A differential signal representing the vectorial difference between eddy current signals from the two coils is obtained. The phase...
The flaw detector comprises a reference signal generator and an exciting coil to generate eddy current signals in the pipe. The exciting signal is attenuated at a predetermined level and a phase signal delays this signal to a predetermined phase angle. The attenuated and delayed signal are added to the received signal and a flaw data generator phase-compares the added and reference signal to generate...
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