Study on Electromagnetic Interference of the Pulsed Eddy Current Test for Operating Nuclear Power Plants
The pulse eddy current is mainly used in corrosion detection of wall thickness,and it is concerned by the non-calculation inspection industry because it can be detected under the insulation condition.Because pulsed eddy current detection of operating nuclear power plants is more susceptible to electromagnetic interference,the study starts from the spectrum analysis of pulsed eddy current detection signals,the strong interference effect of low frequency electromagnetic field interference on the detection signal of operating nuclear power plants is demonstrated.Then the spectrum of space electromagnetic interference of operating plants is identified and its influence on the pulse eddy current time domain detection signal is verified experimentally.A differential detection mode is proposed to eliminate the space electromagnetic interference by making the difference between the detection signal and the space reference signal,which can suppress the electromagnetic interference problem of the in-service unit.Finally,the in-service detection effect of pulsed eddy current in probe differential mode is verified by experiments under the operating state of nuclear power plant.
Pulsed eddy current testElectromagnetic interferenceCorrosion detection
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