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Pulsed eddy current differential probe to detect the defects in a stainless steel pipe

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6 Author(s)
Angani, C.S. ; Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Daejeon 305-600, South Korea ; Park, D.G. ; Kim, C.G. ; Leela, P.
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Pulsed eddy current (PEC) is an electromagnetic nondestructive technique widely used to detect and quantify the flaws in conducting materials. In the present study a differential Hall-sensor probe which is used in the PEC system has been fabricated for the detection of defects in stainless steel pipelines. The differential probe has an exciting coil with two Hall-sensors. A stainless steel test sample with electrical discharge machining (EDM) notches under different depths of 1–5 mm was made and the sample was laminated by plastic insulation having uniform thickness to simulate the pipelines in nuclear power plants (NPPs). The driving coil in the probe is excited by a rectangular current pulse and the resultant response, which is the difference of the two Hall–sensors, has been detected as the PEC probe signal. The discriminating time domain features of the detected pulse such as peak value and time to zero are used to interpret the experimental results with the defects in the test sample. A feature extraction technique such as spectral power density has been devised to infer the PEC response.

Published in:

Journal of Applied Physics  (Volume:109 ,  Issue: 7 )

Date of Publication:

Apr 2011

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