Different nitrogen contamination level of weld material results in a minor difference in the material resistivity. An approach using pulsed eddy current (PEC) is presented in this paper for accurately measuring this minor resistivity variation in welds. The approach is based on measuring the decay time of the transient signal measured with high sensitivity giant magnetoresistive (GMR) sensor with pulsed excitation of an eddy current coil. It is seen that the decay time of source free eddy current, which is inversely correlated with the material resistivity. Weld metal samples with varying levels of nitrogen contamination levels are tested using the prototype probe and GMR signal demonstrating the feasibility of the approach.

Pulsed Eddy Current for Minor Resistivity Difference Measurement

A. Tamburrino
2017-01-01

Abstract

Different nitrogen contamination level of weld material results in a minor difference in the material resistivity. An approach using pulsed eddy current (PEC) is presented in this paper for accurately measuring this minor resistivity variation in welds. The approach is based on measuring the decay time of the transient signal measured with high sensitivity giant magnetoresistive (GMR) sensor with pulsed excitation of an eddy current coil. It is seen that the decay time of source free eddy current, which is inversely correlated with the material resistivity. Weld metal samples with varying levels of nitrogen contamination levels are tested using the prototype probe and GMR signal demonstrating the feasibility of the approach.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11580/71547
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