Abstract
Pulsed eddy current (PEC) is an advanced Non-Destructive Testing (NDT) technique that uses transient waveform for their coil excitation. It has the advantage of gathering different depth information in a single excitation process, thus provide the solution towards the drawbacks by both single and multi-frequency eddy current testing. In this work, experimental and simulation investigations on PEC were conducted to establish the correlation between PEC signals and different defect i.e. crack, depths. Initial FEM simulation work has provided understanding of the underlying phenomena of the PEC results through the visualisation of the induced eddy current and defect interaction in the SS 304 sample. Features from the differential magnetic field transient profiles have provided information of the crack in terms of its depth and location. The understanding of the PEC responses and results can be extended for future work in quantitative evaluation of defect in conductive samples by PEC.
Highlights
Eddy current testing is one of the Non-Destructive Testing (NDT) methods which is based on electromagnetic principles and has been effectively been used on electrically conductive samples
The results show a good agreement with the simulation, whereby as the depth of the crack increases, the amplitude of the respective profiles increases
This paper has presented the work on pulsed eddy current (PEC) technique and the correlation between acquired PEC
Summary
Eddy current testing is one of the Non-Destructive Testing (NDT) methods which is based on electromagnetic principles and has been effectively been used on electrically conductive samples It allows the inspection of surface breaking as well as subsurface defects, due to the interaction between the induced eddy currents with the defects [1]-[3]. The limitation of eddy current penetration in both single and multi-frequency eddy current testing has become the main drawback in its application [7]. To counteract this limitation, the pulsed eddy current (PEC) technique has been introduced. This technique is based on pulsed (square or rectangular) excitation current and provides new perspectives for the detection and characterisation of defects in test samples through the measurement of transient response of the magnetic field [8]
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