Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review

Abstract

Pulsed eddy current (PEC) non-destructive testing and evaluation (NDT&E) has been around for some time and it is still attracting extensive attention from researchers around the globe, which can be witnessed through the reports reviewed in this paper. Thanks to its richness of spectral components, various applications of this technique have been proposed and reported in the literature covering both structural integrity inspection and material characterization in various industrial sectors. To support its development and for better understanding of the phenomena around the transient induced eddy currents, attempts for its modelling both analytically and numerically have been made by researchers around the world. This review is an attempt to capture the state-of-the-art development and applications of PEC, especially in the last 15 years and it is not intended to be exhaustive. Future challenges and opportunities for PEC NDT&E are also presented.

Enhanced material defect imaging with a radio-frequency atomic magnetometer

“…Traditionally, this is achieved by monitoring the impedance of the rf coil (or a dedicated pickup coil). [1][2][3][4][5] However, the simplicity of instrumentation in this type of measurement is outweighed by the signal sensitivity degradation at low frequencies. Alternatives involve the implementation of magnetic sensors such as giant magnetoresistance (GMR) magnetometers, [6][7][8] superconducting quantum interference devices (SQUIDs), 9,10 and radio-frequency magnetometers.…”

Effects of Coil Diameter in Thickness Measurement Using Pulsed Eddy Current Non-destructive Testing

“…The low duty cycle was chosen to minimize the heating effects of the coil and the components within the excitation circuit. For thickness measurement in this study, the parameter to be used is the peak value of the differential PEC signal [1], which is illustrated in Figure 4. …”

“…Being a member of eddy current testing (ECT) family, PEC shares the advantages of ECT, such as reliability and minimal preparation of samples. PEC has been employed in detection and characterization of defects, measurement of stress and measurement of thickness, among others [1]. The advantage of the PEC technique comes with its wide bandwidth of excitation frequencies that are excited simultaneously.…”

Towards end-to-end pulsed eddy current classification and regression with CNN

“…PEC has a wide range of frequencies, both surface and subsurface flaws of metal material can be detected. Therefore, PEC technique has been broadly utilized in the practices of non-destructive testing and evaluations [2] [3] [4] [5] [6]. Hence, automatically classifying and analyzing PEC signals have become a challenging problem for the research community.…”