Review on system development in eddy current testing and technique for defect classification and characterization

Abstract

Eddy current testing (ECT) is one of the non-destructive evaluation techniques widely used, especially in oil and gas industries. It characterized noisy data to the less-than-perfect detection and as an indication of serious false alarm problem. However, not many researchers have described in detail the intelligent ECT crack detection system. This paper introduces a review of ECT technique and factors that affect the signal fundamental according to the hardware and software development. First, describe the magnetic excitation resources including the sinusoidal and pulse exciting signal. Second, outlines explanation about the ECT probe. The explanations are more about the probes development for air core probe and giant magnetoresistance probe. Third, there is discussion on ECT circuit that used including ECT system, ECT rotating magnetic field and application measurement for optimal control parameters. The defect in characterizations and measurement are discussed on the fourth part of this paper. The fourth part discusses the ECT lift-off compensation including the lift-off and application of intelligent technique in ECT. The limitations of lift-off for coil probe and compensation techniques also discussed in this part. Finally, a comprehensive review of previous studies on the application of intelligent ECT crack detection in nondestructive ECT is presented.

Classification and Quantitative Evaluation of Eddy Current Based on Kernel-PCA and ELM for Defects in Metal Component

“…Compared with other detection methods, eddy current testing has many advantages in detecting metal components. It can detect metal component defects [7] and other properties [8,9], especially on the surface and subsurface damage of metal components, such as cracks, folding, pore, and inclusions [10,11].…”

Challenges in improving the performance of eddy current testing: Review

“…Also discussed in detail were the limitation of utilizing the coil as a sensor and compensation techniques that have been used in the ECT. In another study, Ali et al 11 discussed in detail the method of the ECT and the parameters that impacted the signal fundamental in relation to the hardware and software. Garcı´a-Martı´n et al 12 delibertated an overview of the primary variables and the principles of ECT sensors.…”

Investigate the effect of lift-off on eddy current signal for carbon steel plate

“…Non-destructive testing (NDT) plays an important role in inspection of structural integrity of materials through detection and sizing of flaws. It is important to detect flaws in the materials at the early stage to prevent catastrophic failure [1,2]. Many material inspection methods have been reported in the reviewed literature, including magnetic flux leakage [3], ultrasonic [4] and acoustic [5].…”