1. Introduction Eddy current examination has its origin with Michael Faraday's discovery of electromagnetic induction in 1831. Faraday was a chemist in England during early 1800's and is credited with the discovery of electromagnetic induction, electromagnetic rotations as the magneto-optical effect, diamagnetism and other phenomena [1]. Faraday discovered that when a magnetic field passes thro...

Eddy current (EC) nondestructive testing (NDT) based on probe impedance changes in the crack regions is considered in this paper. For this a numerical simulation is introduced for the development of the EC-NDT system using 3D finite element software. This model is used to simulate the rectangular cracks with various dimension and prepares the data required for artificial neural network. The neu...

One of the main challenges in Eddy Current Testing (ECT) is the solution of the inverse problem, i.e., the determination of the defect properties knowing the measured data. To this end, many approaches and mathematical tools have been proposed. The so-called adaptive database-method has recently been developed. Its main idea is to store corresponding input-output data pairs in a database and, b...

Development of eddy current testing makes possible for the inspection of the conductivity variations, inspection of surface and beneath the surface of conductivity materials and liftoff property to characterize nonconductive materials.This paper deals with impedance analysis and analyzes liftoff distance effect using numerical method on eddy current testing. The focus of this paper is to first ...

Eddy current methods have evolved over the years both in terms of sophistication as well the range of applications ever since D. E. Hughes demonstrated the merit of the approach in 1879. Rapid advances in our capacity to model the underlying physical process have given us the ability to design probes that offer unprecedented levels of sensitivity and resolution. These advances have been accompa...

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 ...

Safety and reliability of a railway system primarily depends on the soundness of the critical components and their freedom from defects. With increased rail traffic carrying heavier loads at higher speeds, a quicker more efficient way of inspecting rails at manufacturing stage is now mandatory. At Jindal Steel and Power Ltd., India, a highly reliable and effective flaw detection method has been...

A fast crack profile reconstitution model in nondestructive testing is developed using an arrayed eddy current sensor. The inverse problem is based on an iterative solving of the direct problem using genetic algorithms. In the direct problem, assuming a current excitation, the incident field produced by all the coils of the arrayed sensor is obtained by the translation and superposition of the ...

The advent of GMR magnetic sensors and GMR sensor arrays with frequencyindependent sensitivity offers improvements in speed, depth, and resolution in eddy-current testing. Arrays of GMR magnetic sensors allow rapid scanning of an area for defects in a single pass. The small size and low power consumption of these solid-state magnetic sensors enable the fabrication of compact arrays of sensors o...