Inverse Problem Analyses with Noised Signals in Eddy Current Testing.

Inverse Problem in Nondestructive Testing Using Arrayed Eddy Current Sensors

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 ...

Characterization of Eddy-current Testing Inverse Problems Using Adaptative Databases

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...

Metamodels as Input of an Optimization Algorithm for Solving an Inverse Eddy Current Testing Problem

A new mean of solution of eddy current testing (ECT) inverse problems is presented herein. The aim is to characterize a defect within a generic work piece by inverting an ECT signal in a short time (less than 5 s on a standard PC). The inverse problem is solved using Particle Swarm Optimization (PSO). As inputs of this algorithm, a metamodel is used in order to reduce the computation load and t...

High Frequency Eddy Current Testing

This paper presents a nondestructive, high frequency electromagnetic evaluation method which can be applied for the examination of periodic conductive strips or conductive fibers using the evanescent modes generated in slits or in dielectric insulation between conductive fibers. For the detection of evanescent waves we propose the use of lenses with metamaterials, both conical Swiss roll type a...

Eddy Current Benchmark Problem – 3