Experimental results in eddy current non destructive testing based on superconductive and conventional electromagnetic probes

This paper deals with the electromagnetic nondestructive testing performed by SQUID magnetometry on stratified aluminum alloy plates as those commonly encountered in the aircraft industry. The anomalous magnetic fields genera ted by flaws with know electromagnetic characteristics have been modeled by a three-dimensional specific code based on a finite element formulation. T he numerical solution has correctly predicted the shape of the complicated magnetic field response due to the defect. Once accuracy and reliability of experimental data taken by superconductive probe have been tested, a bench mark-like problem has been faced. Measurements performed by conventional pr obes like fluxgate and inductive coil have been compared with the ones take n by innovative device based on superconductive materials.