Abstract
The use of a scanning magnetic microscope (SMM) with a high temperaturesuperconducting quantum interference device (SQUID) for quantitative measurements ineddy current nondestructive analysis (NDA) is presented. The SQUID has been used todetect the weak magnetic field variations around a small defect, close to a structural partgenerating an intensive magnetic field. The experimental data for a deep crack close to arivet in a multilayer conducting plate have been taken in a RF-shielded environment anddiscussed in the light of the theoretical predictions. The results show that eddycurrent NDA can distinguish subsurface crack signals from wider structural signals,with defects located 10 mm below the surface. Moreover, in order to visualizethe structure of the probing current when a circular induction coil is used, thesimulation of eddy currents in a thick unflawed conducting plate has been carriedout.
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