Affiliations: [a] Department of Electrical and Information Engineering
"Maurizio Scarano", University of Cassino, Cassino, Italy
Correspondence:
[*]
Corresponding author: Andrea Bernieri, Department of Electrical
and Information Engineering "Maurizio Scarano", University of Cassino, Via G.
Di Biasio, 43, 03043, Cassino (FR), Italy. Tel.: +39 0776 299 3671; Fax: +39
0776 299 3485; E-mail: bernieri@unicas.it
Abstract: The paper proposes the use of a suitable multi-frequency approach
applied to a novel instrument for eddy current non-destructive testing on
conductive materials. The instrument is composed by a smart eddy current probe,
based on a Giant Magneto Resistance sensor, and by a suitable processing unit.
Key features of the proposed instrument are the capability of detecting,
locating, and characterizing thin defects such as superficial and
sub-superficial cracks. The proposed multi-frequency solution, together with a
suitable data processing, allow both the sensitivity in the defect detection to
be increased and the ability to evaluate the defect characteristics in terms of
shape and dimension to be improved.
Keywords: Multifrequency Eddy Current Testing, GMR sensor, defect depth estimation
