Article

Eddy-Current Nondestructive Testing Using an Improved GMR Magnetometer and a Single Wire as Inducer: A FEM Performance Analysis

ENSICAEN, Univ. of Caen, Caen, France
IEEE Transactions on Magnetics (impact factor: 1.36). 11/2010; DOI:10.1109/TMAG.2010.2052827 pp.3731 - 3737
Source: IEEE Xplore

ABSTRACT This paper describes an efficient nondestructive evaluation (NDE) eddy-current (EC) system using an improved giant magnetoresistance magnetometer (IGMRM) and a simple single wire as inducer. A three-dimensional finite-element method (3-D FEM) was implemented to evaluate the theoretical expected response of the system. The model was based on a modified magnetic vector potential and a reduced magnetic scalar potential, in conducting and nonconducting regions, respectively. The model robustness is established by comparing numerical and experimental results on a given benchmark aluminum plate sample. This efficient 3-D FEM model helps to understand the system performances. Moreover, the excitation frequency effect on the sensed signal is analyzed versus the benchmark sample thickness and the crack sizes. Results are also given and discussed in terms of signal-to-noise ratio.

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Keywords

benchmark sample thickness
 
crack sizes
 
efficient nondestructive evaluation
 
excitation frequency effect
 
given benchmark aluminum plate sample
 
improved giant magnetoresistance magnetometer
 
model robustness
 
modified magnetic vector potential
 
reduced magnetic scalar potential
 
signal-to-noise ratio
 
simple single wire
 
system performances
 
theoretical