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2018 ; 8
(1
): 7025
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Magnetic Induction Spectroscopy for Permeability Imaging
#MMPMID29728584
Ma L
; Soleimani M
Sci Rep
2018[May]; 8
(1
): 7025
PMID29728584
show ga
The structural health monitoring of ferromagnetic materials is essential for
controlling product quality. This paper presents the first known
characterisation, utilising magnetic induction spectroscopy, of the magnetic
permeability of ferromagnetic materials, a property that can facilitate such
monitoring. Magnetic induction coils are interrogated by a sweep of excitation
frequencies in the range of 1-100?kHz, with amplitudes of induced voltages
collected from both non-magnetic and ferromagnetic specimens, and their
associated spectral permeability imaged. The reconstructed images show that
magnetic permeability can be reconstructed using frequency difference imaging in
the investigated frequency range. As such, the relative magnetic permeability of
a ferromagnetic specimen can be reconstructed without needing a time difference
measurement. This provides a robust imaging approach for the material
characterisation of ferromagnetic specimens.