Analysis of the voltage drop across the excitation coil for magnetic characterization of skin passed steel samples
Keywords: 
Distortion analysis
Permeability
Hysteresis loops
Electromagnetic measurements
Non-destructive testing
Skin pass
Issue Date: 
2021
Publisher: 
Elsevier
ISSN: 
0263-2241
Note: 
This is an open access article under the CC BY-NC-ND license
Citation: 
Artetxe, I. (Itsaso); Arizti, F. (Fernando); Martínez-de-Guerenu, A. (Ane). "Analysis of the voltage drop across the excitation coil for magnetic characterization of skin passed steel samples". Measurement. (174), 2021, 109000
Abstract
The distortion analysis of magnetic excitation (DAME) method has been recently proposed to facilitate magnetic measurements for non-destructive testing in which pick-up coils are not necessary. This method is based on the distortion effect that the permeability of the sample generates on the voltage across the excitation coil. The aims of the method presented in the present paper are to amplify this distortion effect using a current mode-controlled magnetization and to extract a distortion signal, of high signal-to-noise ratio (SNR), from the voltage measured in the excitation coil by means of a demodulation technique. This methodology is applied to different skin passed steels to characterize the elongation level, which is still a challenge for conventional non-destructive electromagnetic techniques. The relationships between the parameters derived from the distortion and from the hysteresis are studied. Measurements according to the DAME method are performed to verify the improvement in sensitivity for magnetic characterization.

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