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Entropy 2018, 20(9), 699; https://doi.org/10.3390/e20090699

Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution

School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Received: 6 August 2018 / Revised: 28 August 2018 / Accepted: 30 August 2018 / Published: 12 September 2018
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Abstract

The Koch curve exciting coil eddy current sensor is a kind of novel flexible planar eddy current probe. In this study, an intersection angle spectrum entropy index and a radial direction energy spectrum entropy were proposed to evaluate the eddy current distribution. Eddy current distributions induced by one turn of a circular coil and one turn of a second order Koch curve coil feed with different exciting frequency alternative currents and at different lift-off distances, were simulated and the eddy current distributions varying with lift-off distance in different exciting frequencies were compared by the two proposed indices. With the increase of the lift-off distance or the decrease of exciting frequency, the similarity between the shape of the Koch curve and the eddy current distribution became weakened and the degree of the concentration of the eddy current distribution in the specimen under the exciting coil was loosened. View Full-Text
Keywords: eddy current testing; nondestructive testing; fractal geometry; information entropy eddy current testing; nondestructive testing; fractal geometry; information entropy
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Chen, G. Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution. Entropy 2018, 20, 699.

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