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Magnetic Induction Tomography Spectroscopy for Structural and Functional Characterization in Metallic Materials

Engineering Tomography Laboratory (ETL), Department of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK
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Materials 2020, 13(11), 2639; https://doi.org/10.3390/ma13112639
Received: 15 May 2020 / Revised: 6 June 2020 / Accepted: 8 June 2020 / Published: 9 June 2020
Magnetic induction tomography (MIT) is a powerful imaging system for monitoring the state of metallic materials. Tomographic methods enable automatic inspection of metallic samples making use of multi-sensor measurements and data processing of eddy current-based sensing from mutual inductances. This paper investigates a multi-frequency MIT using both amplitude and phase data. The image reconstruction algorithm is based on a novel spectrally-correlative total variation method allowing an efficient and all-in-one spectral reconstruction. Additionally, the paper shows the rate of change in spectral images with respect to the excitation frequencies. Using both spectral maps and their spectral derivative maps, one can derive key structural and functional information regarding the material under test. This includes their type, size, number, existence of voids and cracks. Spectral maps can also give functional information, such as mechanical strains and their thermal conditions and composition. View Full-Text
Keywords: spectral MIT; metal characterization; Cole–Cole plot spectral MIT; metal characterization; Cole–Cole plot
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Muttakin, I.; Soleimani, M. Magnetic Induction Tomography Spectroscopy for Structural and Functional Characterization in Metallic Materials. Materials 2020, 13, 2639.

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