Technical Diagnostics and Non-Destructive Testing, 2021, №02



2021 №02 (06)

DOI of Article 10.37434/tdnk2021.02.01

2021 №02 (02)

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Technical Diagnostics and Non-Destructive Testing #2, 2021, pp. 7-13

Three-dimensional visualization of the detected defects by eddy current computing tomography

O.O. Vertiy¹, V.M. Uchanin²

¹Kharkiv National University of Radio Electronics. 14 Nauky Ave., 61058, Kharkiv, Ukraine. E-mail: alexey.vertiy@gmail.com
²G.V. Karpenko Physico-Mechanical Institute of NASU. 5 Naukova str., 79060, Lviv, Ukraine. E-mail: vuchanin@gmail.com

Nondestructive computing tomography methods based on different physical phenomena are reviewed as an effective tool to solve many NDT problems in the context of NDE 4.0 revolution. Eddy current (EC) tomography principle and experimental set-up are presented to demonstrate the possibility to reconstruct the tomography images related to the distribution of material electric conductivity. A riveted joint of two aluminum alloy sheets with 2 mm long artificial crack like defects was selected as an example of complex enough structure for control. Investigations were carried out with two types of EC probes application: the first one – the traditional EC probe of absolute type with coaxial driving and sensing coils, and the second – low-frequency double differential EC probe of MDF 1201 type. The set of vertical (orthogonal to the inspected surface) slices for the rivet zone were obtained to demonstrate the effectiveness of EC tomography. The horizontal slices were analyzed to demonstrate the possibility to produce tomography images at different depths. Two-layer structures, consisting of upper sheets with thicknesses from 0 to 8 mm and 5 mm thick lower sheath with a crack like defect were applied to reconstruct the vertical tomography slices with double differential EC probe application. The latter results demonstrate the high penetration ability of inspection using double differentiation EC probes and the possibility to estimate the defect size and distance from the inspected surface. 34 Ref., 8 Fig.
Keywords: eddy current (EC) tomography, eddy current probe (EC probe), double differentiation EC probe, electric conductivity, tomography images, slices, riveted joints

Received: 18.03.2021

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