Pulsed Eddy Current: Feature Extraction Enabling In-situ Calibration and Improved Estimation for Ferromagnetic Application
Journal article
Nafiah, F., Tokhi, MO, Majidnia, S, Rudlin, J, Zhao, Z and Duan, F (2020). Pulsed Eddy Current: Feature Extraction Enabling In-situ Calibration and Improved Estimation for Ferromagnetic Application. Journal of Nondestructive Evaluation. 39 (52). https://doi.org/10.1007/s10921-020-00699-w
Authors | Nafiah, F., Tokhi, MO, Majidnia, S, Rudlin, J, Zhao, Z and Duan, F |
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Abstract | Steel pipes in process plant applications are often covered with insulation or weather protection that make inspection di_cult because the additional layers need to be penetrated to inspect the pipes' structure. The pulsed eddy current (PEC) method was devised as a means of inspection through the surface layers. However, the performance of a PEC system is dependent on the electrical and magnetic properties of the pipe material, which are generally unknown. Therefore, the use of a calibration block from a different steel will give inaccurate results. The concept of calibrating using 0 values obtained during inspection has undoubtedly been discussed in the literature. However, no comprehensive work was dedicated to using -1 to carry out calibration on inspected structure. The linear relationship of the -1 feature with the thickness squared, d2, is first established using analytical solutions, and the calibration is carried out using the feature values obtained in air and the reference signal. The performance of this technique is assessed and compared with the conventional 0 technique. Although both features exhibit similar immunity towards lift-off, 0 technique requires normalisation procedure, which contributes to determining more configuration parameters. Experimental results also suggest the relative advantage of using -1 feature in both wall thickness estimation and influences of noises. |
Keywords | Pulsed Eddy Current; Non-destructive Testing; Feature Extraction; Ferromagnetic Application; Pipeline Inspection |
Year | 2020 |
Journal | Journal of Nondestructive Evaluation |
Journal citation | 39 (52) |
Publisher | Springer |
ISSN | 0195-9298 |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s10921-020-00699-w |
Publication dates | |
Online | 30 Jun 2020 |
Publication process dates | |
Accepted | 22 Jun 2020 |
Deposited | 03 Jul 2020 |
Publisher's version | License File Access Level Open |
Accepted author manuscript | License File Access Level Controlled |
https://openresearch.lsbu.ac.uk/item/8q043
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Publisher's version
Nafiah2020_Article_PulsedEddyCurrentFeatureExtrac.pdf | ||
License: CC BY 4.0 | ||
File access level: Open |
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