An analytical solution for vertical coils near a multi-layered metallic pipe in Pulsed Eddy Current Testing

Analytical model for Pulsed Eddy Current Testing (PECT) of a multi-layered metallic pipe has not been solved, which limits the development of PECT technology. In this paper, the analytical model for vertical coils near a multi-layered metallic pipe is proposed. However, the analytical solution is ha...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2022-01, Vol.125, p.102570, Article 102570
Main Authors: Song, Yun, Wu, Xinjun
Format: Article
Language:English
Subjects:
Analytical model
Liquefied natural gas pipeline
Multi-layered metallic pipe
Pulsed eddy current testing
Transfer matrix method
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Summary:Analytical model for Pulsed Eddy Current Testing (PECT) of a multi-layered metallic pipe has not been solved, which limits the development of PECT technology. In this paper, the analytical model for vertical coils near a multi-layered metallic pipe is proposed. However, the analytical solution is hard to solve due to the large number of undetermined coefficients. Combined with the global matrix method, an improved transfer matrix across a conductor is established, which overcomes unsolvable problem in the traditional transfer matrix method. The induced voltage of pickup coil calculated based on the analytical model is verified by Finite Element Method (FEM) and experiments. Furthermore, the influence of several working conditions of pipelines on the PECT signal is studied based on the analytical model, providing guidance for engineering applications.
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2021.102570