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Sensors 2017, 17(5), 1038; doi:10.3390/s17051038

A Study of Applying Pulsed Remote Field Eddy Current in Ferromagnetic Pipes Testing

1
Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
2
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 24 March 2017 / Revised: 17 April 2017 / Accepted: 3 May 2017 / Published: 5 May 2017
(This article belongs to the Special Issue Intelligent Sensing Technologies for Nondestructive Evaluation)
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Abstract

Pulsed Remote Field Eddy Current Testing (PRFECT) attracts the attention in the testing of ferromagnetic pipes because of its continuous spectrum. This paper simulated the practical PRFECT of pipes by using ANSYS software and employed Least Squares Support Vector Regression (LSSVR) to extract the zero-crossing time to analyze the pipe thickness. As a result, a secondary peak is found in zero-crossing time when transmitter passed by a defect. The secondary peak will lead to wrong quantification and the localization of defects, especially when defects are found only at the transmitter location. Aiming to eliminate the secondary peaks, double sensing coils are set in the transition zone and Wiener deconvolution filter is applied. In the proposed method, position dependent response of the differential signals from the double sensing coils is calibrated by employing zero-mean normalization. The methods proposed in this paper are validated by analyzing the simulation signals and can improve the practicality of PRFECT of ferromagnetic pipes. View Full-Text
Keywords: PRFECT; ANSYS software; LSSVR; zero-crossing time; double sensing coils; Wiener deconvolution filter; zero-mean normalization PRFECT; ANSYS software; LSSVR; zero-crossing time; double sensing coils; Wiener deconvolution filter; zero-mean normalization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Luo, Q.; Shi, Y.; Wang, Z.; Zhang, W.; Li, Y. A Study of Applying Pulsed Remote Field Eddy Current in Ferromagnetic Pipes Testing. Sensors 2017, 17, 1038.

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