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Mathematical Problems in EngineeringVolume20142014, Article ID124968, 8 pages

Research Article

School of Information Science and Engineering, Northeastern University, Shenyang, Liaoning 110004, China

CNOOC China Co., Ltd., Beijing 100010, China

Received 28 April 2014; Revised 30 June 2014; Accepted 14 July 2014; Published 12 August 2014

Academic Editor: RuqiangYan

Copyright 2014 Zhenning Wu et al. 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.


Magnetic flux leakage MFL as an efficient method for pipeline flaw detection plays important role in pipeline safety. This nondestructive test technique assesses the health of the buried pipeline. The signal is gathered by an array of hall-effect sensors disposed at the magnetic neutral plane of a pair of permanent magnet in the pipeline inspection gauge PIG clinging to the inner surface of the pipe wall. The magnetic flux measured by the sensors reflects the health condition of the pipe. The signal is influenced by not only the condition of the pipe, but also by the lift-off value of the sensors and various properties of electronic component. The consistency of the position of the sensors is almost never satisfied and each sensor measures differently. In this paper, a new scheme of channel equalization is proposed for MFL signal in order to correct sensor misalignments, which eventually improves accuracy of defect characterization. The algorithm proposed in this paper is adaptive to the effects of error on the disposition of the sensor due to manufacturing imperfections and movements of the sensors. The algorithm is tested by data acquired from an experimental pipeline. The results show the effectiveness of the proposed algorithm.

Author: Zhenning Wu,Huaguang Zhang,Jinhai Liu,Zongjie Qiu,and Mo Zhao

Source: https://www.hindawi.com/


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