Materials Transactions Online

Materials Transactions, Vol.58 No.04 (2017) pp.641-645
© 2017 The Japan Institute of Metals and Materials

An Electromagnetic Helmholtz-Coil Probe for Arbitrary Orientation Crack Detection on the Surface of Pipeline

Wei Li1, Jiuhao Ge1, Yanyun Wu1, Xiaokang Yin1, Guoming Chen1, Xinan Yuan1, Jian Liu1 and Weichao Yang1

1Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao, 266580, China

Subjected to hoop stress and land movement load, the orientation of cracks on the surface of pipeline may be axial direction, circumferential direction or the others. In this paper, an electromagnetic Helmholtz-coil probe is presented to detect the oriented cracks on the surface of pipeline. A structure of equal-spaced TMR sensor array of the Helmholtz-coil probe is applied to scan the full circumference of the pipeline simultaneously in a single pass. The simulation and experiment results indicate that using the combination effect of the electric current perturbation and the magnetic flux leakage, the oriented crack can be mapped clearly.

[doi:10.2320/matertrans.M2016419]

(Received 2016/11/28; Accepted 2016/12/27; Published 2017/03/25)

Keywords: helmholtz-coil, oriented crack, surface crack, pipeline

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