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Sensors 2016, 16(5), 740; doi:10.3390/s16050740

A Longitudinal Mode Electromagnetic Acoustic Transducer (EMAT) Based on a Permanent Magnet Chain for Pipe Inspection

School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 12 April 2016 / Revised: 11 May 2016 / Accepted: 17 May 2016 / Published: 21 May 2016
(This article belongs to the Section Physical Sensors)
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Abstract

A new electromagnetic acoustic transducer (EMAT) design, employing a special structure of the permanent magnet chain, is proposed to generate and receive longitudinal guided waves for pipe inspection based on the magnetostriction mechanism. Firstly, a quantitative analysis of the excitation forces shows the influence of the radial component can be ignored. Furthermore, as the axial component of the static magnetic field is dominant, a method of solenoid testing coils connected in series is adopted to increase the signal amplitude. Then, two EMAT configurations are developed to generate and receive the L(0,2) guided wave mode. The experimental results show the circumferential notch can be identified and located successfully. Finally, a detailed investigation of the performance of the proposed EMATs is given. Compared to the conventional EMAT configuration, the proposed configurations have the advantages of small volume, light weight, easy installation and portability, which is helpful to improve inspection efficiency. View Full-Text
Keywords: longitudinal mode; pipe inspection; EMAT; permanent magnet chain; defect detection longitudinal mode; pipe inspection; EMAT; permanent magnet chain; defect detection
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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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Cong, M.; Wu, X.; Qian, C. A Longitudinal Mode Electromagnetic Acoustic Transducer (EMAT) Based on a Permanent Magnet Chain for Pipe Inspection. Sensors 2016, 16, 740.

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