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

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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.

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          Most cited references34

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          Piezoelectric resonator arrays for tunable acoustic waveguides and metamaterials

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            Defect detection in pipes using guided waves

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              Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides.

              A magnetostrictive patch transducer (MPT) is a transducer that exploits the magnetostrictive phenomena representing interactions between mechanical and magnetic fields in ferromagnetic materials. Since MPT technology was mainly developed and applied for nondestructive ultrasonic testing in waveguides such as pipes and plates, this paper will accordingly review advances of this technology in such a context. An MPT consists of a magnetic circuit composed of permanent magnets and coils, and a thin magnetostrictive patch that works as a sensing and actuating element which is bonded onto or coupled with a test waveguide. The configurations of the circuit and magnetostrictive patch therefore critically affect the performance of an MPT as well as the excited and measured wave modes in a waveguide. In this paper, a variety of state-of-the-art MPT configurations and their applications will be reviewed along with the working principle of this transducer type. The use of MPTs in wave experiments involving phononic crystals and elastic metamaterials is also briefly introduced.
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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                21 May 2016
                May 2016
                : 16
                : 5
                : 740
                Affiliations
                School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; mingcong@ 123456mail.hust.edu.cn (M.C.); chunqiaoqian@ 123456mail.hust.edu.cn (C.Q.)
                Author notes
                [* ]Correspondence: xinjunwu@ 123456mail.hust.edu.cn ; Tel./Fax: +86-27-8755-9332
                Article
                sensors-16-00740
                10.3390/s16050740
                4883431
                27213400
                89857a93-ddda-4ef9-81fb-44be760d2fe2
                © 2016 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 12 April 2016
                : 17 May 2016
                Categories
                Article

                Biomedical engineering
                longitudinal mode,pipe inspection,emat,permanent magnet chain,defect detection

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