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Alternating winding magnetostrictive electromagnetic acoustic transducer for pipe torsional guided wave generation

Lookup NU author(s): Professor Gui Yun TianORCiD

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Abstract

Ultrasonic guided waves propagating in bounded elastic media called waveguide are used extensively nowadays for rapid screening and long distance inspection of defect-prone structures. Various types of transducers are available for guided wave generation, including piezoelectric transducers and electromagnetic acoustic transducers (EMATs) etc.. EMAT is based on Lorentz force and/or magnetostrictive effect, and advantageous sometimes because of its non-contact nature. An alternating winding magnetostrictive type EMAT for torsional mode ultrasonic guided wave generation in a steel pipe is introduced in this paper. This new transducer design is composed of a pre-magnetized Nickel strip with circumferential static magnetic field and a coaxial coil in an alternating winding pattern. Theoretically this transducer design could be viewed as an extension of existing magnetostrictive type EMAT for SH guided wave generation in a steel plate. The alternating winding pattern enables accurate and easy control of guided wave mode. Results of experiments done on a steel pipe were shown to verify this transducer design. © 2009 IEEE.

Publication metadata

Author(s): Wang S, Huang S, Zhao W, Tian G

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IEEE Sensors Applications Symposium (SAS)

Year of Conference: 2010

Pages: 69-72

Publisher: IEEE

URL: http://dx.doi.org/10.1109/SAS.2010.5439401

DOI: 10.1109/SAS.2010.5439401

Library holdings: Search Newcastle University Library for this item

ISBN: 9781424449897

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