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Lookup NU author(s): Professor Gui Yun TianORCiD
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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.
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
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