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Sensors 2017, 17(5), 1023; doi:10.3390/s17051023

A New Electromagnetic Acoustic Transducer Design for Generating and Receiving S0 Lamb Waves in Ferromagnetic Steel Plate

1
National Engineering Research Center of Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 24 March 2017 / Revised: 19 April 2017 / Accepted: 26 April 2017 / Published: 4 May 2017
(This article belongs to the Special Issue Intelligent Sensing Technologies for Nondestructive Evaluation)
View Full-Text   |   Download PDF [4928 KB, uploaded 4 May 2017]   |  

Abstract

Electromagnetic acoustic transducers (EMATs) are non-contact, ultrasonic transducers that are usually kept within 5 mm from the sample surface to obtain a sufficient signal-to-noise ratio (SNR). One important issue associated with operation on a ferromagnetic plate is that the strong attraction force from the magnet can affect measurements and make scanning difficult. This paper investigates a method to generate fundamental, symmetric Lamb waves on a ferromagnetic plate. A coil-only, low-weight, generation EMAT is designed and investigated, operating at lift-offs of over 5 mm. Another design of an EMAT is investigated using a rectangular magnet with a much higher lift-off than the coil, of up to 19 mm. This results in a much lower force between the EMAT and sample, making scanning the EMAT much easier. View Full-Text
Keywords: electromagnetic acoustic transducer; EMAT; NDT; Lamb wave; magnetostriction electromagnetic acoustic transducer; EMAT; NDT; Lamb wave; magnetostriction
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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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He, J.; Dixon, S.; Hill, S.; Xu, K. A New Electromagnetic Acoustic Transducer Design for Generating and Receiving S0 Lamb Waves in Ferromagnetic Steel Plate. Sensors 2017, 17, 1023.

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