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A new electromagnetic acoustic transducer design for generating and receiving S0 lamb waves in ferromagnetic steel plate

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He, Jianpeng, Dixon, Steve M., Hill, Samuel Joseph and Xu, Ke (2017) A new electromagnetic acoustic transducer design for generating and receiving S0 lamb waves in ferromagnetic steel plate. Sensors, 17 (5). 1023. doi:10.3390/s17051023

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Official URL: http://dx.doi.org/10.3390/s17051023

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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

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Sensors
Publisher: MDPI AG
ISSN: 1424-8220
Official Date: 4 May 2017
Dates:
DateEvent
4 May 2017Published
26 April 2017Accepted
Volume: 17
Number: 5
Article Number: 1023
DOI: 10.3390/s17051023
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access

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