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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 ISSN 1424-8220.
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Official URL: http://dx.doi.org/10.3390/s17051023
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, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Sensors | ||||||
| Publisher: | MDPI AG | ||||||
| ISSN: | 1424-8220 | ||||||
| Official Date: | 4 May 2017 | ||||||
| Dates: |
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| Volume: | 17 | ||||||
| Number: | 5 | ||||||
| Article Number: | 1023 | ||||||
| DOI: | 10.3390/s17051023 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) |
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