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EMAT measurements of in- and out-of-plane ultrasonic signals
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Edwards, R. S. (Rachel S.), Dixon, S., Fan, Yichao and Jian, X. (2008) EMAT measurements of in- and out-of-plane ultrasonic signals. AIP Conference Proceedings (No.975). pp. 841-848. doi:10.1063/1.2902751
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Official URL: http://dx.doi.org/10.1063/1.2902751
Abstract
Ultrasonic testing using electro-magnetic acoustic transducers (EMATs) is becoming a more well known technique for defect detection in electrically conducting and/or magnetic samples. Recent improvements to EMAT design have been possible through modelling of the EMAT behaviour, with the combination of experiments and modelling explaining measurement results and suggesting new applications. Rayleigh waves generated on thick samples are of particular interest for detection and characterisation of surface-breaking defects, for example rolling contact fatigue on the railhead, and such cracks often propagate at an angle to the surface normal. Measurements of both the in- and out-of-plane components are useful for characterising such cracking. Typical EMAT systems detect predominantly in-plane signals, with out-of-plane signals measurable using a much more expensive interferometer system. We have developed EMATs to measure predominantly in- or out-of-plane signals, and these detection EMATs have been used to measure the behaviour of Rayleigh waves close to defects, in order to understand the signal enhancement close to the crack opening. Measurements and modelling of closely spaced slots and angled defects identify the benefits of using both in- and out-of-plane signals for defect characterisation.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science > Engineering Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Electromagnets, Rayleigh waves, Ultrasonics, Nondestructive testing | ||||
| Journal or Publication Title: | AIP Conference Proceedings | ||||
| Publisher: | American Institute of Physics | ||||
| ISBN: | 978-0-7354-0494-6 | ||||
| ISSN: | 0094-243X | ||||
| Editor: | Thompson, D. O. and Chimenti, Dale E. | ||||
| Official Date: | 28 February 2008 | ||||
| Dates: |
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| Number: | No.975 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 841-848 | ||||
| DOI: | 10.1063/1.2902751 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Description: | Conference proceedings of 34th Annual Review of Progress in Quantitative Nondestructive Evaluation, Golden, CO, 22-27 Jul 2007 |
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| Conference Paper Type: | Paper | ||||
| Type of Event: | Conference |
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