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Using a pulsed array to determine the position of a defect
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Hill, Samuel Joseph and Dixon, S. (2014) Using a pulsed array to determine the position of a defect. In: 40TH Annual Review of Progress in Quantitive Nondestructive Evaluation : Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing, Baltimore, Maryland, USA, 21–26 Jul 2013. Published in: AIP Conference Proceedings, Volume 1581 pp. 80-87. doi:10.1063/1.4864805 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.4864805
Abstract
The frequency dependent directivity of periodic permanent magnet electromagnetic acoustic transducers has been demonstrated and utilized to create a new NDT technique. The transducer, when pulsed with an appropriate broadband signal creates an interesting wave-front. This generated wave-front is smooth and continuous over a large solid angle, and has a frequency that varies as a function of angle to the array. Analytic models created to simulate this phenomena have been validated with experimental results using ultrasonic waves in metal samples. This pulsed approach provides a rapid means of flooding a region of space with a wave-front, whereby any wave that scatters or reflects off a body to a detector will have a distinct arrival time and frequency. This was experimentally verified using a periodic permanent magnetic EMAT array to create a two dimensional map of defects in an aluminum bar. Steering of the ultrasonic beam, by driving the array with a narrow-band signal, was also demonstrated and used as a comparison for the pulsed method.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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| Journal or Publication Title: | AIP Conference Proceedings | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 0094-243X | ||||
| Official Date: | 2014 | ||||
| Dates: |
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| Volume: | Volume 1581 | ||||
| Page Range: | pp. 80-87 | ||||
| DOI: | 10.1063/1.4864805 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 40TH Annual Review of Progress in Quantitive Nondestructive Evaluation : Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Baltimore, Maryland, USA | ||||
| Date(s) of Event: | 21–26 Jul 2013 |
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