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Measuring elastic constants using non-contact ultrasonic techniques
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Edwards, R. S. (Rachel S.), Perry, R. (Robert), Cleanthous, D. (Demetra), Backhouse, D. J., Moore, I. J., Clough, A. R. and Stone, D. (2011) Measuring elastic constants using non-contact ultrasonic techniques. In: International Congress on Ultrasonics (ICU 2011), University of Gdańsk, 5-8 September 2011
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WRAP_Edwards_0271116-px-101012-rsedwards_lowt_2011.pdf - Accepted Version Download (423Kb) | Preview |
Official URL: http://dx.doi.org/10.1140/epjc/s10052-009-0874-9
Abstract
The use of ultrasound for measuring elastic constants and phase transitions is well established. Standard measurements use piezoelectric transducers requiring couplant and contact with the sample. Recently, non-destructive testing (NDT) has seen an increase in the use of non-contact ultrasonic techniques, for example electromagnetic acoustic transducers (EMATs) and laser ultrasound, due to their many benefits. For measurements of single crystals over a range of temperatures non-contact techniques could also bring many benefits. These techniques do not require couplant, and hence do not suffer from breaking of the bond between transducer and sample during thermal cycling, and will potentially lead to a simpler and more adaptable measurement system with lower risk of sample damage. We present recent work adapting EMAT advances from NDT to measurements of single crystals at cryogenic temperatures and illustrate this with measurements of magnetic phase transitions in Gd64Sc36 using both contact and non-contact transducers. We discuss the measurement techniques implemented to overcome noise problems, and a digital pulse-echo-overlap technique, using data analysis in the frequency domain to measure the velocity.
| Item Type: | Conference Item (Paper) |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Ultrasonic testing, Elasticity, Nondestructive testing |
| Date: | 2011 |
| Identification Number: | 10.1140/epjc/s10052-009-0874-9 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Funder: | European Research Council (ERC), Nuffield Foundation (NF), University of Warwick |
| Grant number: | 202735 (ERC) |
| Conference Paper Type: | Paper |
| Title of Event: | International Congress on Ultrasonics (ICU 2011) |
| Type of Event: | Conference |
| Location of Event: | University of Gdańsk |
| Date(s) of Event: | 5-8 September 2011 |
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| URI: | http://wrap.warwick.ac.uk/id/eprint/40119 |
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