Non-contact ultrasonic measurements of the elastic constants of magnetic materials

Ultrasonic testing using contacting transducers such as quartz or PZT is well established. However, standard measurement techniques used require physical contact of the sample and ultrasonic transducer and some sort of couplant between the two. With this configuration there is a possibility of damag...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-03, Vol.286 (1), p.012050-5
Main Authors: Edwards, R S, Perry, R, Backhouse, D J, Moore, I J, Cleanthous, D, Clough, A R, Stone, D
Format: Article
Language:English
Subjects:
Contact
Couplants
Couplants (ultrasonic testing)
Data analysis
Elastic constants
Elastic properties
Lead zirconate titanates
Magnetic materials
Material properties
Measurement techniques
Physics
Thermal cycling
Transducers
Ultrasonic methods
Ultrasonic testing
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Summary:Ultrasonic testing using contacting transducers such as quartz or PZT is well established. However, standard measurement techniques used require physical contact of the sample and ultrasonic transducer and some sort of couplant between the two. With this configuration there is a possibility of damaging the sample, transducer or bond during testing, thermal cycling, or removal of the transducer. We present results taken using recent advances in non-contact methods of ultrasound generation and detection using electromagnetic acoustic transducers (EMATs), which offer some significant benefits over contact ultrasonic techniques. Circumventing the need for couplant removes the possibility of contaminating the system, which is an issue for some material property measurements, and allows easier measurements over a wider range of temperatures. An automated data analysis system has been developed which allows the velocity of sound in the sample, and hence the elastic constants, to be determined to a high accuracy. This technique is illustrated using measurements of the alloy Gd64Sc36.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/286/1/012050