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           superconducting transition measurement by an electromagnetic acoustic transducer

Dutton, B.; Gamboa-Perera, Fidel; Acosta, M.; Nahmad-Molinari, Yuri

doi:10.1063/1.2173070

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Detection is via a similar mechanism [2]. During measurements of the properties of a crystal the effects of temperature and magnetic field may be investigated [8,9,10]. In this case, the magnetic field for these experiments can be used as part of the EMAT in the place of the permanent magnet.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the magnetic field for these experiments can be used as part of the EMAT in the place of the permanent magnet. EMATs have been used for some recent measurements of single crystals [8,9,11]; however, practically there are still significant issues. EMATs are, by their very nature, sensitive to electrical noise, and their signal to noise ratio when compared with standard techniques can be poor if the environment is electrically noisy.…”

Section: Introductionmentioning

confidence: 99%

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

Edwards¹,

Perry

Backhouse

et al. 2011

J. Phys.: Conf. Ser.

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Edwards¹,

Perry

Backhouse

et al. 2011

J. Phys.: Conf. Ser.

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show abstract

“…Elastic constants are one of the fundamental properties of materials, and a measurement of these can give information about the state of the material and identify phase transitions [1][2][3][4][5][6][7][8][9]. Ultrasonic measurements provide an inexpensive alternative to neutron scattering measurements as a probe of the elastic constants.…”

Section: Introductionmentioning

confidence: 99%

Measuring elastic constants using non-contact ultrasonic techniques

Edwards

Perry²,

Cleanthous³

et al. 2012

AIP Conference Proceedings

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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 Gd 64 Sc 36 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.

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Anisotropy measurements in metal alloys using a laser/electromagnetic acoustic transducer array system

Dutton

Dewhurst

2006

Applied Physics Letters

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Rayleigh waves have been used to measure anisotropy in metal alloys using a transient Rayleigh pulse and an eight-element electromagnetic acoustic transducer array. The array spacing determined sensor separation, so that velocity measurements were made independent of the source-to-detector distance. Elimination of this distance, which would normally lead to systematic errors, has resulted in a measurement system capable of measuring velocities in metal to an uncertainty of 0.1%. As an example, variations in the Rayleigh velocity have characterized the anisotropy in rolled bars of aluminum.

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Y Ba 2 Cu 3 O x superconducting transition measurement by an electromagnetic acoustic transducer

Cited by 4 publications

References 8 publications

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

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

Measuring elastic constants using non-contact ultrasonic techniques

Anisotropy measurements in metal alloys using a laser/electromagnetic acoustic transducer array system

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