Results 201 to 210 of about 24,386 (242)
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The Journal of the Acoustical Society of America, 2000
An electromagnetic acoustic transducer for inducing and sensing vibrations in a cylindrical object and methods of using an electromagnetic acoustic transducer to determine resonant frequencies and physical properties of cylindrical objects. The electromagnetic acoustic transducers produce specific modes of vibration in cylindrical objects including ...
Ward L. Johnson +2 more
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An electromagnetic acoustic transducer for inducing and sensing vibrations in a cylindrical object and methods of using an electromagnetic acoustic transducer to determine resonant frequencies and physical properties of cylindrical objects. The electromagnetic acoustic transducers produce specific modes of vibration in cylindrical objects including ...
Ward L. Johnson +2 more
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Electromagnetic acoustic transducers as wideband velocity sensors
Applied Physics Letters, 1985The performance of electromagnetic acoustic transducers as wideband velocity sensors has been investigated, using a pulsed laser as a standard acoustic source.
D. A. Hutchins, D. E. Wilkins, G. Luke
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Electromagnetic — Acoustic Transducers (EMATs)
1993Electromagnetic-acoustic transducers (EMATs) are devices which can excite and detect ultrasonic waves with no contact to the surface of metal parts. The physical principles governing the operation of these devices are reviewed. Included are discussions of mechanisms of transduction, practical probe geometries, systems design, radiation characteristics ...
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Empirical modelling of electromagnetic acoustic transducer data
Measurement Science and Technology, 2000We characterize the observed phase and amplitude of acoustic birefringence data collected with an electromagnetic acoustic transducer. Our characterization models are extended versions of an idealized model for acoustic birefringence. In the extended models, angle-dependent terms account for observed variability in phase and amplitude which is not ...
K J Coakley, A V Clark, C S Hehman
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A frequency steerable electromagnetic acoustic transducer
Smart Materials and StructuresAbstract Electromagnetic acoustic transducers (EMATs) are convenient for non-destructive evaluation of plate-like structures since they can generate, without the need for contact with the medium under test, different types of ultrasonic guided waves. Guided-wave EMATs usually generate waves omnidirectionally or in a principal propagation
Lucas M Martinho +2 more
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MODELLINGOF ELECTROMAGNETIC ACOUSTIC TRANSDUCERS OPERATINGON FERROMAGNETIC MATERIALS
AIP Conference Proceedings, 2010The contactless nature of Electromagnetic Acoustic Transducers (EMATs) offers a series of advantages over traditional piezoelectric transducers, but these features are counter‐balanced by their relatively low signal‐to‐noise ratio. The implication is that full exploitation of EMATs needs detailed modelling of their operation.
R. Ribichini +5 more
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ELECTROMAGNETIC ACOUSTIC TRANSDUCER WITH CROSS-TALK ELIMINATION
The Journal of the Acoustical Society of America, 2013The electromagnetic acoustic transducer (EMAT) transducer disclosed herein is useful for the non-destructive analysis of objects. The transducer comprises a core having a winding and a coil disposed between the core and the object to be analyzed. One transducer can be used as a transmitter and another transducer as a receiver.
Arcady Reiderman, Stanislav W. Forgang
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An electromagnetic–acoustic transducer with pulsed biasing
Russian Journal of Nondestructive Testing, 2015Pulsed magnetizing systems of EMA transducers with a tangential biasing field with respect to the surface of a test object are considered. A method for calculating the parameters of a U-shaped pulsed electromagnet, which can produce strong magnetic fields in the material of a test object and allows the efficiency of exciting and receiving ultrasonic ...
A. V. Mikhailov +3 more
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2008
The analysis of magnetic Barkhausen noise (MBN) has been used to provide information about the stress state and microstructural properties of ferromagnetic materials. Recent work has shown that a technique using acoustic Barkhausen noise (ABN) detection can provide the similar capabilities as traditional MBN along with additional information for defect
Wilson J, Tian GY, Edwards RS, Dixon S
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The analysis of magnetic Barkhausen noise (MBN) has been used to provide information about the stress state and microstructural properties of ferromagnetic materials. Recent work has shown that a technique using acoustic Barkhausen noise (ABN) detection can provide the similar capabilities as traditional MBN along with additional information for defect
Wilson J, Tian GY, Edwards RS, Dixon S
openaire +2 more sources