Results 161 to 170 of about 10,784 (189)
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Optimal design of EMAT transmitters
NDT & E International, 2004A three-part finite element model is developed that characterizes the ultrasonic pulse produced by an electromagnetic acoustic transducer (EMAT). The model represents several significant improvements over previously published works, as follows: (a) spatial inhomogeneities in the magnetic flux density are calculated and then incorporated in the ...
Koorosh Mirkhani +8 more
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2016
Many EMAT techniques have already been transferred from laboratory studies to field applications, in particular, for infrastructure (railroad, pipeline, etc.), steel industry, and petrochemical industry. The transfer began in 1970s at the latest, when the theoretical modeling was still under way.
Masahiko Hirao, Hirotsugu Ogi
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Many EMAT techniques have already been transferred from laboratory studies to field applications, in particular, for infrastructure (railroad, pipeline, etc.), steel industry, and petrochemical industry. The transfer began in 1970s at the latest, when the theoretical modeling was still under way.
Masahiko Hirao, Hirotsugu Ogi
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Portable Electromagnetic-Acoustic Thickness Meters (EMAT)
Russian Journal of Nondestructive Testing, 2004Two varieties of contactless electromagnetic-acoustic portable thickness meters with autonomous power supply, created on the basis of up-to-date digital technologies, are described. The instruments implement a new highly efficient design of magnetic field concentrator developed on the basis of new magnetic materials. The КРМ-Ц-Дельта thickness meter is
G. Ya. Bezlyud'ko +4 more
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Locomotive Wheel Inspection With EMAT Technology
Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries, 2004There is a need to analyze locomotive wheels for flank cracks in a non-destructive manner in order to prevent catastrophic failures. Flaw, shape, and size are desired parameters in establishing the quality of commercial tires. A variety of defects such as voids, inclusions, surface and internal cracks, or the like, must be discerned in order to prevent
B. R. Tittmann, S. Jayaraman
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Emat Pipe Inspection with Guided Waves
Welding in the World, 2012Electro Magnetic Acoustic Transducers (EMATs) are a well-known type of ultrasonic probes used for nondestructive evaluation (NDE) of electrically conductive materials. Conventional Ultrasonic Testing (UT) is performed by longitudinal waves and mode converted shear waves generated by piezoelectric probes.
Hans-Juergen Salzburger +2 more
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Validating EMAT Performance with an Operator
CORROSION 2021, 2021Abstract The primary focus of a pressurized piping systems integrity management program (IMP) is to provide safe, reliable operation. One of the preferred tools leveraged by operators is the use of in-line inspection (ILI) technologies to assess the integrity of their assets. A comprehensive inspection program using ILI systems to detect,
Matthew Romney, Sean Moran
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PULSED ELECTROMAGNET EMAT FOR HIGH TEMPERATURES
AIP Conference Proceedings, 2010We presented recently a design of Electromagnetic Acoustic Transducer (EMAT) that uses a pulsed electromagnet to provide the required magnetic field for operation. This new EMAT exhibited a significant improvement in the generated ultrasonic signal amplitude and signal to noise ratio, for operation on mild steel samples at room temperature, compared to
F. Hernandez-Valle +3 more
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EMAT Applied in the Aviation Industry
The 26th Congress of ICAS and 8th AIAA ATIO, 2008The goal of this paper is to show the result of the real measurement with EMAT system in the aviation industry. Common nondestructive evaluation (NDE) techniques used in the field are the eddy current and the ultrasound inspection. EMAT (Electro-Magnetic Acoustic Transducers) system is a combination of these two methods and exhibit an advantage in ...
Michal Kubinyi +2 more
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Guided wave thickness measurement with EMATs
Insight - Non-Destructive Testing and Condition Monitoring, 2003Guided waves can be used for the thickness measurement of a stainless steel vessel. Commonly used piezoelectric transducers for guided wave generation are often not suitable because of potential couplant contamination. Therefore, a non-contact electromagnetic acoustic transducer (EMAT) was used in this study for non-contact measurement.
Wei Luo, J L Rose
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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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