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- W4313148112 abstract "Electromagnetic acoustic transducers (EMATs) are noncontact ultrasonic transducers. The transduction efficiency of a particular EMAT on a given specimen is dependent on the lift-off distance, which is the distance between the EMAT coil and the specimen surface. The transduction efficiency drops dramatically with increased lift-off distance, requiring EMATs to be in close proximity to the specimen, usually within a few millimeters. This article proposes a new EMAT method of applying an Fe3O4 coating to the test specimen and quantitatively studying the enhancement effect of Fe3O4 coating on lift-off distance. To eliminate the interference of the electrical and magnetic properties of the tested specimen, a nonmagnetic and nonconductive glass specimen is selected. The experimental results on a glass substrate coated with Fe3O4 demonstrate the feasibility of EMATs generating and receiving ultrasonic waves through the coating, by a magnetoelastic mechanism. The transduction efficiency of EMATs on an Fe3O4 coating does not increase linearly with the bias static magnetic field, and the maximum measured signal amplitude value occurs at a relatively low flux density of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim 0.12$ </tex-math></inline-formula> T. More specifically, it has been shown that the Fe3O4 coating can significantly enhance the lift-off distance of EMATs operating at 4 MHz to 8 mm on coated stainless steel. The performance of the Fe3O4 coating can be optimized, showing considerable potential to expand the application range of EMATs." @default.
- W4313148112 created "2023-01-06" @default.
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- W4313148112 date "2023-01-01" @default.
- W4313148112 modified "2023-10-16" @default.
- W4313148112 title "Enhancing the Lift-Off Performance of EMATs by Applying an Fe<sub>3</sub>O<sub>4</sub> Coating to a Test Specimen" @default.
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- W4313148112 doi "https://doi.org/10.1109/tim.2022.3223076" @default.
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