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The main disadvantage of electromagnetic acoustic transducers (EMATs) is their inefficiency in generating ultrasound. A new design of Rayleigh-wave EMAT is proposed with improved ultrasonic generation efficiency on non-ferromagnetic materials. The new EMAT's magnet is narrower than the meander-line coil used in the transducer and the coil itself has an uneven distribution of conductors. The principle...
Lamb wave has many applications in non-destructive testing as its advantages of the capability for long-range testing from a single location. Electromagnetic ultrasonic technique also has many advantages, such as being free of couplant and preconditioning. So, electromagnetic ultrasonic Lamb wave possesses great superiority in inspection. However, Lamb wave's characteristic of multi-modes and dispersion,...
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