A modified meander-line-coil EMAT design for signal amplitude enhancement

Enhancement of EMAT’s efficiency by using silicon steel laminations back-plate

“…where is the electrical conductivity of the specimen. Equations (1)(2)(3)(4)(5) show how the Lorentz force is related to , and . The magnitude of is proportional to the magnitudes of and , and the magnitude of is proportional to the magnitudes of and .…”

Improvement of unidirectional focusing periodic permanent magnet shear-horizontal wave electromagnetic acoustic transducer by oblique bias magnetic field

“…Although piezoelectric ultrasonic technology has significant advantages and shows greater efficacy, the presence of the couplant can restrict the application of such a transducer in extreme environments, including the inspection's accuracy and efficiency. Therefore, the electromagnetic ultrasonic testing technique has excellent advantages in these aspects [9][10][11][12][13][14].…”

Point-Focusing of Shear-Horizontal Wave Using Fan-Shaped Periodic Permanent Magnet Focusing Coils EMAT for Plate Inspection

“…Since such a transducer requires the couplant to transmit the vibration, it is not suitable for the detection in extreme environments such as high temperature and pressure [9]. Electromagnetic acoustic transducers (EMATs) mainly exchange energy by the coupling of the electromagnetic fields, so the couplant is not required, as with a piezoelectric transducer [10]- [15]. As one of the commonly used guided wave modes in the detection of metal plates, the Shear Horizontally (SH) polarized guided wave does not produce outof-plane displacement because of its particular polarization mode.…”