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One of the main drawbacks of EMATs is their inefficiency in generating ultrasounds. To solve this problem, a new surface-wave EMAT design, whose magnet width is less than the coil, is proposed. The principle of the new EMAT is studied based on finite element simulation, which indicates that the EMAT is more efficient by taking advantage of both horizontal and vertical magnetic fields of the magnet...
Typically, permanent magnets used in the electromagnetic acoustic transducers (EMATs), will cause the difficulty of mobility for on-line detection of ferromagnetic materials. In this paper, a pulsed electromagnet EMAT (PE-EMAT) with the effective magnetic field duration of 400 µs is designed. A 2-D finite element model for the bulk wave PE-EMAT is presented including both the electromagnetic field...
Radiation pattern is an important characteristic of Lamb waves when applied to nondestructive testing and evaluation. However, this character cannot be analyzed by 2-D analytical or numerical models. In this paper, a 3-D finite element (FE) model is presented and frequency domain analysis is used to study the acoustic field of Lamb waves generated by electromagnetic acoustic transducers (EMATs). Based...
The elastic waves generated by traditional meander- line coil electromagnetic acoustic transducers (EMATs) propagate in two directions, overlapping the echo signals from defects with the same distances, and the defect echo signal is hard to distinguish from the edge-reflected signal when the EMATs are near the edge of a specimen. In this paper, a unidirectional EMAT with two meander-line coils is...
Electromagnetic acoustic technique shows great promise in defect detection and classification for being free of couplant, no requirement of surface preconditioning, and being able to excite pure surface acoustic wave, etc. However, the deficiency of designing theories of electromagnetic acoustic transducers (EMATs) makes its transduction efficiency poor. This paper makes improvement to EMAT design...
Electromagnetic acoustic technique possesses many distinct advantages, such as being free of couplant, no requirement of test-piece preconditioning, and being able to excite pure surface acoustic wave, etc. It can effectively detect the surface and subsurface quality of aluminum plates, which is quite hard for the traditional piezoelectric technique. However, the deficiency of designing theories of...
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