Finite element analysis of EMAT using comsol multiphysics

Thomas, Sadiq; Muazu, Hassan; Zarma, Tahir Aja; Galadima, Ahmadu A.

doi:10.1109/icecco.2017.8333338

Cited by 1 publication

(1 citation statement)

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“…In a distributions of Lorentz force and the acoustic field are quite similar w geometry [38]. In addition, this model was established using common modeling methods [40,41]. The permanent magnet material was NdFeB, and all the material characteristics in this model were taken from COMSOL.…”

Section: Simulation Resultsmentioning

confidence: 99%

A New Design to Rayleigh Wave EMAT Based on Spatial Pulse Compression

Jiang

Zhang

et al. 2023

Sensors

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The main disadvantage of the electromagnetic acoustic transducer (EMAT) is low energy-conversion efficiency and low signal-to-noise ratio (SNR). This problem can be improved by pulse compression technology in the time domain. In this paper, a new coil structure with unequal spacing was proposed for a Rayleigh wave EMAT (RW-EMAT) to replace the conventional meander line coil with equal spacing, which allows the signal to be compressed in the spatial domain. Linear and nonlinear wavelength modulations were analyzed to design the unequal spacing coil. Based on this, the performance of the new coil structure was analyzed by the autocorrelation function. Finite element simulation and experiments proved the feasibility of the spatial pulse compression coil. The experimental results show that the received signal amplitude is increased by 2.3~2.6 times, the signal with a width of 20 μs could be compressed into a δ-like pulse of less than 0.25 μs and the SNR is increased by 7.1–10.1 dB. These indicate that the proposed new RW-EMAT can effectively enhance the strength, time resolution and SNR of the received signal.

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Section: Simulation Resultsmentioning

confidence: 99%