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Design Method of Multiwavelength EMATs Based on Spatial Domain Harmonic Control.

Guofu Zhai, Yongqian Li, Yiren Qin

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |February 1, 2021
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    Summary

    This study introduces a novel design for multi-wavelength electromagnetic acoustic transducers (EMATs) using spatial-domain harmonic control. This advancement enhances defect assessment accuracy and broadens the application of EMATs in guided wave testing.

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    Area of Science:

    • Materials Science
    • Nondestructive Testing
    • Acoustics

    Background:

    • Conventional electromagnetic acoustic transducers (EMATs) generate single-wavelength guided waves, limiting their application scope and defect assessment accuracy.
    • The sensitivity of EMATs is wavelength-dependent, necessitating flexible solutions for diverse inspection needs.

    Purpose of the Study:

    • To propose a novel design method for multi-wavelength EMATs.
    • To enhance the accuracy and versatility of defect assessment using guided waves.
    • To enable the generation and detection of multiple wavelengths simultaneously with a single EMAT device.

    Main Methods:

    • Analysis of the EMAT model to understand the relationship between coil current density and eddy-current density.
    • Application of spatial-domain harmonic control and pulse modulation technology for coil parameter design.
    • Development of a design methodology based on spatial sampling of coil-current density.

    Main Results:

    • Demonstrated that multi-wavelength guided waves can be achieved by controlling the spatial distribution of coil-current density.
    • Successfully designed and validated a dual-wavelength EMAT for Lamb waves through simulation and experiments.
    • Confirmed the feasibility of designing multi-wavelength EMATs with an experiment involving a three-wavelength EMAT.

    Conclusions:

    • The proposed spatial-domain harmonic control method enables the design of multi-wavelength EMATs.
    • This approach significantly improves the potential for accurate defect assessment in various scenarios.
    • The developed technique offers a versatile platform for advanced guided wave testing applications.