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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Guided Wave Tomography Based on Full Waveform Inversion
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Guided Wave Tomography Based on Full Waveform Inversion

机译：基于全波形反演的导波层析成像

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摘要

In this paper, a guided wave tomography method based on full waveform inversion (FWI) is developed for accurate and high-resolution reconstruction of the remaining wall thickness in isotropic plates. The forward model is computed in the frequency domain by solving a full-wave equation in a two-dimensional (2-D) acoustic model, accounting for higher order effects such as diffractions and multiple scattering. Both numerical simulations and experiments were carried out to obtain the signals of a dispersive guided mode propagating through defects. The inversion was based on local optimization of a waveform misfit function between modeled and measured data, and was applied iteratively to discrete frequency components from low to high frequencies. The resulting wave velocity maps were then converted to thickness maps by the dispersion characteristics of selected guided modes. The results suggest that the FWI method is capable to reconstruct the thickness map of a irregularly shaped defect accurately on a 10-mm-thick plate with the thickness error within 0.5 mm.
机译：本文提出了一种基于全波形反演（FWI）的导波层析成像方法，可以精确，高分辨率地重建各向同性板中的剩余壁厚。通过求解二维（2-D）声学模型中的全波方程，可以在频域中计算前向模型，从而解决了诸如衍射和多重散射等高阶效应。进行了数值模拟和实验，以获得通过缺陷传播的色散导模信号。该反演基于模型和测量数据之间的波形失配函数的局部优化，并且被迭代地应用于从低频到高频的离散频率分量。然后，通过选定的引导模式的色散特性将所得的波速图转换为厚度图。结果表明FWI方法能够在厚度为10mm的板上准确地重建不规则形状的缺陷的厚度图，厚度误差在0.5mm之内。

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