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An efficient wavenumber algorithm towards real-time ultrasonic full-matrix imaging of multi-layered medium

机译：多层介质实时超声全矩阵成像的高效波数算法

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摘要

Ultrasonic full-matrix imaging can sense small defects in non-destructive evaluation using full-matrix capture (FMC). However, the accompanying heavy computational burden limits FMC's applications, especially for real-time scenarios. Currently, the full-matrix imaging for homogeneous medium has progressively advanced, but these algorithms become inaccurate and inefficient for the multi-layered medium. To overcome this problem, an efficient wavenumber algorithm for ultrasonic full-matrix imaging of multi-layered medium is proposed in this paper. The proposed method utilises wavefield extrapolation to migrate the transmitting and receiving transducers virtually to the interfaces between different layers. It then reconstructs the image of each layer with Stolt interpolation. The proposed method is developed based on a wave model, and thus is more rigorous than the ray-based theory in mathematics. Moreover, the calculation in the wavenumber domain dramatically reduces the computational cost. In comparison with well-established root-mean-square-based total focusing method and extended phase shift migration, the proposed method performed better in terms of imaging quality and efficiency in the simulations and experiments. Specifically, it achieves 6-10 Hz imaging frame rates for ultrasonic full-matrix imaging of multi-layered medium using a 64-element phased array, and may find various real-time imaging applications in practice.
机译：超声波全矩阵成像可以使用全矩阵捕获（FMC）感测非破坏性评估中的小缺陷。然而，随附的繁重计算负担限制了FMC的应用，特别是对于实时方案。目前，对多层介质的全矩阵成像已经逐步推进，但是对于多层介质，这些算法变得不准确和低效。为了克服该问题，本文提出了一种用于多层介质的超声全矩阵成像的高效波数算法。所提出的方法利用波场外推，几乎迁移到不同层之间的接口的传输和接收换能器。然后，它用Stolt插值重建每个层的图像。所提出的方法是基于波模型开发的，因此比数学中的基于射线理论更加严格。此外，波数域的计算显着降低了计算成本。与基于良好的基于​​根均线的总聚焦方法和扩展相移迁移相比，所提出的方法在模拟和实验中的成像质量和效率方面更好地执行。具体地，它使用64元件相控阵列实现了用于多层介质的超声全矩阵成像的6-10 Hz成像帧速率，并且可以在实践中找到各种实时成像应用。

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