arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1712.02604math.AP
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用远场数据反演弹性表面散射

Inverse elastic surface scattering with far-field data

Huaian Diao, Peijun Li, Xiaokai Yuan

摘要:

针对周期结构近场成像中的弹性表面散射反问题,提出了一种严格的数学模型和有效的计算方法。我们演示了如何通过使用更容易测量的远场数据来实现增强的分辨率。该表面被假定为弹性刚性平面的小而光滑的扰动。通过在表面上方放置具有较大质量密度的均匀且各向同性弹性介质的矩形板,可以从远场数据中利用更多的传播波模式,这有助于重建分辨率。该方法只需要一个单一的照明,从远-近(FtN)场数据转换开始,并利用转换后的场展开导出正问题的分析解,从而导出反问题的显式反演公式。此外,一个非线性校正方案的发展,以提高重建的精度。结果表明,该方法能够稳定地重建表面,分辨率由板的密度控制。

英文摘要:

A rigorous mathematical model and an efficient computational method are proposed to solving the inverse elastic surface scattering problem which arises from the near-field imaging of periodic structures. We demonstrate how an enhanced resolution can be achieved by using more easily measurable far-field data. The surface is assumed to be a small and smooth perturbation of an elastically rigid plane. By placing a rectangular slab of a homogeneous and isotropic elastic medium with larger mass density above the surface, more propagating wave modes can be utilized from the far-field data which contributes to the reconstruction resolution. Requiring only a single illumination, the method begins with the far-to-near (FtN) field data conversion and utilizes the transformed field expansion to derive an analytic solution for the direct problem, which leads to an explicit inversion formula for the inverse problem. Moreover, a nonlinear correction scheme is developed to improve the accuracy of the reconstruction. Results show that the proposed method is capable of stably reconstructing surfaces with resolution controlled by the slab's density.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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