On an inverse elastic wave imaging scheme for nearly incompressible materials

On an inverse elastic wave imaging scheme for nearly incompressible materials
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近不可压缩材料的逆弹性波成像方案

DOI:
10.1093/imamat/hxy056
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发表时间:
2017-11
影响因子:
1.2
通讯作者:
Sun Hongpeng
Sun Hongpeng
中科院分区:
数学4区
文献类型:
--
作者:
Li Jingzhi;Liu Hongyu;Sun Hongpeng

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本文致力于逆弹性散射问题的算法开发。我们专注于利用几乎不可压缩材料的已知字典数据重建弹性散射体的位置和形状。散射体包括不可穿透的刚性障碍物和可穿透的介质,我们使用时谐弹性点信号作为入射输入波。散射波被收集在有界表面上相对较小的反向散射孔径中。提出了一种两阶段重建算法,仅需要两个不同波数的入射波。首先利用小波数下的测量数据来近似定位未知散射体,然后通过计算出的散射体位置以及规则波数下的测量数据来确定散射体的形状。并给出了相应的数学原理并进行了严格的分析。数值测试说明了该方法的有效性和效率。
This paper is devoted to the algorithmic development of inverse elastic scattering problems. We focus on reconstructing the locations and shapes of elastic scatterers with known dictionary data for the nearly incompressible materials. The scatterers include non-penetrable rigid obstacles and penetrable mediums, and we use time-harmonic elastic point signals as the incident input waves. The scattered waves are collected in a relatively small backscattering aperture on a bounded surface. A two-stage algorithm is proposed for the reconstruction and only two incident waves of different wavenumbers are required. The unknown scatterer is first approximately located by using the measured data at a small wavenumber, and then the shape of the scatterer is determined by the computed location of the scatterer together with the measured data at a regular wavenumber. The corresponding mathematical principle with rigorous analysis is presented. Numerical tests illustrate the effectiveness and efficiency of the proposed method.
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