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The uniqueness of the inverse elastic wave scattering problem based on the mixed reciprocity relation

  • * Corresponding author: Guozheng Yan

    * Corresponding author: Guozheng Yan
The first author is supported by the Innovative Funding Project from Central China Normal University (Grant No. 2019CXZZ078). The second author is supported by the National Natural Science Foundation of China (Grant No. 11571132)
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  • This paper considers the inverse elastic wave scattering by a bounded penetrable or impenetrable scatterer. We propose a novel technique to show that the elastic obstacle can be uniquely determined by its far-field pattern associated with all incident plane waves at a fixed frequency. In the first part of this paper, we establish the mixed reciprocity relation between the far-field pattern corresponding to special point sources and the scattered field corresponding to plane waves, and the mixed reciprocity relation is the key point to show the uniqueness results. In the second part, besides the mixed reciprocity relation, a priori estimates of solution to the transmission problem with boundary data in $ [L^{\mathrm{q}}(\partial\Omega)]^{3} $ ($ 1<\mathrm{q}<2 $) is deeply investigated by the integral equation method and also we have constructed a well-posed modified static interior transmission problem on a small domain to obtain the uniqueness result.

    Mathematics Subject Classification: Primary: 31B10, 35J25, 74B05, 74J25; Secondary: 45Q05.


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  • Figure 1.  Possible choice of $ x^{*} $

    Figure 2.  Possible choice of $ x^{*} $

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