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arXiv 2406.06129math.AP
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由全局粗糙表面进行直接和反散射

Direct and inverse acoustic scattering by global rough surfaces

Chengyu Wu, Jiaqinq Yang

AI总结:

本文研究了由全局粗糙表面引起的直接和反散射问题,通过积分方程方法建立直接问题的适定性,并证明了在固定频率下通过近场测量唯一确定无界粗糙表面、传输系数和波数的唯一性结果。

摘要:

本文研究了在无损耗介质中由无界穿透粗糙表面所引起的直接和反散射问题。考虑了传输系数μ≠1和μ=1两种情况,这两种情况在直接和反问题中分别带来了一定的困难。我们首先通过细致的分析利用积分方程方法建立了直接问题的适定性。然后我们仔细考虑了点源或超奇异点源作用下问题解的奇异性,其中给出了一个简单且新颖的视角用于奇性的推导。最后,证明了对于反问题,从界面上方一条线段上固定频率的近场测量中,可以唯一确定无界粗糙表面、传输系数和波数在下半平面中的唯一性结果。

英文摘要:

In this paper, we investigate on the direct and inverse scattering problem by an unbounded penetrable rough surface in a lossless medium. The cases that the transmission coefficient $μ\neq1$ and $μ=1$, which creates certain difficulties in the direct and inverse problem, respectively, are both considered. We first estalish the well-posedness of the direct problem using the integral equation method through an elaborate analysis. Then we carefully consider the singularity of the solutions to the problem with incident point source or hypersingular point source, where a simple and novel perspective is given for the derivation of the singularity. Finally, a global uniqueness result is proven for the inverse problem on the unique determination of the unbounded rough surface, the transmission coefficient and the wave number in the lower half plane from the measurements of the near field only on a line segment above the interface at a fixed frequency.

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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