Direct sampling for recovering a clamped cavity from biharmonic far field data

TL;DR

This paper extends direct sampling methods to biharmonic wave equations for recovering unknown cavities in plates using far-field data, demonstrating effectiveness through analysis and numerical examples.

Contribution

First extension of direct sampling methods to biharmonic waves with far-field data for inverse shape problems.

Findings

Imaging functions are effective for cavity recovery.

Analysis confirms applicability of acoustic inverse shape techniques.

Numerical results validate the method's accuracy.

Abstract

This paper concerns the inverse shape problem of recovering an unknown clamped cavity embedded in a thin infinite plate. The model problem is assumed to be governed by the two-dimensional biharmonic wave equation in the frequency domain. Based on the far-field data, a resolution analysis is conducted for cavity recovery via the direct sampling method. The Funk--Hecke integral identity is employed to analyze the performance of two imaging functions. Our analysis demonstrates that the same imaging functions commonly used for acoustic inverse shape problems are applicable to the biharmonic wave context. This work presents the first extension of direct sampling methods to biharmonic waves using far-field data. Numerical examples are provided to illustrate the effectiveness of these imaging functions in recovering a clamped cavity.