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The linear sampling method in a waveguide: A modal formulation

Laurent Bourgeois 1 Éric Lunéville 1 
1 POEMS - Propagation des Ondes : Étude Mathématique et Simulation
Inria Saclay - Ile de France, UMA - Unité de Mathématiques Appliquées, CNRS - Centre National de la Recherche Scientifique : UMR7231
Abstract : This paper concerns the linear sampling method used to retrieve obstacles in a 2D or 3D acoustic waveguide. The classical mathematical results concerning the identifiability of the obstacle and the justification of the inverse method are established for this particular geometry. Our main concern is to derive a modal formulation of the linear sampling method that is well adapted to the waveguide configuration. In particular, thanks to such formulation, we highlight the fact that finding some obstacles from remote scattering data is more delicate in a waveguide than in free space. Indeed, the presence of evanescent modes increases the ill posedness of the inverse problem. However, we show that the numerical reconstruction of obstacles by using the far field is feasible, even by using a few incident waves. © 2008 IOP Publishing Ltd.
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Submitted on : Thursday, October 24, 2013 - 10:46:10 AM
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Laurent Bourgeois, Éric Lunéville. The linear sampling method in a waveguide: A modal formulation. Inverse Problems, IOP Publishing, 2008, 24 (1), ⟨10.1088/0266-5611/24/1/015018⟩. ⟨hal-00876221⟩



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