February  2010, 4(1): 131-149. doi: 10.3934/ipi.2010.4.131

Identification of sound-soft 3D obstacles from phaseless data

1. 

Institut für Numerische und Angewandte Mathematik, University of Göttingen, Lotzestr. 16-18, 37083, Göttingen, Germany

Received  May 2009 Revised  November 2009 Published  February 2010

The inverse problem for time-harmonic acoustic wave scattering to recover a sound-soft obstacle from a given incident field and the far field pattern of the scattered field is considered. We split this problem into two subproblems; first to reconstruct the shape from the modulus of the data and this is followed by employing the full far field pattern in a few measurement points to find the location of the obstacle. We extend a nonlinear integral equation approach for shape reconstruction from the modulus of the far field data [6] to the three-dimensional case. It is known, see [13], that the location of the obstacle cannot be reconstructed from only the modulus of the far field pattern since it is invariant under translations. However, employing the underlying invariance relation and using only few far field measurements in the backscattering direction we propose a novel approach for the localization of the obstacle. The efficient implementation of the method is described and the feasibility of the approach is illustrated by numerical examples.
Citation: Olha Ivanyshyn, Rainer Kress. Identification of sound-soft 3D obstacles from phaseless data. Inverse Problems and Imaging, 2010, 4 (1) : 131-149. doi: 10.3934/ipi.2010.4.131
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