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IPI

We consider an inverse scattering problem arising in target identification.
We prove a local stability result of logarithmic type for the determination of a sound soft obstacle
from the far field measurements associated to one single incident wave.

IPI

In this paper, we investigate the problem of reconstructing sound-soft acoustic obstacles using multifrequency far field measurements corresponding to one direction of incidence. The idea is to obtain a rough estimate of the obstacle's shape at the lowest frequency using the least-squares approach, then refine it using a recursive linearization algorithm at higher frequencies. Using this approach, we show that an accurate reconstruction can be obtained without requiring a good initial guess. The analysis is divided into three steps. Firstly, we give a quantitative estimate of the domain in which the least-squares objective functional, at the lowest frequency, has only one extreme (minimum) point. This result enables us to obtain a rough approximation of the obstacle at the lowest frequency from initial guesses in this domain using convergent gradient-based iterative procedures. Secondly, we describe the recursive linearization algorithm and analyze its convergence for noisy data. We qualitatively explain the relationship between the noise level and the resolution limit of the reconstruction. Thirdly, we justify a conditional asymptotic Hölder stability estimate of the illuminated part of the obstacle at high frequencies. The performance of the algorithm is illustrated with numerical examples.

IPI

In this work, we are concerned with the inverse scattering by obstacles for the linearized, homogeneous and isotropic elastic model.
We study the uniqueness issue of detecting smooth obstacles
from the knowledge of elastic far field patterns. We prove that the
'pressure' parts of the far field patterns over all directions of measurements
corresponding to all 'pressure' (or all 'shear') incident plane waves are
enough to guarantee uniqueness. We also establish that the shear parts of
the far field patterns corresponding to all the 'shear' (or all 'pressure') incident
waves are also enough. This shows that any of the two different types of
waves is enough to detect obstacles at a fixed frequency. The proof is reconstructive and it can be used to set up an algorithm
to detect the obstacle from the mentioned data.

IPI

The interior transmission problem appears naturally in the
scattering theory. In this paper, we construct the
Green function associated to this problem. In addition, we provide
point-wise estimates of this Green function similar to those known
for the Green function related to the classical transmission
problems. These estimates are, in particular, useful to the study of
various inverse scattering problems. Here, we apply them to
justify some asymptotic formulas already used for detecting
partially coated dielectric mediums from far field measurements.

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