Memorias de investigación
Conferencias:
Variational methods for inverse scattering problems
Año:2010
Áreas de investigación
  • Ingeniería aeronaútica
Datos
Descripción
Numerical methods based on the computation of topological derivatives are very powerful tools for inverse scattering problems associated with shape reconstruction and non{destructive testing. Recent work on topological derivatives focuses on problems where the nature of the scatterers is known. We address here the full problem, developing techniques to reconstruct objects buried in a medium and their physical properties. The medium and the objects are illuminated by an incident radiation (electromagnetic, thermal, acoustic). The total field, composed of incident, scattered and transmitted waves, satisfies a Helmholtz transmission problem in the plane. The inverse problem consists in reconstructing the objects and their material parameters from measurements of the total field at different locations. A weak reformulation as a constrained optimization problem is given. Our first step consists in developing a topological derivative based reconstruction scheme assuming that the properties of the objects are known. In a second step, we combine iterations to reconstruct the objects with gradient iterations to recover the material parameters. This strategy provides reasonable guesses of the parameter values, the number of scatterers, their location and size. Numerical experiments illustrate the accuracy of the method in different geometries.
Internacional
Si
ISSN o ISBN
No hay
Entidad relacionada
Universidad de Birmingham
Nacionalidad Entidad
REINO UNIDO
Lugar del congreso
Birmingham
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial