title: Topological imaging in bounded elastic media.
abstract: Detecting, imaging and sizing defects in a bounded elastic medium is still a difficult task, especially when access is complex. Adjoint methods simplify the task as they take advantage of prior information such as the geometry and material properties. However, they still reveal a number of important limitations. Artifacts observed on the conventional topological energy image result from wave interactions with the boundaries of the inspected medium. The paper describes a method for addressing these artifacts, which involves forward and adjoint fields specified in terms of the boundary conditions. Modified topological energies are then defined according to the type of analyzed flaw (open slit or inclusion). Comparison of the numerical results with the experimental data confirms the relevance of the approach.
authors.affiliation: CEA, Centre de Cadarache, 13108 Saint-Paul-Lez-Durance Cedex, France; Aix-Marseille Université, CNRS, Centrale Marseille, LMA, Marseille, France. Electronic address: emma.lubeigt@gmail.com.
authors.forename: Emma
authors.initials: E
authors.lastname: Lubeigt
authors.affiliation: Aix-Marseille Université, CNRS, Centrale Marseille, LMA, Marseille, France.
authors.forename: Serge
authors.initials: S
authors.lastname: Mensah
authors.affiliation: Aix-Marseille Université, CNRS, Centrale Marseille, LMA, Marseille, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Rakotonarivo
authors.affiliation: Aix-Marseille Université, CNRS, Centrale Marseille, LMA, Marseille, France.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Chaix
authors.affiliation: CEA, Centre de Cadarache, 13108 Saint-Paul-Lez-Durance Cedex, France.
authors.forename: François
authors.initials: F
authors.lastname: Baqué
authors.affiliation: CEA, Centre de Cadarache, 13108 Saint-Paul-Lez-Durance Cedex, France.
authors.forename: Gilles
authors.initials: G
authors.lastname: Gobillot
keywords: Adjoint method; Bounded elastic medium; Non-destructive evaluation; Topological energy; Ultrasonic imaging