Identification of small inhomogeneities: Asymptotic factorization

Ammari, Habib; Griesmaier, Roland; Hanke, Martin

doi:10.1090/S0025-5718-07-01946-1

Identification of small inhomogeneities: Asymptotic factorization
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by Habib Ammari, Roland Griesmaier and Martin Hanke PDF

Math. Comp. 76 (2007), 1425-1448 Request permission

Abstract:

We consider the boundary value problem of calculating the electrostatic potential for a homogeneous conductor containing finitely many small insulating inclusions. We give a new proof of the asymptotic expansion of the electrostatic potential in terms of the background potential, the location of the inhomogeneities and their geometry, as the size of the inhomogeneities tends to zero. Such asymptotic expansions have already been used to design direct (i.e. noniterative) reconstruction algorithms for the determination of the location of the small inclusions from electrostatic measurements on the boundary, e.g. MUSIC-type methods. Our derivation of the asymptotic formulas is based on integral equation methods. It demonstrates the strong relation between factorization methods and MUSIC-type methods for the solution of this inverse problem.

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