Probe method and a Carleman function

Details Probe method and a Carleman function Probe method and a Carleman function

2007-01-04

arxiv.org/abs/math/0701126v1

Inverse Problems, 23(2007), 1871-1894

Mathematics

Analysis of PDEs

Scientific paper

10.1088/0266-5611/23/5/006

A Carleman function is a special fundamental solution with a large parameter for the Laplace operator and gives a formula to calculate the value of the solution of the Cauchy problem in a domain for the Laplace equation. The probe method applied to an inverse boundary value problem for the Laplace equation in a bounded domain is based on the existence of a special sequence of harmonic functions which is called a {\it needle sequence}. The needle sequence blows up on a special curve which connects a given point inside the domain with a point on the boundary of the domain and is convergent locally outside the curve. The sequence yields a reconstruction formula of unknown discontinuity, such as cavity, inclusion in a given medium from the Dirichlet-to-Neumann map. In this paper an explicit needle sequence in {\it three dimensions} is given in a closed-form. It is an application of a Carleman function introduced by Yarmukhamedov. Furthermore, an explicit needle sequence in the probe method applied to the reduction of inverse obstacle scattering problems with an {\it arbitrary} fixed wave number to inverse boundary value problems for the Helmholtz equation is also given.

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