Abstract
For forward and inverse Helmholtz problems with inhomogeneity in the 2-D setting, high-order topological analysis is provided based on singular perturbations and variational methods. When diminishing the inhomogeneity, the two-parameter asymptotic result is proved rigorously with respect to the size of inhomogeneity and its refractive index. In particular, for a fixed refractive index this implies the topological derivative. For identifying an unknown inhomogeneity put in a test domain, variation of a complex refractive index leads to the zero-order necessary optimality condition of minimum of the objective function. This condition is realized as an imaging function for finding center of the inhomogeneity.
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Acknowledgments
The results were obtained with the support of the Austrian Science Fund (FWF) project P26147-N26: “Object identification problems: numerical analysis” (PION), partial support of NAWI Graz, the Austrian Academy of Sciences (OeAW), and OeAD Scientific & Technological Cooperation (WTZ CZ 01/2016). The author thanks for invitation Organizers of the International Conference CoMFoS15: Mathematical Analysis of Continuum Mechanics and Industrial Applications, 16-18.11.2015, Kyushu University, Fukuoka, Japan.
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Kovtunenko, V.A. (2017). Two-Parameter Topological Expansion of Helmholtz Problems with Inhomogeneity. In: Itou, H., Kimura, M., Chalupecký, V., Ohtsuka, K., Tagami, D., Takada, A. (eds) Mathematical Analysis of Continuum Mechanics and Industrial Applications. Mathematics for Industry, vol 26. Springer, Singapore. https://doi.org/10.1007/978-981-10-2633-1_5
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