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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

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Excitation of a layered sphere by $N$ acoustic sources: Exact solutions, low-frequency approximations, and inverse problems


Authors: Andreas Kalogeropoulos and Nikolaos L. Tsitsas
Journal: Quart. Appl. Math. 81 (2023), 141-173
MSC (2020): Primary 74J20, 35P25, 78A48, 78A46
DOI: https://doi.org/10.1090/qam/1632
Published electronically: October 18, 2022
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Abstract: Acoustic excitation of a layered sphere by $N$ external and internal point sources is considered. The direct problem is solved by developing a T-Matrix method leading to the analytical determination of all the involved acoustic fields. Low-frequency far-field approximations are derived for different source distributions and scatterer’s characteristics. The behaviour of the scattering cross sections is investigated. Several inverse problems are formulated and solved analytically; thus the respective unknown quantities are recovered explicitly. These problems include localization of the sources, determination of their number, identification of the core’s type and extraction of the parameters of the scatterer’s layers.


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Additional Information

Andreas Kalogeropoulos
Affiliation: School of Informatics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
MR Author ID: 1434482
ORCID: 0000-0001-6526-5606
Email: akaloger@csd.auth.gr

Nikolaos L. Tsitsas
Affiliation: School of Informatics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
MR Author ID: 779168
ORCID: 0000-0003-1409-2631
Email: ntsitsas@csd.auth.gr

Keywords: Acoustic waves, scattering, layered sphere, point sources, cross sections, inverse problems
Received by editor(s): July 13, 2022
Received by editor(s) in revised form: August 22, 2022
Published electronically: October 18, 2022
Additional Notes: The first author was co-financed by Greece and the European Union (European Social Fund) through the Operational Program “Human Resource Development, Education and Lifelong Learning”, 2014–2020, in the context of the Action “Strengthening human resources through the implementation of Ph.D. Research Sub-Action 2: IKY Scholarship Program for Ph.D. Candidates at Greek Universities”
Article copyright: © Copyright 2022 Brown University