Use of Interference Patterns to Control Sound Field Focusing in Shallow Water

Author:

Pereselkov Sergey1ORCID,Kuz’kin Venedikt2ORCID,Ehrhardt Matthias3ORCID,Tkachenko Sergey1ORCID,Rybyanets Pavel1ORCID,Ladykin Nikolay1ORCID

Affiliation:

1. Mathematical Physics and Information Technology Department, Voronezh State University, 394018 Voronezh, Russia

2. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia

3. Department of Mathematics and Informatics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany

Abstract

The possibility of controlling localized fields in multimode shallow water waveguides based on the principle of interference invariance was studied. Within the framework of the numerical experiments in a wide frequency range of 100–350 Hz and range intervals of 10–100 km, the possibilities of focusing the sound field by wavefront reversal and controlling of the focusing of the focal spot by frequency tuning in shallow water waveguides was analyzed. The focal spot scanning was carried out by frequency tuning with a fixed distribution of the sound field at receiving and transmitting vertical antenna apertures. A comparative analysis of the features of focusing and focal spot control for summer and winter stratification of the water layer was carried out. It is shown that the parameters of the focal spot during frequency tuning were more stable in the winter waveguide. It is demonstrated that the sound frequency tuning had a piecewise continuous character and was carried out on a domain of one continuous track and jump-passing on the other track in accordance with the waveguide interference fringes in the range–frequency domain.

Funder

Ministry of Education and Science of the Russian Federation

President of the Russian Federation

Publisher

MDPI AG

Subject

Ocean Engineering,Water Science and Technology,Civil and Structural Engineering

Reference29 articles.

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