Sub-wavelength focusing of acoustic waves in bubbly media

Author:

Ammari Habib1ORCID,Fitzpatrick Brian1,Gontier David2,Lee Hyundae3,Zhang Hai4

Affiliation:

1. Department of Mathematics, ETH Zürich, Rämistrasse 101, 8092 Zürich, Switzerland

2. CEREMADE, Université Paris-Dauphine, Place du Maréchal de Lattre de Tassigny, 75775 Paris Cedex 16, France

3. Department of Mathematics, Inha University, 253 Yonghyun-dong Nam-gu, Incheon 402-751, South Korea

4. Department of Mathematics, HKUST, Clear Water Bay, Kowloon, Hong Kong

Abstract

The purpose of this paper is to investigate acoustic wave scattering by a large number of bubbles in a liquid at frequencies near the Minnaert resonance frequency. This bubbly media has been exploited in practice to obtain super-focusing of acoustic waves. Using layer potential techniques, we derive the scattering function for a single spherical bubble excited by an incident wave in the low frequency regime. We then propose a point scatterer approximation for N bubbles, and describe several numerical simulations based on this approximation, that demonstrate the possibility of achieving super-focusing using bubbly media.

Funder

NRF-Korea

Hong Kong University of Science and Technology

HK RGC

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

Reference24 articles.

1. XVI.On musical air-bubbles and the sounds of running water

2. Mathematical and Statistical Methods for Multistatic Imaging

3. Subwavelength focusing in bubbly media using broadband time reversal

4. Layer Potential Techniques in Spectral Analysis

5. Ammari H Gontier D Fitzpatrick B Lee H Zhang H. 2016 Minnaert resonances for acoustic waves in bubbly media. (http://arxiv.org/abs/1603.03982)

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