Experimental Demonstration of Underwater Acoustic Scattering Cancellation

We explore an acoustic scattering cancellation shell for buoyant hollow cylinders submersed in a water background. A thin, low-shear, elastic coating is used to cancel the monopole scattering from an air-filled, neutrally buoyant steel shell for all frequencies where the wavelength is larger than th...

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Main Authors:	Rohde, Charles A., Martin, Theodore P., Guild, Matthew D., Layman, Christopher N., Naify, Christina J., Nicholas, Michael, Thangawng, Abel L., Calvo, David C., Orris, Gregory J.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4539548/

id	pubmed-4539548
recordtype	oai_dc
spelling	pubmed-45395482015-08-26 Experimental Demonstration of Underwater Acoustic Scattering Cancellation Rohde, Charles A. Martin, Theodore P. Guild, Matthew D. Layman, Christopher N. Naify, Christina J. Nicholas, Michael Thangawng, Abel L. Calvo, David C. Orris, Gregory J. Article We explore an acoustic scattering cancellation shell for buoyant hollow cylinders submersed in a water background. A thin, low-shear, elastic coating is used to cancel the monopole scattering from an air-filled, neutrally buoyant steel shell for all frequencies where the wavelength is larger than the object diameter. By design, the uncoated shell also has an effective density close to the aqueous background, independently canceling its dipole scattering. Due to the significantly reduced monopole and dipole scattering, the compliant coating results in a hollow cylindrical inclusion that is simultaneously impedance and sound speed matched to the water background. We demonstrate the proposed cancellation method with a specific case, using an array of hollow steel cylinders coated with thin silicone rubber shells. These experimental results are matched to finite element modeling predictions, confirming the scattering reduction. Additional calculations explore the optimization of the silicone coating properties. Using this approach, it is found that scattering cross-sections can be reduced by 20 dB for all wavelengths up to k0a = 0.85. Nature Publishing Group 2015-08-18 /pmc/articles/PMC4539548/ /pubmed/26282067 http://dx.doi.org/10.1038/srep13175 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Rohde, Charles A. Martin, Theodore P. Guild, Matthew D. Layman, Christopher N. Naify, Christina J. Nicholas, Michael Thangawng, Abel L. Calvo, David C. Orris, Gregory J.
spellingShingle	Rohde, Charles A. Martin, Theodore P. Guild, Matthew D. Layman, Christopher N. Naify, Christina J. Nicholas, Michael Thangawng, Abel L. Calvo, David C. Orris, Gregory J. Experimental Demonstration of Underwater Acoustic Scattering Cancellation
author_facet	Rohde, Charles A. Martin, Theodore P. Guild, Matthew D. Layman, Christopher N. Naify, Christina J. Nicholas, Michael Thangawng, Abel L. Calvo, David C. Orris, Gregory J.
author_sort	Rohde, Charles A.
title	Experimental Demonstration of Underwater Acoustic Scattering Cancellation
title_short	Experimental Demonstration of Underwater Acoustic Scattering Cancellation
title_full	Experimental Demonstration of Underwater Acoustic Scattering Cancellation
title_fullStr	Experimental Demonstration of Underwater Acoustic Scattering Cancellation
title_full_unstemmed	Experimental Demonstration of Underwater Acoustic Scattering Cancellation
title_sort	experimental demonstration of underwater acoustic scattering cancellation
description	We explore an acoustic scattering cancellation shell for buoyant hollow cylinders submersed in a water background. A thin, low-shear, elastic coating is used to cancel the monopole scattering from an air-filled, neutrally buoyant steel shell for all frequencies where the wavelength is larger than the object diameter. By design, the uncoated shell also has an effective density close to the aqueous background, independently canceling its dipole scattering. Due to the significantly reduced monopole and dipole scattering, the compliant coating results in a hollow cylindrical inclusion that is simultaneously impedance and sound speed matched to the water background. We demonstrate the proposed cancellation method with a specific case, using an array of hollow steel cylinders coated with thin silicone rubber shells. These experimental results are matched to finite element modeling predictions, confirming the scattering reduction. Additional calculations explore the optimization of the silicone coating properties. Using this approach, it is found that scattering cross-sections can be reduced by 20 dB for all wavelengths up to k0a = 0.85.
publisher	Nature Publishing Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4539548/
_version_	1613260639206113280

Experimental Demonstration of Underwater Acoustic Scattering Cancellation

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