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Measurement of viscous sound absorption at 50-150 kHz in a model turbid environment

Measurement of viscous sound absorption at 50-150 kHz in a model turbid environment
Measurement of viscous sound absorption at 50-150 kHz in a model turbid environment
The visco-thermal absorption of sound by suspended particulate matter can be reliably measured using a reverberation technique. This absorption may have an adverse effect on the performance of sonars operating at 50–300 kHz in coastal waters where suspensions are often present in significant concentrations. A series of experiments has been performed to study the viscous absorption by suspensions in the frequency range of 50–150 kHz. In the test volumes employed, the effect is small. It is therefore measured by taking the difference in reverberation times of a volume of water with and without particles. This greatly reduces the effect on the measurement of the other sources of absorption. Even so, it is necessary to design the experiment to characterize and minimize acoustic losses which occur at the surfaces of the container, the hydrophones, and their cables, and losses associated with bubbles and turbulence. These effects are discussed and results for particulate absorption for suspensions of spherical glass beads are presented and compared to theoretical predictions. Measured absorption agrees well with that predicted by theory for concentrations above 0.5 kg/m3 and up to 2.0 kg/m3
0001-4966
2114-2120
Brown, Niven R.
c6d1f5cf-f25c-4a09-a79b-af5110c1248d
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Richards, Simon D.
18888d3d-677a-4643-a100-74914a5ae319
Heathershaw, Anthony D.
7bf0f2f7-1970-4ab4-a5cf-4b3192edd765
Brown, Niven R.
c6d1f5cf-f25c-4a09-a79b-af5110c1248d
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Richards, Simon D.
18888d3d-677a-4643-a100-74914a5ae319
Heathershaw, Anthony D.
7bf0f2f7-1970-4ab4-a5cf-4b3192edd765

Brown, Niven R., Leighton, Timothy G., Richards, Simon D. and Heathershaw, Anthony D. (1998) Measurement of viscous sound absorption at 50-150 kHz in a model turbid environment. Journal of the Acoustical Society of America, 104 (4), 2114-2120. (doi:10.1121/1.423725).

Record type: Article

Abstract

The visco-thermal absorption of sound by suspended particulate matter can be reliably measured using a reverberation technique. This absorption may have an adverse effect on the performance of sonars operating at 50–300 kHz in coastal waters where suspensions are often present in significant concentrations. A series of experiments has been performed to study the viscous absorption by suspensions in the frequency range of 50–150 kHz. In the test volumes employed, the effect is small. It is therefore measured by taking the difference in reverberation times of a volume of water with and without particles. This greatly reduces the effect on the measurement of the other sources of absorption. Even so, it is necessary to design the experiment to characterize and minimize acoustic losses which occur at the surfaces of the container, the hydrophones, and their cables, and losses associated with bubbles and turbulence. These effects are discussed and results for particulate absorption for suspensions of spherical glass beads are presented and compared to theoretical predictions. Measured absorption agrees well with that predicted by theory for concentrations above 0.5 kg/m3 and up to 2.0 kg/m3

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Published date: 1998
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 349542
URI: https://eprints.soton.ac.uk/id/eprint/349542
ISSN: 0001-4966
PURE UUID: 05b37608-19e9-43c9-aea1-c570b9f3922b
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 07 Mar 2013 14:18
Last modified: 06 Jun 2018 13:08

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