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A method for calibrating hydrophones immersed in sandy sediment

A method for calibrating hydrophones immersed in sandy sediment
A method for calibrating hydrophones immersed in sandy sediment
Hydrophones are frequently used as receivers for in situ sediment acoustic experiments. At present, processing techniques use receiver sensitivities measured from water-based calibrations. It is, however, accepted that the receive sensitivity will depend on the medium surrounding the hydrophone, particularly at frequencies close to the transducer's resonance frequency. To assess this affect, a series of calibrations were performed over the frequency range of 10 to 200 kHz on two types of hydrophones (with cylindrical and spherical elements) inserted into degassed sandy sediment. Sensitivities were measured using a modified three-transducer reciprocity technique, which uses a co-linear arrangement to allow the sediment attenuation to be omitted from the sensitivity calculation. The insertion of the hydrophones into the sediment reduced the measured receive sensitivities by a maximum value of 3.8 dB with respect to the equivalent water-based calibrations. The co-linear arrangement adopted allowed the transmission between the outer devices to be recorded with and without the central hydrophone present. Repeat measurements indicated that the sediment disturbance associated with the removal of the central hydrophone caused sensitivity differences of less than 1.2 dB, while the inclusion of the central hydrophone caused a shadowing effect which increased sensitivities by between 1.3 to 4.0 dB. ©2008 Acoustical Society of America
0001-4966
p.3347
Robb, Gary B.
4e68f901-1f98-4953-977b-cbfcbdb8bb1e
Hayman, Gary
e6dee9c3-cf2d-4c89-bb39-4a91612c6011
Theobald, Peter D.
d792ecb6-c2b9-4ab6-97dd-9894aee05ac5
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Robinson, Stephen P.
ff096bc4-4e1f-44ec-ae1d-d671208d1ae7
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Robb, Gary B.
4e68f901-1f98-4953-977b-cbfcbdb8bb1e
Hayman, Gary
e6dee9c3-cf2d-4c89-bb39-4a91612c6011
Theobald, Peter D.
d792ecb6-c2b9-4ab6-97dd-9894aee05ac5
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Robinson, Stephen P.
ff096bc4-4e1f-44ec-ae1d-d671208d1ae7
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9

Robb, Gary B., Hayman, Gary, Theobald, Peter D., Humphrey, Victor F., Robinson, Stephen P., Leighton, Timothy G., Dix, Justin K. and Best, Angus I. (2008) A method for calibrating hydrophones immersed in sandy sediment. Journal of the Acoustical Society of America, 123 (5), p.3347. (doi:10.1121/1.2933904).

Record type: Article

Abstract

Hydrophones are frequently used as receivers for in situ sediment acoustic experiments. At present, processing techniques use receiver sensitivities measured from water-based calibrations. It is, however, accepted that the receive sensitivity will depend on the medium surrounding the hydrophone, particularly at frequencies close to the transducer's resonance frequency. To assess this affect, a series of calibrations were performed over the frequency range of 10 to 200 kHz on two types of hydrophones (with cylindrical and spherical elements) inserted into degassed sandy sediment. Sensitivities were measured using a modified three-transducer reciprocity technique, which uses a co-linear arrangement to allow the sediment attenuation to be omitted from the sensitivity calculation. The insertion of the hydrophones into the sediment reduced the measured receive sensitivities by a maximum value of 3.8 dB with respect to the equivalent water-based calibrations. The co-linear arrangement adopted allowed the transmission between the outer devices to be recorded with and without the central hydrophone present. Repeat measurements indicated that the sediment disturbance associated with the removal of the central hydrophone caused sensitivity differences of less than 1.2 dB, while the inclusion of the central hydrophone caused a shadowing effect which increased sensitivities by between 1.3 to 4.0 dB. ©2008 Acoustical Society of America

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More information

Published date: May 2008
Organisations: Ocean and Earth Science, Fluid Dynamics & Acoustics Group, National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 57844
URI: https://eprints.soton.ac.uk/id/eprint/57844
ISSN: 0001-4966
PURE UUID: 78534764-5052-44ab-8b20-76440247e07e
ORCID for Victor F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 20 Aug 2008
Last modified: 14 Mar 2019 01:53

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Contributors

Author: Gary B. Robb
Author: Gary Hayman
Author: Peter D. Theobald
Author: Stephen P. Robinson
Author: Justin K. Dix
Author: Angus I. Best

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