The influence of the acousto-optic effect on LDV measurements of underwater transducer vibration and resultant field predictions
The influence of the acousto-optic effect on LDV measurements of underwater transducer vibration and resultant field predictions
A scanning Laser Doppler Vibrometer (LDV) provides a potential method of measuring the surface velocity of an immersed underwater transducer. Scanning the laser beam across a transducer in this way has the potential to be a fast, non-invasive method for source characterisation and, in turn, field prediction. Such measurements are, however, significantly complicated by the acousto-optic interaction – that is, the effect on the measurements of the acoustic field through which the laser beam passes. A detailed simulation of the LDV measurement of a circular, plane piston transducer emitting a toneburst has been created. This use of a transient pressure field is important both for simulation and experiment, such that measurements can be made over a time window which ends before any acoustic signal reaches the water tank boundaries. The simulation results show a significant acousto-optic artefact contribution to the surface velocity data, but also that for some applications useful field predictions may be made in spite of this. To complement the simulations, experimental measurements have been made using a commercial LDV (Polytec PSV-400) on 500 kHz circular transducers.
laser doppler vibrometer, acousto-optic interaction, calibration
Cooling, M.P.
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Humphrey, V.F.
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Theobald, P.D.
236fc379-85f5-405f-9994-f9b07b14b8fa
Robinson, S.P.
00d341a1-6153-45db-bda4-666928a652e5
June 2011
Cooling, M.P.
caf6c2e0-c385-4f8c-bec6-7dd0473f65af
Humphrey, V.F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Theobald, P.D.
236fc379-85f5-405f-9994-f9b07b14b8fa
Robinson, S.P.
00d341a1-6153-45db-bda4-666928a652e5
Cooling, M.P., Humphrey, V.F., Theobald, P.D. and Robinson, S.P.
(2011)
The influence of the acousto-optic effect on LDV measurements of underwater transducer vibration and resultant field predictions.
Fourth International Conference on Underwater Acoustic Measurements, Technologies and Results, Kos, Greece.
19 - 23 Jun 2011.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A scanning Laser Doppler Vibrometer (LDV) provides a potential method of measuring the surface velocity of an immersed underwater transducer. Scanning the laser beam across a transducer in this way has the potential to be a fast, non-invasive method for source characterisation and, in turn, field prediction. Such measurements are, however, significantly complicated by the acousto-optic interaction – that is, the effect on the measurements of the acoustic field through which the laser beam passes. A detailed simulation of the LDV measurement of a circular, plane piston transducer emitting a toneburst has been created. This use of a transient pressure field is important both for simulation and experiment, such that measurements can be made over a time window which ends before any acoustic signal reaches the water tank boundaries. The simulation results show a significant acousto-optic artefact contribution to the surface velocity data, but also that for some applications useful field predictions may be made in spite of this. To complement the simulations, experimental measurements have been made using a commercial LDV (Polytec PSV-400) on 500 kHz circular transducers.
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More information
Published date: June 2011
Additional Information:
Page 619-626 of the proceedings made available to all registered participants on the first day of the conference.
Venue - Dates:
Fourth International Conference on Underwater Acoustic Measurements, Technologies and Results, Kos, Greece, 2011-06-19 - 2011-06-23
Keywords:
laser doppler vibrometer, acousto-optic interaction, calibration
Organisations:
Acoustics Group
Identifiers
Local EPrints ID: 195855
URI: http://eprints.soton.ac.uk/id/eprint/195855
PURE UUID: 84482f9b-c345-43c0-9f2b-34794092b785
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Date deposited: 31 Aug 2011 08:37
Last modified: 11 Dec 2021 03:54
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Contributors
Author:
M.P. Cooling
Author:
P.D. Theobald
Author:
S.P. Robinson
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