Optical studies of acoustic fields
Optical studies of acoustic fields
Obtaining detailed views of complex acoustic and ultrasonic fields is made difficult by the need to use hydrophones and mechanically scan these through the field. The use of optical techniques to measure fields has several advantages: a hydrophone, that can perturb the field, is not required and an optical beam can potentially be scanned much faster than a physical device. Three different optical techniques for measuring fields will be considered, two of which exploit the acousto-optic effect. The first approach is the use of conventional schlieren techniques, which will be illustrated with examples of ultrasound scattering from structures and the observation of resonances in cylindrical shells. This approach is easily extended to more complex situations such as the chaotic fields of a stadium cavity. More recently the availability of Laser Doppler Vibrometers (LDVs) has enabled the fields of ultrasonic transducers to be studied by tomographic techniques or by measuring the surface vibration of the transducer and numerically predicting the field based on the surface velocity. A range of resulting images will be used to illustrate the performance of these various approaches to the optical measurement of ultrasonic fields.
Acoustical Society of America
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Humphrey, Victor F.
(2021)
Optical studies of acoustic fields.
In International Conference on Underwater Acoustics 2020.
vol. 40,
Acoustical Society of America.
12 pp
.
(doi:10.1121/2.0001343).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Obtaining detailed views of complex acoustic and ultrasonic fields is made difficult by the need to use hydrophones and mechanically scan these through the field. The use of optical techniques to measure fields has several advantages: a hydrophone, that can perturb the field, is not required and an optical beam can potentially be scanned much faster than a physical device. Three different optical techniques for measuring fields will be considered, two of which exploit the acousto-optic effect. The first approach is the use of conventional schlieren techniques, which will be illustrated with examples of ultrasound scattering from structures and the observation of resonances in cylindrical shells. This approach is easily extended to more complex situations such as the chaotic fields of a stadium cavity. More recently the availability of Laser Doppler Vibrometers (LDVs) has enabled the fields of ultrasonic transducers to be studied by tomographic techniques or by measuring the surface vibration of the transducer and numerically predicting the field based on the surface velocity. A range of resulting images will be used to illustrate the performance of these various approaches to the optical measurement of ultrasonic fields.
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e-pub ahead of print date: 1 February 2021
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Funding Information:
The author would like to acknowledge all those who have contributed to obtaining the results shown, Stephen Robinson and Pete Theobald at the National Physical Laboratory, Paul Chinnery, Sharon Knapp, Carolyn Beckett and Martin Cooling. The author also wishes to acknowledge the support of the National Physical Laboratory, the Department for Business, Energy & Industrial Strategy and its predecessors, and the Ministry of Defence.
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© 2021 Acoustical Society of America.
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Local EPrints ID: 446436
URI: http://eprints.soton.ac.uk/id/eprint/446436
ISSN: 1939-800X
PURE UUID: 06b42bed-a206-488e-8bd7-75d2ab1d3662
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Date deposited: 09 Feb 2021 17:32
Last modified: 17 Mar 2024 02:57
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