Oceanic bubble population measurements using a buoy-deployed combination frequency technique
Oceanic bubble population measurements using a buoy-deployed combination frequency technique
This paper presents the results of using a combination frequency acoustic technique to measure the near-surface bubble population in the open sea. The combination frequency technique monitors the appearance of sum-and-difference signals generated by the nonlinear interaction of two sound fields: one, a high-frequency signal, scatters geometrically from the bubble, and the other, of much lower frequency, is used to excite the bubble into resonant pulsation. The text details the calibration of the apparatus necessary to relate the measured heights of the sum-and-difference terms to actual numbers of bubbles and describes the experimental procedure for the collection of the oceanic data. In total, six trials were performed over a one day period, each comprising ten “snapshots” of the local bubble population at ten discrete radii. This data was augmented with simultaneous video, slide, and dictaphone records of the state of the sea around the measurement position
400-410
Phelps, Andy D.
5bf38d15-9242-4102-843c-d40806bed5fc
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
1998
Phelps, Andy D.
5bf38d15-9242-4102-843c-d40806bed5fc
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Phelps, Andy D. and Leighton, Timothy G.
(1998)
Oceanic bubble population measurements using a buoy-deployed combination frequency technique.
IEEE Journal of Oceanic Engineering, 23 (4), .
(doi:10.1109/48.725234).
Abstract
This paper presents the results of using a combination frequency acoustic technique to measure the near-surface bubble population in the open sea. The combination frequency technique monitors the appearance of sum-and-difference signals generated by the nonlinear interaction of two sound fields: one, a high-frequency signal, scatters geometrically from the bubble, and the other, of much lower frequency, is used to excite the bubble into resonant pulsation. The text details the calibration of the apparatus necessary to relate the measured heights of the sum-and-difference terms to actual numbers of bubbles and describes the experimental procedure for the collection of the oceanic data. In total, six trials were performed over a one day period, each comprising ten “snapshots” of the local bubble population at ten discrete radii. This data was augmented with simultaneous video, slide, and dictaphone records of the state of the sea around the measurement position
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Published date: 1998
Organisations:
Acoustics Group
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Local EPrints ID: 349545
URI: http://eprints.soton.ac.uk/id/eprint/349545
ISSN: 0364-9059
PURE UUID: cf9de115-56bc-4371-9e1b-d7dbd2c4d796
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Last modified: 15 Mar 2024 02:45
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Andy D. Phelps
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