A shadowgraph method for ocean acoustics |
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| Authors: | B J Uscinski B Pruin |
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| Institution: |
a Applied Physics Laboratory and Department of Electrical Engineering, University of Washington, Seattle, WA, USA
b Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK
c STN ATLAS Marine Electronics, Hamburg, Germany |
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| Abstract: | A knowledge of convection activity in the upper few hundred metres of the ocean is important in establishing ocean-atmosphere heat fluxes and in understanding large-scale water-circulation processes. The usual methods for investigating internal structures in the ocean have certain drawbacks. Lowering probes into the ocean can provide local information only, while towed arrays of sensors are cumbersome and expensive. An alternative acoustic method for revealing internal structures is proposed. It is based on the observed acoustic intensity only and does not rely on phase or travel times. For this reason it is really an acoustic shadowgraph. The method is explained and its successful use in a sea trial is reported. |
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