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Effects of transducer geometry and beam spreading on acoustic Doppler velocity measurements near boundaries

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2 Author(s)
Vadim Polonichko ; SonTek/YSI, Inc., 9940 Summers Ridge Rd., San Diego, CA, 92121, USA ; John Romeo

The effects of acoustic beam directivity on the accuracy of acoustic Doppler current profiling are discussed. Traditionally, a transducer's main lobe is considered when analyzing Doppler profiler performance. However, excessively large secondary lobes dominate the overall transducer directivity near boundaries and limit profiler performance. Side-lobe suppression design is shown to improve the overall system directivity by almost 50%. Results of transducer directivity numerical modeling are in good agreement with laboratory calibrations. Practical implications of improved directivity for velocity profiling near boundaries are discussed.

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Date of Conference:

Sept. 29 2007-Oct. 4 2007