| Time-resolved tracking of a sound scatterer in a complex flow: nonstationary signal analysis and applications. | |
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MedLine Citation:
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PMID: 12141335 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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It is known that ultrasound techniques yield nonintrusive measurements of hydrodynamic flows. For example, the study of the echoes produced by a large number of particles insonified by pulsed wavetrains has led to a now-standard velocimetry device. In this paper, a new technique for the measurement of the velocity of individual solid particles moving in fluid flows is proposed. It relies on the ability to resolve in time the Doppler shift of the sound scattered by the continuously insonified particle. For this signal-processing problem two classes of approaches can be used: time-frequency analysis and parametric high-resolution methods. In the first class the spectrogram and reassigned spectrogram is considered, and applied to detect the motion of a small bead settling in a fluid at rest. In nonstationary flows, methods in the second class are more robust. An approximated maximum likelihood (AML) technique has been adapted, coupled with a generalized Kalman filter. This method allows for the estimation of rapidly varying frequencies; the parametric nature of the algorithm also provides an estimate of the variance of the identified frequency parameters. |
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Authors:
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Nicolas Mordant; Jean-François Pinton; Olivier Michel |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 112 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2002 Jul |
Date Detail:
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Created Date: 2002-07-26 Completed Date: 2002-08-22 Revised Date: 2006-12-27 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 108-18 Citation Subset: - |
Affiliation:
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Ecole Normale Supérieure de Lyon & CNRS UMR 5672, Laboratoire de Physique, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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