| Publication type: |
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Article in peer-reviewed journal |
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| Subject: |
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| Title: |
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Locating a weak change using diffuse waves: Theoretical approach and inversion procedure |
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| Author(s): |
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Vincent Rossetto 1, Ludovic Margerin 2, Thomas Planès 3, Eric Larose 3 |
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| Laboratory: |
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| Research team: |
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Ondes et structures |
| Abstract: |
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We describe a time-resolved monitoring technique for heterogeneous media. Our approach is based on the spatial variations of the cross-coherence of diffuse waves acquired at fixed positions but at different dates. The technique applies to all kind of waves, provided that waveforms can be acquired with a sampling frequency much larger than the wave frequency. To locate and characterize a weak change that occurred between successive acquisitions, we use a maximum likelihood approach combined with a diffusive propagation model. We characterize this technique, locating a weak change using diffuse waves, called LOCADIFF, with the aid of numerical simulations. In several illustrative examples, we show that the change can be located with a precision of a few wavelengths and that its effective scattering cross-section can be retrieved. We investigate how the accuracy and precision of the method depends on the number of source-receiver pairs, on the time window used to compute the cross-correlation and on the errors in the propagation model. Applications can be found in nondestructive testing, seismology, radar, and sonar location. |
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| Fulltext language: |
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English |
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| Production date: |
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2010-08-23 |
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| Journal: |
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| Journal of Applied Physics (J. Appl. Phys.) |
| Publisher |
American Institute of Physics (AIP) |
| ISSN |
0021-8979 |
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| Audience: |
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international |
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| Publication date: |
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2011-02-03 |
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| Volume: |
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109 |
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| Issue: |
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3 |
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| Page, identifiant, ...: |
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034903 |
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| Keyword(s): |
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acoustic wave propagation – maximum likelihood estimation – numerical analysis |
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| Classification: |
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43.25.Cb Macrosonic propagation, finite amplitude sound; shock waves |
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| ANR Project: |
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| Project Id |
ANR-08-JCJC-0066 SISDIF |
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