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Journal of the Acoustical Society of America

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Dec 2008

Volume 124, Issue 6, pp. 3351-EL365

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Shear elasticity estimation from surface wave: The time reversal approach

J. Brum, S. Catheline, N. Benech, and C. Negreira

J. Acoust. Soc. Am. Volume 124, Issue 6, pp. 3377-3380 (2008); (4 pages) | Cited 1 time

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In this work the shear elasticity of soft solids is measured from the surface wave speed estimation. An external source creates mechanical waves which are detected using acoustic sensors. The surface wave speed estimation is extracted from the complex reverberated elastic field through a time-reversal analysis. Measurements in a hard and a soft gelatin-based phantom are validated by independent transient elastography estimations. In contrast with other elasticity assessment methods, one advantage of the present approach is its low sound technology cost. Experiments performed in cheese and soft phantoms allows one to envision applications in the food industry and medicine.
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43.60.Tj Wave front reconstruction, acoustic time-reversal, and phase conjugation
43.20.Jr Velocity and attenuation of elastic and poroelastic waves
43.80.Pe Agroacoustics
43.20.Ye Measurement methods and instrumentation

Comment on “Linear and nonlinear frequency shifts in acoustical resonators with varying cross sections” [ J. Acoust. Soc. Am. 110, 109–119 (2001) ]

Michael P. Mortell and Brian R. Seymour

J. Acoust. Soc. Am. Volume 124, Issue 6, pp. 3381-3385 (2008); (5 pages) | Cited 1 time

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The effects of the shape of the container on nonlinear resonant oscillations have been of interest for the past decade. Resonant oscillations in a closed straight tube can contain shocks, but for some tube shapes shock formation can be prevented. How the magnitude of the variation of the shape from a straight tube affects the prevention of shocks is discussed. Criteria to determine whether tuning curves bend right or left are addressed, including that proposed by Hamilton et al. [“Linear and nonlinear frequency shifts in acoustical resonators with varying cross sections,” J. Acoust. Soc. Am. 110, 109–119 (2001)] .
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43.25.Gf Standing waves; resonance
43.25.Cb Macrosonic propagation, finite amplitude sound; shock waves
43.20.Ks Standing waves, resonance, normal modes

Reply to “Comment on ‘Linear and nonlinear frequency shifts in acoustical resonators with varying cross sections’ [ J. Acoust. Soc. Am. 110, 109–119 (2001) ]”

Mark F. Hamilton, Yurii A. Ilinskii, and Evgenia A. Zabolotskaya

J. Acoust. Soc. Am. Volume 124, Issue 6, pp. 3386-3389 (2008); (4 pages) | Cited 1 time

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M. P. Mortell and B. R. Seymour [ M. P. Mortell and B. R. Seymour [J. Acoust. Soc. Am. 124, 3381–3385 (2008) ] offer commentary on the analysis and the conclusions reached in a paper by Hamilton et al. [ M. F. Hamilton, Yu. A. Ilinskii, and E. A. Zabolotskaya, J. Acoust. Soc. Am. 110, 109–119 (2001) ] on linear and nonlinear frequency shifts in acoustical resonators that are close to cylindrical in shape. The present reply demonstrates that the criticisms made in the Comment are unwarranted when placed in context of the stated restrictions on the theory and the applications for which the theory is intended. It is also shown that the strongest criticisms made in the Comment stem from a mathematical error they introduced when attempting to reproduce the results of Hamilton et al.
Show PACS
43.25.Gf Standing waves; resonance
43.20.Ks Standing waves, resonance, normal modes
43.25.Cb Macrosonic propagation, finite amplitude sound; shock waves
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