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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Temperature-dependent diffusing acoustic wave spectroscopy with resonant scatterers.

Valentin Leroy1, Arnaud Derode

  • 1Laboratoire Ondes et Acoustique, Université Paris Diderot-Paris 7, ESPCI-CNRS (UMR 7587), Paris, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

A slight temperature change affects multiply scattered acoustic waves. This study reveals how temperature influences wave correlation and detects subtle scatterer resonances using ultrasonic wave analysis.

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Area of Science:

  • Acoustics
  • Wave Propagation
  • Materials Science

Background:

  • Multiply scattering media are sensitive to environmental changes.
  • Diffusing-wave spectroscopy (DWS) principles can be applied to acoustic waves.
  • Understanding acoustic wave behavior in complex media is crucial for material characterization.

Purpose of the Study:

  • To investigate the influence of minor temperature variations on the correlation of multiply scattered acoustic waves.
  • To analyze the role of scatterers in wave decorrelation at different temperatures.
  • To explore a novel method for detecting subtle scatterer resonances.

Main Methods:

  • Utilized ultrasonic waves (approx. 3 MHz) transmitted through a steel rod-water sample.
  • Employed an array of transducers to record scattered acoustic signals at varying temperatures.
  • Computed cross-correlations of highly scattered signals and performed time-frequency analysis.

Main Results:

  • Identified temperature-induced dilation of arrival times due to sound velocity changes in water.
  • Observed that scatterers contribute to wave form decorrelation.
  • Detected significant decorrelation at specific frequencies linked to scatterer resonant behavior.

Conclusions:

  • The study demonstrates a temperature-sensitive acoustic correlation technique.
  • Experimental results revealed a previously undetected small resonance in the scatterers.
  • The proposed analysis method offers enhanced sensitivity for material property characterization.