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Thickness or phase velocity measurements using the Green's function comparison method.

Niicolas Etaix1, Alexandre Leblanc, Mathias Fink

  • 1Laboratoire Ondes et Acoustique, Institut Langevin, University Paris 7, Ecole Supérieure de Physique et de ChimieIndustrielles de la Ville de Paris, Centre National de la Recherche Scientifique UMR 7587, Paris, France. ros-kiri.ing@espci.fr

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 4, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for measuring plate thickness using acoustic guided waves in confined spaces. The technique accurately determines plate velocity or thickness by analyzing wave propagation in finite plates.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Acoustic guided wave propagation is typically studied in free space for plate thickness measurement.
  • Finite plate dimensions and arbitrary geometries present challenges for traditional methods.

Purpose of the Study:

  • To develop a method for acoustic guided wave propagation analysis in closed environments.
  • To enable accurate plate thickness measurement for plates with finite dimensions and arbitrary geometries.

Main Methods:

  • The study utilizes a plate Green's function composed of an infinite plate term and a correction term.
  • It analyzes acoustic wave propagation generated by a point source and a circular array of sources.
  • The ratio between these signals is measured to determine plate properties.

Main Results:

  • The method successfully measures plate velocity and thickness.
  • It is applicable to isotropic, anisotropic, and inhomogeneous plates of various geometries.
  • The technique also works in a passive mode without an active transmitter.

Conclusions:

  • This novel approach extends acoustic guided wave analysis to closed environments.
  • It offers a versatile and effective method for non-destructive plate thickness and velocity measurement.
  • The technique's adaptability to different plate types and passive operation highlights its practical significance.