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Related Experiment Videos

Contact phase modulation method for acoustic nonlinear parameter measurement in solid.

M Vila1, F Vander Meulen, S Dos Santos

  • 1LUSSI/GIP Ultrasons FRE 2448, Rue de la Chocolaterie, BP 3410, 41034 Blois Cedex, France. vila@univ-tours.fr

Ultrasonics
|March 30, 2004
PubMed
Summary

A novel contact method accurately measures the nonlinearity parameter beta in solid plates using interacting high-frequency (HF) and low-frequency (LF) waves. This technique validates well with Fused Silica, confirming its negative nonlinearity parameter.

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Area of Science:

  • Materials Science
  • Acoustics
  • Solid Mechanics

Background:

  • Nonlinearity parameter (beta) is crucial for characterizing material behavior under stress.
  • Accurate measurement of beta in solid plates is challenging, especially using contact methods.
  • Existing techniques may lack precision or require non-contact setups.

Purpose of the Study:

  • To introduce a new, in-contact method for measuring the nonlinearity parameter beta in solid plates.
  • To validate the proposed method using a well-characterized material like Fused Silica.
  • To demonstrate the capability of the method in accurately determining the sign and magnitude of beta.

Main Methods:

  • Utilized a high-frequency (HF) tone-burst (20 MHz) and a low-frequency (LF) pulse (2.5 MHz) applied collinearly to opposite faces of a solid plate.

Related Experiment Videos

  • The nonlinear interaction generated phase modulation of the HF wave, proportional to beta and LF particle velocity.
  • Employed extended self-reciprocity calibration in the time domain to determine LF particle velocity.
  • Performed numerical phase demodulation to extract the beta coefficient.

    • Main Results:

    • Successfully measured the nonlinearity parameter beta of solid plates using the developed contact method.
    • Validated the method with Fused Silica, achieving results in good agreement with established literature values.
    • The measurement correctly identified the negative sign of the nonlinearity parameter for Fused Silica.

    Conclusions:

    • The presented in-contact method provides a reliable and accurate approach for determining the nonlinearity parameter beta in solid materials.
    • This technique offers a practical alternative for material characterization, particularly where non-contact methods are not feasible.
    • The validation with Fused Silica underscores the method's precision and its ability to capture the sign of nonlinearity.