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A model-based approach for B/A estimation using the finite amplitude insertion-substitution method.

Andreas Schrempf1, Lisa Stefely1, Thomas Thurner1

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This summary is machine-generated.

This study introduces an improved framework for estimating the acoustic nonlinearity parameter B/A using the finite amplitude insertion-substitution (FAIS) method. The new model enhances accuracy and robustness by accounting for wave effects and attenuation.

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Area of Science:

  • Acoustics
  • Nonlinear Acoustics
  • Materials Characterization

Background:

  • Accurate estimation of the acoustic nonlinearity parameter (B/A) is crucial for material science.
  • Conventional finite amplitude insertion-substitution (FAIS) methods have limitations due to assumptions like plane wave propagation.

Purpose of the Study:

  • To develop an enhanced, model-based framework for B/A estimation using the FAIS method in transmission mode.
  • To improve the accuracy and robustness of B/A measurements by addressing limitations of existing techniques.

Main Methods:

  • Developed a framework that eliminates the plane wave assumption, incorporating shape functions for transducer diffraction and wave superposition.
  • Included a correction term for second-harmonic attenuation to handle various attenuation exponents.
  • Supported both iterative and direct B/A estimation methods.

Main Results:

  • The enhanced framework significantly improves accuracy and robustness in B/A estimation compared to conventional FAIS methods.
  • Reduced sensitivity to experimental setup and transducer geometry.
  • Validated through simulations and experimental measurements.

Conclusions:

  • The proposed framework offers a more precise and reliable method for characterizing the acoustic nonlinearity parameter B/A.
  • Provides practical guidance for optimizing experimental parameters for B/A measurements.