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An interferometric technique for B/A measurement

E C Everbach1, R E Apfel

  • 1Yale Center for Acoustics, Yale University, New Haven, Connecticut 06520, USA.

The Journal of the Acoustical Society of America
|December 1, 1995
PubMed
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A new isentropic phase method accurately measures acoustic nonlinearity (B/A) in various liquids like buffers and emulsions. This technique uses an acoustic interferometer to detect subtle sound speed changes under pressure, achieving high precision.

Area of Science:

  • Acoustics
  • Biophysics
  • Materials Science

Background:

  • The acoustic nonlinearity parameter (B/A) is crucial for characterizing materials.
  • Measuring B/A in complex fluids like biological solutions and emulsions presents challenges.
  • Existing methods may lack precision or applicability to diverse sample types.

Purpose of the Study:

  • To present a novel isentropic phase method for in vitro measurement of the acoustic nonlinearity parameter B/A.
  • To validate the method's accuracy and applicability across various aqueous buffers, protein solutions, lipid oils, and emulsions.

Main Methods:

  • Utilized an acoustic interferometer to measure sound speed.
  • Applied rapid hydrostatic pressure changes (1-2 atmospheres).
  • Employed an isentropic phase approach to analyze acoustic nonlinearity.

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Main Results:

  • Successfully measured the acoustic nonlinearity parameter B/A in diverse liquid samples.
  • Demonstrated high accuracy with average errors of 0.85%.
  • The method proved effective for aqueous buffers, protein solutions, lipid oils, and emulsions.

Conclusions:

  • The described isentropic phase method provides a precise and versatile tool for B/A measurement.
  • This technique is suitable for characterizing the acoustic properties of various biological and non-biological fluids.
  • The high accuracy achieved facilitates detailed material characterization in biophysical and materials science applications.