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Aberrations in materials with random inhomogeneities.

J A Hernández1, M Clark, S D Sharples

  • 1School of Elec. and Elec. Engineering, The University of Nottingham, NG7 2RD, United Kingdom. eexjah@nottingham.ac.uk

The Journal of the Acoustical Society of America
|April 6, 2007
PubMed
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This study introduces a phase screen model to address how random microstructures in materials affect ultrasonic measurements. The model enables statistical analysis of acoustic field aberrations, aiding in material characterization.

Area of Science:

  • Materials Science
  • Acoustics
  • Wave Propagation

Background:

  • Random microstructures in materials can degrade ultrasonic measurement quality through scattering and aberration.
  • Existing methods struggle to accurately model these effects, impacting signal strength and accuracy.

Purpose of the Study:

  • To develop a statistical model for analyzing acoustic field aberrations caused by material microstructures.
  • To establish a method for estimating mean crystallite size using ultrasonic measurements.

Main Methods:

  • Development of a phase screen model integrated with the stochastic wave equation.
  • Statistical analysis of acoustic field properties and experimental validation.
  • Interlinking measured acoustic field correlation functions with material microstructure properties.

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Main Results:

  • Demonstrated experimental evidence of acoustic field aberration.
  • Quantified statistical properties of the measured acoustic field.
  • Established a theoretical coherence function linking acoustic field correlation to microstructure.

Conclusions:

  • The developed phase screen model effectively accounts for ultrasonic measurement degradation due to random microstructures.
  • This technique provides a novel approach for estimating mean crystallite size, offering insights into material characterization.