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Measurement of attenuation in a sample with nonparallel surfaces.

O I Lobkis1, S I Rokhlin1

  • 1Department of Materials Science and Engineering, Edison Joining Technology Center, The Ohio State University, 1248 Arthur E. Adams Drive, Columbus, OH 43221, USA.

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Summary

This study introduces a new immersion method for measuring ultrasonic attenuation in solids, even with nonparallel surfaces. The maximization method offers advantages for attenuation measurements in immersion experiments.

Keywords:
(Attenuation measurement method)(Attenuation)(Diffraction correction)(Nonparallel sample)

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Area of Science:

  • Materials Science
  • Non-destructive Testing
  • Acoustics

Background:

  • Ultrasonic attenuation is crucial for characterizing material microstructure.
  • Traditional methods require parallel sample surfaces for accurate attenuation measurements.
  • Measuring attenuation in samples with nonparallel surfaces is challenging.

Purpose of the Study:

  • To develop an immersion method for ultrasonic attenuation measurement in solids with nonparallel surfaces.
  • To introduce a novel maximization method for improved accuracy.
  • To provide a diffraction correction model for ultrasonic beams.

Main Methods:

  • Developed an immersion technique for samples with nonparallel surfaces.
  • Utilized a maximization method based on independent transducer alignment.
  • Incorporated a measurement model for ultrasonic beam diffraction correction.
  • Compared the new method with the conventional normalization procedure.

Main Results:

  • The developed immersion method successfully measures ultrasonic attenuation in samples with nonparallel surfaces.
  • The maximization method showed reasonable agreement with conventional methods for initial reflected pulses.
  • The diffraction correction model enhances measurement accuracy.

Conclusions:

  • The maximization method is advantageous for ultrasonic attenuation measurements via immersion.
  • This technique expands the applicability of ultrasonic testing to samples with geometric imperfections.
  • The study provides a valuable tool for materials characterization.