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Ultrasonic reflectometry in air: errors of sample positioning.

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Area of Science:

  • Acoustics
  • Materials Science
  • Metrology

Background:

  • Ultrasonic reflectometry in air is a valuable non-destructive testing technique.
  • Understanding the impact of experimental conditions on measurement accuracy is crucial.
  • Accurate characterization of solid materials using ultrasound requires precise sample handling.

Purpose of the Study:

  • To investigate the influence of sample positioning errors on the ultrasonic reflection coefficient in air.
  • To validate simulation results with experimental data for ultrasonic reflectometry.
  • To provide insights for improving precision and reducing errors in ultrasonic testing.

Main Methods:

  • Finite beam model and angular spectrum method were employed for simulations.
  • Experimental validation was conducted to confirm simulation findings.
  • Analysis focused on the dependence of the reflection coefficient on sample shift and inclination.

Main Results:

  • Wave divergence was found to have an insignificant role in the reflection coefficient for the studied parameters.
  • Sample shifting primarily affects the phase of the reflection coefficient.
  • Sample inclination errors predominantly influence the magnitude of the reflection coefficient.

Conclusions:

  • High precision in sample positioning is essential for accurate ultrasonic reflectometry in air.
  • Simulation and experimental results highlight the critical impact of positioning errors.
  • The findings are applicable to error assessment, calibration, and precision enhancement in reflectometry applications.