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Phased array approach to generate guided waves and extract phase velocities using the V(z) method.

Michaël Lematre1, Marc Lethiecq1

  • 1GREMAN Laboratory, CNRS - UMR 7347, Université de Tours / INSA CVL, Blois, France.

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Summary

Phased array transducers can effectively replace single-element transducers for the V(z) method, enabling accurate guided wave velocity measurements for material characterization. Careful parameter selection ensures stable V(z) curves for anisotropic substrates.

Keywords:
Guided modesPhased array transducerSilicon substrateV(z) acoustic signature

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Area of Science:

  • Materials Science
  • Acoustics
  • Non-destructive Testing

Background:

  • The V(z) method is crucial for determining material elastic constants from guided wave velocities.
  • Classical single-element transducers limit the V(z) method's flexibility and applicability.
  • Phased array transducers offer potential advantages in generating and detecting acoustic waves.

Purpose of the Study:

  • To investigate the feasibility of using phased array transducers with the V(z) method.
  • To analyze the benefits and necessary precautions for employing phased array transducers in V(z) measurements.
  • To explore the influence of phased array parameters on guided wave generation and detection.

Main Methods:

  • Development of a model for V(z) acoustic signatures using phased array transducers.
  • Application of a delay law for focused acoustic field generation.
  • Analysis of phased array parameters (element count, focal distance, frequency) on anisotropic silicon substrates.

Main Results:

  • Demonstrated successful generation and detection of V(z) curves using phased array transducers, comparable to focused transducers.
  • Illustrated the impact of phased array parameters on the generation and detection of various acoustic waves (SAW, PSAW, SSQW).
  • Validated the V(z) method with phased array transducers for characterizing anisotropic materials.

Conclusions:

  • Phased array transducers are a viable alternative to single-element transducers for the V(z) method.
  • Optimizing phased array parameters and frequency is essential for stable and accurate V(z) measurements.
  • This approach enhances the capability for deducing elastic constants from guided wave velocities in anisotropic materials.