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Diffractive acoustic elements for laser ultrasonics

Clark1, Sharples, Somekh

  • 1School of Electrical and Electronic Engineering, University of Nottingham, University Park, United Kingdom.

The Journal of the Acoustical Society of America
|June 30, 2000
PubMed
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Computer-generated holograms create diffractive acoustic elements for laser ultrasonics. This enables precise control over surface acoustic waves, achieving frequency suppression and selective focusing for enhanced material analysis.

Area of Science:

  • Optics and Acoustics
  • Materials Science
  • Non-Destructive Testing

Background:

  • Laser ultrasonics is a key technique for generating surface acoustic waves (SAWs).
  • Computer-generated holograms (CGHs) have previously been used to control the spatial and frequency characteristics of ultrasound fields generated by laser excitation.
  • Existing methods offer limited control over the acoustic field's precise manipulation.

Purpose of the Study:

  • To extend the application of CGHs in laser ultrasonics.
  • To develop diffractive acoustic elements (DAEs) for advanced control of SAWs.
  • To demonstrate novel methods for manipulating Rayleigh wave propagation, including frequency suppression and focusing.

Main Methods:

  • Utilized computer-generated holograms (CGHs) to project specific optical distributions onto a sample surface.

Related Experiment Videos

  • Designed these optical distributions to function as diffractive acoustic elements (DAEs) for surface acoustic waves (SAWs).
  • Investigated the generation and manipulation of Rayleigh waves using these DAEs.

    • Main Results:

    • Successfully demonstrated the creation of DAEs using CGHs for SAW generation.
    • Achieved precise control over acoustic field properties, including frequency suppression and the formation of multiple focal points.
    • Showcased frequency-selective focusing of Rayleigh waves.
    • Exhibited excellent agreement between predicted optical distributions and experimentally measured acoustic fields.

    Conclusions:

    • CGHs can be effectively employed to create DAEs for sophisticated control of laser-generated SAWs.
    • This approach enables advanced acoustic manipulation, such as frequency suppression and selective focusing of Rayleigh waves.
    • The findings offer a powerful new tool for applications in materials characterization and non-destructive evaluation.