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Related Experiment Videos

Surface acoustic wavefront sensor using custom optics.

Steve D Sharples1, Matthew Clark, Mike Somekh

  • 1Applied Optics, Electrical and Electronic Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK. steve.sharples@nottingham.ac.uk

Ultrasonics
|March 30, 2004
PubMed
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A new surface acoustic wavefront sensor, built with CMOS technology, accurately measures ultrasound distortions. This acoustic sensor enhances adaptive optical scanning acoustic microscopy resolution and accuracy by correcting for aberrations.

Area of Science:

  • Acoustic Microscopy
  • Optical Sensing
  • Materials Science

Background:

  • Surface acoustic waves are crucial for material characterization.
  • Aberrations in acoustic wavefronts limit the resolution and accuracy of acoustic microscopy.
  • Existing methods for wavefront sensing are often complex or lack precision.

Purpose of the Study:

  • To design and develop a novel surface acoustic wavefront sensor.
  • To integrate this sensor into an adaptive optical scanning acoustic microscope.
  • To improve the resolution and accuracy of acoustic microscopy by correcting wavefront distortions.

Main Methods:

  • Fabrication of a custom surface acoustic wavefront sensor using a standard CMOS process.
  • Utilizing laser light focused by a cylindrical lens to detect ultrasound-induced perturbations on an object's surface.

Related Experiment Videos

  • Imaging reflected light onto a custom linear array of split photodiodes for high-frequency perturbation detection.

    • Main Results:

    • The developed sensor accurately captures high-frequency angular perturbations of reflected laser light.
    • These perturbations correlate directly with the amplitude and phase of surface acoustic waves.
    • The sensor effectively detects acoustic wavefront distortions caused by aberrating media like polycrystalline metals.

    Conclusions:

    • The custom CMOS-based surface acoustic wavefront sensor provides a robust method for measuring acoustic wavefronts.
    • Integration into an adaptive optical scanning acoustic microscope allows for real-time aberration correction.
    • This approach significantly enhances the resolution and accuracy of acoustic microscopy for material analysis.