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Related Experiment Videos

Gas jets as ultrasonic waveguides.

D W Choi1, D A Hutchins, D R Billson

  • 1School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.

The Journal of the Acoustical Society of America
|September 30, 2003
PubMed
Summary

This study demonstrates ultrasonic waveguide effects in gas jets, using cooling and specific gases like carbon dioxide (CO2) to collimate sound beams for improved imaging in solid testing.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Materials Science

Background:

  • Ultrasound propagation in gas jets can exhibit waveguide effects.
  • Collimating ultrasonic beams is crucial for applications like non-destructive testing.

Purpose of the Study:

  • To investigate methods for achieving ultrasonic waveguide effects in gas jets.
  • To enhance the collimation of ultrasonic beams for improved imaging.

Main Methods:

  • Investigated cooling an air jet below ambient temperature.
  • Tested gases with lower (carbon dioxide) and higher (helium) acoustic velocities than air.
  • Developed and evaluated a carbon dioxide/air gas mixture.

Main Results:

  • Cooling an air jet produced a noticeable waveguide effect.
  • Carbon dioxide enhanced ultrasonic beam confinement; helium caused divergence.
  • A CO2/air mixture provided a well-collimated sound field with limited attenuation.

Conclusions:

  • Gas jet properties significantly influence ultrasound propagation and beam collimation.
  • Mixed gas jets, specifically CO2/air, offer an effective solution for ultrasonic waveguides.
  • Demonstrated the utility of these waveguides for air-coupled testing of solids.

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