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Photoacoustic point source.

I G Calasso1, W Craig, G J Diebold

  • 1Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.

Physical Review Letters
|May 1, 2001
PubMed
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This study explores the photoacoustic effect in fluids, revealing how linear and nonlinear mechanisms generate distinct sound waves. Rapid heat deposition and nonlinear thermal expansion are key drivers of ultrasound production from point sources.

Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Optics

Background:

  • The photoacoustic effect describes sound generation from light absorption and subsequent heat deposition.
  • Understanding fluid motion is crucial for various applications, including medical imaging and non-destructive testing.

Purpose of the Study:

  • To investigate the photoacoustic effect generated by localized heat deposition in an inviscid fluid.
  • To analyze the characteristics of sound waves produced by both linear and nonlinear mechanisms.

Main Methods:

  • Solving the wave equation for displacement potential using delta-function and Gaussian optical pulses as heat sources.
  • Modeling fluid motion resulting from heat deposition.

Main Results:

Related Experiment Videos

  • Linear sound generation produces bipolar photoacoustic waves.
  • Nonlinear mechanisms result in asymmetric tripolar waves.
  • Rapid heat deposition and nonlinear thermal expansion are identified as dominant factors in ultrasound production.

    • Conclusions:

    • The study elucidates the distinct wave patterns generated by linear and nonlinear photoacoustic processes.
    • It highlights the critical role of rapid heating and nonlinear thermal expansion in ultrasound generation from point sources in fluids.