Analysis of standing sound waves using holographic interferometry

Daniel A. Russell, David E. Parker, Russell S. Hughes

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Optical holographic interferometry was used to study standing sound waves in air inside a resonance tube driven by a small loudspeaker at one end. The front face of the resonance tube was constructed with plexiglass, allowing optical interrogation of the tube interior. The object beam of the holographic setup was directed through the plexiglass and reflected off the back wall of the resonator. When driven at resonance, the fluctuations in the air density at the antinodes altered the refractive index of the air in the tube, causing interference patterns in the resulting holographic images. Real-time holography was used to determine resonance frequencies and to measure the wavelengths of the standing waves. Time-average holography was used to observe the effect of increasing the sound pressure level on the resulting fringe pattern. A simple theory was developed to successfully predict the fringe pattern.

Original languageEnglish (US)
Pages (from-to)678-682
Number of pages5
JournalAmerican Journal of Physics
Volume77
Issue number8
DOIs
StatePublished - Aug 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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