Holographic real‐time imaging of standing waves in gases
作者:
Richard W. Peterson,
Stephan J. Pankratz,
Trent A. Perkins,
Adam Dickson,
Chad Hoyt,
期刊:
American Journal of Physics
(AIP Available online 1996)
卷期:
Volume 64,
issue 9
页码: 1139-1142
ISSN:0002-9505
年代: 1996
DOI:10.1119/1.18358
出版商: American Association of Physics Teachers
关键词: GASES;STANDING WAVES;HOLOGRAPHY;SOUND WAVES;RESONATORS;PHASE SHIFT;42.;03.40
数据来源: AIP
摘要:
Stroboscopic holographic interferometry has been developed at an advanced undergraduate level allowing real‐time imaging of standing sound waves in gas filled, closed tube resonators. A heterodyne Mach–Zehnder interferometer was first built by students to show the feasibility of interferometric detection of sound waves in a small cell. In the subsequent holographic study, the laser irradiance is modulated by an acousto‐optic cell at frequencies near that of the standing wave, and a video camera records the fringe motion due to sound pressure changes. Fractional fringe shifts are observed for an air filled cell, and multiple fringe shifts are imaged for the case of freon. Sound reflections from the cell ends are easily observed, with nonsinusoidal waveforms dominating at high intensities due to superposition of resonator harmonics.
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