Holographic real‐time imaging of standing waves in gases

Autor:	Trent A. Perkins, Chad W. Hoyt, Adam Dickson, Stephan J. Pankratz, Richard W. Peterson
Rok vydání:	1996
Předmět:	Physics business.industry Acoustics Astrophysics::Instrumentation and Methods for Astrophysics Acoustic interferometer Physics::Optics General Physics and Astronomy Acoustic wave Holographic interferometry Standing wave Resonator Interferometry Wavelength Optics business Sound pressure
Zdroj:	American Journal of Physics. 64:1139-1142
ISSN:	1943-2909 0002-9505
DOI:	10.1119/1.18358
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3063e228afc0afb6ee35a91b65450236 https://doi.org/10.1119/1.18358 Zobrazit plný text záznamu