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Part of book or chapter of book . 1990 . Peer-reviewed

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Photoacoustic and Mirage Effect on Liquids

descriptionPublicationkeyboard_double_arrow_right Part of book or chapter of book , Other literature type 01 Jan 1990Publisher:Springer Berlin Heidelberg

Authors: H. Schmitt; F. Lepoutre; R. Osiander; P. Korpiun;

doi: 10.1007/978-3-540-46972-8_89

Photoacoustic and Mirage Effect on Liquids

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Abstract

The temperature oscillation accompanying the photoacoustic effect (PAE) generates a periodic variation of vapor pressure P or the molar concentration χC in the transducer gas near the liquid surface /1/. Since χ is the mole fraction of the vapor and C the total concentration of the transducer gas, (1-χ)C is the molar concentration of the air in the closed microphone cell. For a modulation of light in the audiofrequency regime the dimensions of the volume of the cell gas are very small compared to the wavelength of a sound wave. Thus C can be considered to be constant with respect to the position in the gas but oscillating by an small amount Ψ(t) = ce1ωt around a mean value C0.

Related Organizations

Technical University of Munich
Germany
École Normale Supérieure
France

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