Measurement of gas-phase sound speed and thermal diffusivity over a broad pressure range using laser-induced thermal acoustics

We report on the detection and analysis of signals generated from gas-phase laser-induced gratings over a large range of static pressure (0.04-100 atm). We employed the experimental technique of laser-induced thermal acoustics and performed measurements on mixtures of NO(2) in air and CO(2) as a fun...

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Bibliographic Details
Published in:Optics letters 1995-07, Vol.20 (14), p.1577-1579
Main Authors: Cummings, E B, Hornung, H G, Brown, M S, Debarber, P A
Format: Article
Language:English
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Summary:We report on the detection and analysis of signals generated from gas-phase laser-induced gratings over a large range of static pressure (0.04-100 atm). We employed the experimental technique of laser-induced thermal acoustics and performed measurements on mixtures of NO(2) in air and CO(2) as a function of pressure. Accurate analysis of the acquired data was obtained from a full theory, including beam size effects. The theory fully reproduces the observed data for a ratio of molecular mean free path to grating wavelength extending from 1 to 4 x 10(-4). Nonlinear, least-squares f its between modeled and experimental signals provided accurate values of the sound speed and thermal diffusivity.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.20.001577