Cummings, Eric B. and Hornung, Hans G. and Brown, Michael S. and DeBarber, Peter A. (1995) Measurement of gas-phase sound speedand thermal diffusivity over a broad pressure range using laser-induced thermal acoustics. Optics Letters, 20 (14). pp. 1577-1579. ISSN 0146-9592 http://resolver.caltech.edu/CaltechAUTHORS:CUMol95
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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 NO2 in air and CO2 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 fits between modeled and experimental signals provided accurate values of the sound speed and thermal diffusivity.
|Additional Information:||© Copyright 1995 Optical Society of America Received March 9, 1995 This research was supported in part by NASA contract NAS3-27017 and U.S. Air Force Office of Scientific Research contract F49620-93-1-0338. We gratefully acknowledge the technical assistance of Jeff Mach and Bonifacio Calayag.|
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|Deposited On:||22 Sep 2006|
|Last Modified:||26 Dec 2012 09:03|
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