CaltechAUTHORS
  A Caltech Library Service

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

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

[img]
Preview
PDF
See Usage Policy.

270Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:CUMol95

Abstract

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.


Item Type:Article
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.
Record Number:CaltechAUTHORS:CUMol95
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CUMol95
Alternative URL:http://www.opticsinfobase.org/abstract.cfm?URI=ol-20-14-1577
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5048
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:22 Sep 2006
Last Modified:26 Dec 2012 09:03

Repository Staff Only: item control page