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Optics Letters

Optics Letters


  • Vol. 20, Iss. 14 — Jul. 15, 1995
  • pp: 1577–1579

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

Eric B. Cummings, Hans G. Hornung, Michael S. Brown, and Peter A. DeBarber  »View Author Affiliations

Optics Letters, Vol. 20, Issue 14, pp. 1577-1579 (1995)

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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 ×10−4. Nonlinear, least-squares fits between modeled and experimental signals provided accurate values of the sound speed and thermal diffusivity.

© 1995 Optical Society of America

Original Manuscript: March 9, 1995
Published: July 15, 1995

Eric B. Cummings, Michael S. Brown, Peter A. DeBarber, and Hans G. Hornung, "Measurement of gas-phase sound speed and thermal diffusivity over a broad pressure range using laser-induced thermal acoustics," Opt. Lett. 20, 1577-1579 (1995)

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