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Proceedings Paper

Trace species concentration and temperature measurements at high pressure using laser-induced grating spectroscopy
Author(s): Michael S. Brown; Peter A. DeBarber; Eric B. Cummings; Hans G. Hornung
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Paper Abstract

We have recorded laser-induced grating signals from mixtures of NO2 and air over a pressure range extending from less that 100 kPa (1 atm) to 10 MPa (100 atm). Signals generated from concentrations of NO2 at the part-per-million level have been successfully detected with high signal-to-noise rations. The measurements were made using the technique of laser-induced thermal acoustics (LITA). Analysis of the acquired data was made using a comprehensive theory which includes the hydrodynamic response of the fluid and finite beam-size effects. The observed pressure dependence of the peak amplitude signals is consistent with the theory. Additionally, least squares fits between the theory and the temporally resolved signal yield accurate values of the local sound speed and thermal diffusivity. Determination of the local sound speed provides a measurement of the local temperature.

Paper Details

Date Published: 29 September 1995
PDF: 11 pages
Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); doi: 10.1117/12.221556
Show Author Affiliations
Michael S. Brown, MetroLaser (United States)
Peter A. DeBarber, MetroLaser (United States)
Eric B. Cummings, California Institute of Technology (United States)
Hans G. Hornung, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2546:
Optical Techniques in Fluid, Thermal, and Combustion Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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