Trace species concentration and temperature measurements at high pressure using laser-induced grating spectroscopy

Michael S. Brown; Peter A. DeBarber; Eric B. Cummings; Hans G. Hornung

doi:10.1117/12.221556

29 September 1995 Trace species concentration and temperature measurements at high pressure using laser-induced grating spectroscopy

Michael S. Brown, Peter A. DeBarber, Eric B. Cummings, Hans G. Hornung

Author Affiliations +

Proceedings Volume 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow; (1995) https://doi.org/10.1117/12.221556
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Michael S. Brown, Peter A. DeBarber, Eric B. Cummings, and Hans G. Hornung "Trace species concentration and temperature measurements at high pressure using laser-induced grating spectroscopy", Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); https://doi.org/10.1117/12.221556

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