Single shot CARS thermometry of hydrogen-contaning multicomponent gaseous mixtures at high pressure and high temperature

V. V. Smirnov; O. M. Stel'makh; K. A. Vereschagin; V. I. Fabelinsky; A. K. Vereschagin; S. Yu. Volkov; W. Clauss; M. Oschwald

doi:10.1117/12.752378

9 July 2007 Single shot CARS thermometry of hydrogen-contaning multicomponent gaseous mixtures at high pressure and high temperature

V. V. Smirnov, O. M. Stel'makh, K. A. Vereschagin, V. I. Fabelinsky, A. K. Vereschagin, S. Yu. Volkov, W. Clauss, M. Oschwald

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Proceedings Volume 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics; 67271L (2007) https://doi.org/10.1117/12.752378
Event: The International Conference on Coherent and Nonlinear Optics, 2007, Minsk, Belarus

Abstract

We demonstrate the feasibility of the proposed new approach to CARS thermometry of hydrogen-containing mixtures with simultaneous measurement of the intensities of a hydrogen spectrum Q-branch lines and their linewidths in a single laser shot by means of a spectrograph combined with an interferometer, that have orthogonal directions of dispersions. This provides correct temperature evaluation that takes into account the linewidths, measured directly. The experiments were carried out in a H₂:N₂ = 1:10 mixture in a heated cell at a temperature of 1050 K. The values of gas mixture temperature, that were defined in a pressure range of 2-9 MPa from DBB CARS spectra taking into account linewidth corrections, coincide with a thermocouple measurements within ~ 2 %. Without these corrections the discrepancies increase up to 5 %. The proposed approach can be applied to CARS thermometry in the course of investigations of H₂ and hydrocarbon combustion without the necessity to measure species concentrations, and does not require the knowledge of the line-broadening coefficients.

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V. V. Smirnov, O. M. Stel'makh, K. A. Vereschagin, V. I. Fabelinsky, A. K. Vereschagin, S. Yu. Volkov, W. Clauss, and M. Oschwald "Single shot CARS thermometry of hydrogen-contaning multicomponent gaseous mixtures at high pressure and high temperature", Proc. SPIE 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics, 67271L (9 July 2007); https://doi.org/10.1117/12.752378

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KEYWORDS

Temperature metrology

Hydrogen

Spectrographs

Thermometry

Combustion

Interferometers

Dye lasers

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