Abstract

This work describes the development of a dual-pump coherent anti-Stokes Raman spectroscopy system for simultaneous measurements of the temperature and the absolute mole fraction of ${\mathrm{N}}_2$, ${\mathrm{O}}_2$, and ${\mathrm{H}}_2$ in supersonic combusting flows. Changes to the experimental setup and the data analysis to improve the quality of the measurements in this turbulent, high-temperature reacting flow are described. The accuracy and precision of the instrument have been determined using data collected in a Hencken burner flame. For temperatures above 800 K, errors in the absolute mole fraction are within 1.5%, 0.5%, and 1% of the total composition for ${\mathrm{N}}_2$, ${\mathrm{O}}_2$, and ${\mathrm{H}}_2$, respectively. Standard deviations based on 500 single shots are between 10 and 65 K for the temperature, between 0.5% and 1.7% of the total composition for ${\mathrm{O}}_2$, and between 1.5% and 3.4% for ${\mathrm{N}}_2$. The standard deviation of ${\mathrm{H}}_2$ is $\sim 10\%$ of the average measured mole fraction.

© 2013 Optical Society of America

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