Abstract

We investigate the accuracy of temperature measurements by coherent anti-Stokes Raman spectroscopy (CARS) of O₂ and use measurements taken with N₂ CARS and a thermocouple for comparison. Scanning vibrational CARS spectra of O₂ and N₂ were recorded over a broad range of temperatures: between 294 K and 1900 K in air that was heated in a tube furnace and at approximately 2450 K in a fuel-lean CH₄–O₂–N₂ flame. Temperatures were derived from least-squares fits of simulated and experimental spectra. Both the fundamental vibrational band and the first hot vibrational band were included in fitting. In the case of the tube furnace, the N₂ and the O₂ CARS temperature measurements agreed to within 3%, and results were similar with the thermocouple; in the flame the agreement was to within 1%. We conclude that, for cases in which O₂ is present in sufficient concentrations (≈10% or greater), the accuracy of O₂ thermometry is comparable with that of N₂.

© 2001 Optical Society of America

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