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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 6 — Feb. 20, 2001
  • pp: 741–747

Comparison of Gas Temperatures Measured by Coherent Anti-Stokes Raman Spectroscopy (CARS) of O2 and N2

Thomas A. Reichardt, Paul E. Schrader, and Roger L. Farrow  »View Author Affiliations


Applied Optics, Vol. 40, Issue 6, pp. 741-747 (2001)
http://dx.doi.org/10.1364/AO.40.000741


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Abstract

We investigate the accuracy of temperature measurements by coherent anti-Stokes Raman spectroscopy (CARS) of O<sub>2</sub> and use measurements taken with N<sub>2</sub> CARS and a thermocouple for comparison. Scanning vibrational CARS spectra of O<sub>2</sub> and N<sub>2</sub> 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 CH<sub>4</sub>–O<sub>2</sub>–N<sub>2</sub> 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 N<sub>2</sub> and the O<sub>2</sub> 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 O<sub>2</sub> is present in sufficient concentrations (≈10% or greater), the accuracy of O<sub>2</sub> thermometry is comparable with that of N<sub>2</sub>.

© 2001 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering

Citation
Thomas A. Reichardt, Paul E. Schrader, and Roger L. Farrow, "Comparison of Gas Temperatures Measured by Coherent Anti-Stokes Raman Spectroscopy (CARS) of O2 and N2," Appl. Opt. 40, 741-747 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-6-741

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