Dual-pump coherent anti-Stokes Raman scattering (CARS) has been demonstrated for the simultaneous measurement of gas-phase temperature and concentrations of molecular nitrogen and oxygen. A polarization technique was used to vary the relative intensities of the two CARS signals and expand the dynamic range of the relative concentration measurements. Detailed temperature and oxygen mole fraction measurements were performed in the stabilization region of a hydrogen–nitrogen jet diffusion flame. These results indicate that there is a region below the nozzle exit where significant amounts of oxygen are found on the fuel side of the peak flame temperature profile.
© 1997 Optical Society of America
Original Manuscript: August 12, 1996
Revised Manuscript: November 27, 1996
Published: May 20, 1997
Robert D. Hancock, Frederick R. Schauer, Robert P. Lucht, and Roger L. Farrow, "Dual-pump coherent anti-Stokes Raman scattering measurements of nitrogen and oxygen in a laminar jet diffusion flame," Appl. Opt. 36, 3217-3226 (1997)