Abstract
Femtosecond time-resolved, fully resonant electronically enhanced coherent anti-Stokes Raman scattering (FREE-CARS) spectroscopy, incorporating a two-color excitation scheme, is used to demonstrate selective and sensitive gas-phase detection of the hydroxyl (OH) radical in a reacting flow. Spectral resolution of the emitted FREE-CARS signal allows simultaneous detection of temperature and relative OH mole fraction under single-laser-shot conditions in a laminar ethylene–air flame. By comparison to previously reported OH concentration and temperature measurements, we demonstrate excellent single-shot temperature accuracies ( deviation from adiabatic flame temperature) and precisions ( standard deviation), with simultaneous relative OH concentration measurements that demonstrate high detection sensitivity (100–300 ppm).
Full Article | PDF ArticleMore Like This
Hans U. Stauffer, K. Arafat Rahman, Mikhail N. Slipchenko, Sukesh Roy, James R. Gord, and Terrence R. Meyer
Opt. Lett. 43(20) 4911-4914 (2018)
W. D. Kulatilaka, H. U. Stauffer, J. R. Gord, and S. Roy
Opt. Lett. 36(21) 4182-4184 (2011)
Michel Pealat, P. Magre, P. Bouchardy, and G. Collin
Appl. Opt. 30(10) 1263-1273 (1991)