Detection of OH in an atmospheric flame at 1.5 um using optical frequency comb spectroscopy

Lucile Rutkowski, Alexandra C. Johansson, Damir Valiev, Amir Khodabakhsh, Arkadiusz Tkacz, Florian M. Schmidt, Aleksandra Foltynowicz

Abstract


We report broadband detection of OH in a premixed CH4/air flat flame at atmospheric pressure using cavity-enhanced absorption spectroscopy based on an Er:fiber femtosecond laserand a Fourier transform spectrometer.By taking ratios of spectra measured at different heights above the burner we separate twenty OH transitions from the largely overlapping water background. Weretrieve from fits to the OH lines the relative variation of the OH concentration and flame temperature with height above the burner and compare them with 1-D simulations of the flamestructure.

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
Published in cooperation with SPIE

ISSN: 2080-2242