Sensing combustion intermediates by femtosecond filament excitation

Simultaneous monitoring of multiple combustion intermediates using femtosecond filament-induced nonlinear spectroscopy is demonstrated. Clean fluorescence emissions from free radicals CH, CN, NH, OH, and C(2), as well as atomic C and H, are observed when a femtosecond filament is formed in the lamin...

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Bibliographic Details
Published in:Optics letters 2013-04, Vol.38 (8), p.1250-1252
Main Authors: Li, He-Long, Xu, Huai-Liang, Yang, Bo-Si, Chen, Qi-Dai, Zhang, Tao, Sun, Hong-Bo
Format: Article
Language:English
Subjects:
Combustion
Diagnostic systems
Ethyl alcohol
Excitation
Femtosecond
Filaments
Fluorescence
Free radicals
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Summary:Simultaneous monitoring of multiple combustion intermediates using femtosecond filament-induced nonlinear spectroscopy is demonstrated. Clean fluorescence emissions from free radicals CH, CN, NH, OH, and C(2), as well as atomic C and H, are observed when a femtosecond filament is formed in the laminar ethanol/air flame on an alcohol burner. The fluorescence signals of these species are found to vary as functions of the position of interaction of the filament with the flame along the vertical axis of the central combusting flow, opening up a possibility for remote combustion diagnostic in engines by the excitation of femtosecond laser filament.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.38.001250