NDLI: Quantitative measurement of naphthalene in low-pressure flames by jet-cooled laser-induced fluorescence

Content Provider	Springer Nature Link
Author	Wartel, M. Pauwels, J. F. Desgroux, P. Mercier, X.
Copyright Year	2010
Abstract	We have recently developed a new laser based set-up (Jet-Cooled Laser-Induced Fluorescence) for the analysis of aromatic compounds generated in flames. This method relies on the extraction of the species from the flame via a thin microprobe and their direct analysis inside a supersonic free jet by Laser-Induced Fluorescence (LIF). Under the supersonic conditions of the jet, the vibronic spectra of the molecules become structured as the possibility of electronic transitions is reduced, allowing their selective detection by LIF. In addition, due to the very low quenching efficiency inside the jet, LIF signals can be directly related to the population of the probed species and easily calibrated into absolute concentrations. All of the work presented here has been carried out for naphthalene, which is an important PAH involved in soot formation mechanisms. The calibration procedure is described in detail. We also report a detailed study of the quantitative features of the technique, in particular cooling efficiencies and collision rates as well as some additional potential factors that could bias the quantitative aspect of the method. Finally, the possibilities of the technique for the measurement of PAH within flames in the presence of soot particles along with its accuracy and reproducibility are demonstrated by recording naphthalene mole fractions profiles in several rich CH4/O2/N2 flames. A detection limit of the order of a ppb is demonstrated under flame conditions with and without the presence of soot particles.
Starting Page	933
Ending Page	943
Page Count	11
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	100
Issue Number	4
e-ISSN	14320649
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-07-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physics Engineering Optics, Optoelectronics, Plasmonics and Optical Devices Quantum Optics Laser Technology, Photonics Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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