Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament

Femtosecond lasers have been used in combustion diagnostics. Based on the characteristics of femtosecond laser filamentation, many diagnostic techniques have been developed. Here, we propose a method, based on femtosecond laser filamentation, for equivalence ratio measurements in CH<sub>4</...

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Autores principales:	Ming Li, Jiangpeng Gu, Dayuan Zhang, Qiang Gao, Bo Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	femtosecond laser equivalence ratio spatially resolved spectrum Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/95179dfcc67e4a54bc926b441e08cb44
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spelling	oai:doaj.org-article:95179dfcc67e4a54bc926b441e08cb442021-11-25T18:51:33ZEquivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament10.3390/pr91120222227-9717https://doaj.org/article/95179dfcc67e4a54bc926b441e08cb442021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/2022https://doaj.org/toc/2227-9717Femtosecond lasers have been used in combustion diagnostics. Based on the characteristics of femtosecond laser filamentation, many diagnostic techniques have been developed. Here, we propose a method, based on femtosecond laser filamentation, for equivalence ratio measurements in CH<sub>4</sub>/air gases. By measuring the spatially resolved spectra of the femtosecond laser-induced filament, we found that the variation of the equivalence ratio in the flow field would affect the spatial distribution of the emission intensity of femtosecond laser-induced filament. On this basis, the equivalence ratio was calibrated by using the relative spatial positions of N<sub>2</sub> (337 nm) and C<sub>2</sub> (516.5 nm) signals in the filament. This method overcomes the interference of local air disturbance, having lower measurement uncertainty.Ming LiJiangpeng GuDayuan ZhangQiang GaoBo LiMDPI AGarticlefemtosecond laserequivalence ratiospatially resolved spectrumChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 2022, p 2022 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	femtosecond laser equivalence ratio spatially resolved spectrum Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	femtosecond laser equivalence ratio spatially resolved spectrum Chemical technology TP1-1185 Chemistry QD1-999 Ming Li Jiangpeng Gu Dayuan Zhang Qiang Gao Bo Li Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
description	Femtosecond lasers have been used in combustion diagnostics. Based on the characteristics of femtosecond laser filamentation, many diagnostic techniques have been developed. Here, we propose a method, based on femtosecond laser filamentation, for equivalence ratio measurements in CH<sub>4</sub>/air gases. By measuring the spatially resolved spectra of the femtosecond laser-induced filament, we found that the variation of the equivalence ratio in the flow field would affect the spatial distribution of the emission intensity of femtosecond laser-induced filament. On this basis, the equivalence ratio was calibrated by using the relative spatial positions of N<sub>2</sub> (337 nm) and C<sub>2</sub> (516.5 nm) signals in the filament. This method overcomes the interference of local air disturbance, having lower measurement uncertainty.
format	article
author	Ming Li Jiangpeng Gu Dayuan Zhang Qiang Gao Bo Li
author_facet	Ming Li Jiangpeng Gu Dayuan Zhang Qiang Gao Bo Li
author_sort	Ming Li
title	Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
title_short	Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
title_full	Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
title_fullStr	Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
title_full_unstemmed	Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament
title_sort	equivalence ratio measurements in ch<sub>4</sub>/air gases based on the spatial distribution of the emission intensity of femtosecond laser-induced filament
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/95179dfcc67e4a54bc926b441e08cb44
work_keys_str_mv	AT mingli equivalenceratiomeasurementsinchsub4subairgasesbasedonthespatialdistributionoftheemissionintensityoffemtosecondlaserinducedfilament AT jiangpenggu equivalenceratiomeasurementsinchsub4subairgasesbasedonthespatialdistributionoftheemissionintensityoffemtosecondlaserinducedfilament AT dayuanzhang equivalenceratiomeasurementsinchsub4subairgasesbasedonthespatialdistributionoftheemissionintensityoffemtosecondlaserinducedfilament AT qianggao equivalenceratiomeasurementsinchsub4subairgasesbasedonthespatialdistributionoftheemissionintensityoffemtosecondlaserinducedfilament AT boli equivalenceratiomeasurementsinchsub4subairgasesbasedonthespatialdistributionoftheemissionintensityoffemtosecondlaserinducedfilament
_version_	1718410661218746368

Equivalence Ratio Measurements in CH<sub>4</sub>/Air Gases Based on the Spatial Distribution of the Emission Intensity of Femtosecond Laser-Induced Filament

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