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: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/95179dfcc67e4a54bc926b441e08cb44 |
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| Sumario: | 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. |
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