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首页> 外文期刊>Applied optics >MEASUREMENTS OF HYDROXYL CONCENTRATIONS AND LIFETIMES IN LAMINAR FLAMES USING PICOSECOND TIME-RESOLVED LASER-INDUCED FLUORESCENCE
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MEASUREMENTS OF HYDROXYL CONCENTRATIONS AND LIFETIMES IN LAMINAR FLAMES USING PICOSECOND TIME-RESOLVED LASER-INDUCED FLUORESCENCE

机译：使用时间分辨的激光诱导荧光测量层状火焰中的羟浓度和寿命

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摘要

Picosecond time-resolved laser-induced fluorescence (PITLIF) can potentially be used to obtain measurements of minor species concentrations in rapidly fluctuating flames. Previous studies demonstrated this potential for atomic sodium by monitoring the temporal fluorescence signal with both an equivalent-time and a real-time sampling method. In this developmental study, PITLIF is used to determine hydroxyl concentrations in laminar CH4-O-2-N-2 flames by the measurement of both the integrated fluorescence signal and the fluorescence lifetime. The quenching environment can be monitored with real-time sampling, and thus the necessary quenching rate coefficient is obtained in 348 us, which is fast enough for use in many turbulent flows. Fluorescence lifetimes of OH are also measured at different equivalence ratios in laminar flames by the use of the equivalent-time sampling technique. These results compare favorably with predicted lifetimes based on relevant quenching cross sections and calculated species concentrations. (C) 1996 Optical Society of America [References: 67]
机译：皮秒时间分辨激光诱导荧光（PITLIF）可以潜在地用于获取快速波动的火焰中次要物种浓度的测量值。以前的研究通过用等效时间和实时采样方法监测时间荧光信号，证明了这种钠原子的潜力。在这项发展研究中，PITLIF用于通过测量积分荧光信号和荧光寿命来确定层流CH4-O-2-N-2火焰中的羟基浓度。可以通过实时采样监控淬火环境，因此在348 us中即可获得必要的淬火速率系数，该系数足够快，可用于许多湍流。通过使用等效时间采样技术，还可以在层流火焰中以不同当量比测量OH的荧光寿命。这些结果与基于相关淬火截面和计算出的物质浓度的预期寿命相比具有优势。 （C）1996年美国眼镜学会[参考：67]

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