College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Opt Lett. 2013 Apr 15;38(8):1250-2. doi: 10.1364/OL.38.001250.
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.
利用飞秒丝状诱导非线性光谱技术实现了对多种燃烧中间产物的同步监测。在酒精燃烧器上的层流乙醇/空气火焰中形成飞秒丝状时，观察到自由基 CH、CN、NH、OH 和 C(2)以及原子 C 和 H 的清洁荧光发射。这些物质的荧光信号被发现随丝状与火焰在中央燃烧流的垂直轴上的相互作用位置的变化而变化，为通过飞秒激光丝状的激发实现发动机的远程燃烧诊断开辟了可能性。
