TP-LIF技术测量甲烷-空气火焰中CO的相对浓度分布
Detection of CO concentration in a methane-air flame by TP-LIF
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摘要: 阐述了双光子激光诱导荧光(TP-LIF)技术的原理及线性模型，利用双光子过程激励CO分子B1∑+←←X1∑＋(0,0)带Q支的跃迁(约230 nm)，分析了B1∑+→A1Π荧光带的荧光光谱特性，探讨了激光功率密度、激光波长及火焰温度等因素对测量的影响，并给出甲烷-空气火焰在一定燃烧条件下CO分子浓度随火焰位置及高度的变化关系。实验结果表明，利用TP-LIF技术测量CO的浓度分布，其时空分辨率及探测灵敏度都很高。当激光功率密度较强时，TP-LIF信号和激光能量成线性关系，而且由于光电离速率的增强，大大降低了碰撞猝灭速率等环境因素对信号测量造成的影响，该特性对实验标定及定量测量都非常有帮助。Abstract: The principle and the linear model of two photo laser induced flluorescence(TP-LIF) were presented and discussed in this paper. The CO Q-branch (0,0) band of the B1∑+←←X1∑＋ transition was excited near 230 nm and the B1∑+→A1Π band fluorescence was detected at around 483nm. Through the analysis of the fluorescence spectrum and intensity, the effects of laser intensity, laser wavelength and the temperature on measurement were discussed. Finally the CO distribution was measured in a methane-air flame, which shows a good agreement with the results measured by other method. It was demonstrated that in the linear model of TP-LIF, the quenching effects and the other effects can be avoided. TP-LIF can be used to detect the minor species concentration conveniently.
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Key words:
- two photo laser induced flluorescence(tp-lif) /
- lif /
- co /
- laser diagnostics /
- combustion diagnostics
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