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Laser induced fluorescence in nanosecond repetitively pulsed discharges for CO2 conversion

机译：激光诱导荧光在纳秒重复脉冲放电中的CO2转换

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A CO2 nanosecond repetitively pulsed discharge (NRP) is a harsh environment for laser induced fluorescence (LIF) diagnostics. The difficulties arise from it being a strongly collisional system in which the gas composition, pressure and temperature, have quick and strong variations. The relevant diagnostic problems are described and illustrated through the application of LIF to the measurement of the OH radical in three different discharge configurations, with gas mixtures containing CO2 + H2O. These range from a dielectric barrier NRP with He buffer gas, a less hostile case in which absolute OH density measurement is possible, to an NRP in CO2+H2O, where the full set of drawbacks is at work. In the last case, the OH density measurement is not possible with laser pulses and detector time resolution in the ns time scale. Nevertheless, it is shown that with a proper knowledge of the collisional rate constants involved in the LIF process, a collisional energy transfer-LIF methodology is still applicable to deduce the gas composition from the analysis of LIF spectra.
机译：CO2纳秒重复脉冲放电（NRP）是激光诱导荧光（LIF）诊断的恶劣环境。困难在于它是一个强烈碰撞的系统，其中气体成分、压力和温度变化迅速且强烈。通过应用LIF测量三种不同放电结构中的OH自由基，以及含有CO2+H2O的气体混合物，描述并说明了相关的诊断问题。这些范围从带有He缓冲气体的介电势垒NRP（在这种情况下，可以进行绝对OH密度测量）到CO2+H2O中的NRP（在这种情况下，存在一整套缺陷）。在最后一种情况下，在ns时间尺度下，使用激光脉冲和探测器时间分辨率无法测量OH密度。然而，研究表明，在适当了解LIF过程中涉及的碰撞速率常数的情况下，碰撞能量转移LIF方法仍然适用于从LIF光谱分析中推断气体成分。

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