Time-resolved measurements of NO2 concentration in pulsed discharges by high-sensitivity cavity ring-down spectroscopy
Time-resolved measurements of NO2 concentration in pulsed discharges by high-sensitivity cavity ring-down spectroscopy
复制标题
通过高灵敏度腔衰荡光谱法对脉冲放电中 NO2 浓度进行时间分辨测量
DOI：
10.1088/2058-6272/aa6473
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发表时间：
2017
影响因子：
1.7
通讯作者：
Ding Hongbin
中科院分区：
文献类型：
--
作者：
Wu Xingwei;Li Cong;Feng Chunlei;Wang Qi;Ding Hongbin
为了描述二氧化氮（NO2）生成和破坏机理的复杂动力学，对放电区域NO2的实时和原位分析的需求越来越大。脉冲腔衰荡光谱（CRDS）提供了一个很好的诊断方法。在本文中，CRDS已被应用于现场的NO2浓度的时间演变的测量，这是很少在气体放电研究。在NO2/Ar混合物的脉冲直流放电中，在500 Pa的压力、-1300 V的峰值电压和30 Hz的频率下，对于较高的初始NO2浓度，（3.05 × 1014 cm-3，8.88 × 1013 cm-3）时，NO2浓度在放电余辉开始时急剧降低，然后几乎恒定，随着脉冲宽度的增加，NO2浓度下降的速度加快;但是，对于较低的NO2初始浓度（1.69 × 1013 cm−3），在200 ns和1 μs脉冲宽度下，NO2浓度在放电余辉开始时也下降，而在2 μs脉冲宽度下，NO2浓度略有增加，然后下降。因此，低水平的NO2的去除不能促进由较高的平均能量输入。
To describe the complex kinetics of formation and destruction mechanism of nitrogen dioxide (NO2), there is an increasing demand for real-time and in situ analysis of NO2 in the discharge region. Pulsed cavity ring-down spectroscopy (CRDS) provides an excellent diagnostic approach. In the present paper, CRDS has been applied in situ for time evolution measurement of NO2 concentration which is rarely investigated in gas discharges. In pulsed direct current discharge of NO2/Ar mixture at a pressure of 500 Pa, a peak voltage of −1300 V and a frequency of 30 Hz, for higher initial NO2 concentration (3.05 × 1014 cm−3, 8.88 × 1013 cm−3), the NO2 concentration sharply decreases at the beginning of the discharge afterglow and then becomes almost constant, and the pace of decline increases with pulse duration; however, for lower initial NO2 concentration of 1.69 × 1013 cm−3, the NO2 concentration also decreases at the beginning of the discharge afterglow for 200 ns and 1 μs pulse durations, while it slightly increases and then declines for 2 μs pulse duration. Thus, the removal of low-level NO2 could not be promoted by a higher mean energy input.