基于激光诱导荧光法诊断大气压低温等离子体射流中OH自由基和O原子的时空分布

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摘要由于传统辐射光谱法无法对大气压低温等离子体射流中OH自由基和O原子进行定量检测,本文利用自主研制的纳秒脉冲激励针筒型等离子体射流装置,基于单光子和双光子激光诱导荧光法分别对OH自由基和O原子的时空分布进行诊断。结果发现,OH自由基和O原子的寿命时间分别为1ms和3ms,远大于脉冲放电持续时间;采用拟合衰减曲线法,得到OH自由基的绝对密度为10¹²~10¹³cm^-3;发现离喷嘴口越远,OH自由基和O原子密度越低。然而,即使距离喷嘴口数cm的地方,仍然存在大量的OH自由基和O原子;OH自由基和O原子的密度随激励频率和脉冲电压幅值的增加而升高,随H₂O含量和O₂含量的升高而出现先增大后减小的趋势。其中,当氦气中H₂O含量为0.012%时,OH自由基密度达到最大值。当氦气中O₂含量为0.5%时,O原子密度达到最大值。本文研究为调控和优化低温等离子体射流中OH自由基和O原子密度提供重要科学依据。

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关键词 ：大气压低温等离子体射流, 激光诱导荧光, 活性粒子, 等离子体医学, OH自由基, O原子, 等离子体活性

Abstract：The method of traditional optical emission spectroscopy is not suitable for the quantitative measurements of the density of OH radical and O atom in low temperature plasma jets at atmospheric pressure. Thus, this paper applied the single-photon laser induced fluorescence (LIF) and two-photon absorption laser induced fluorescence (TALIF). The plasma jet with needle-cylinder electrode structure was excited by nanosecond pulsed power supply. ①OH radical and O atom in the plasma jet have a lifetime of 1 ms and 3ms, respectively. They are much longer than the duration time of pulse discharge. ②By fitting the decay curve of fluorescence intensity of OH radical vs time, the absolute density of OH radical is estimated to be 10¹²~10¹³cm^-3. ③The densities of both active species decrease monotonically with the increase of the axial distance along the jet. However, it's surprising to observe that there are still a large amount of active species at even several cm far away from the jet nozzle. ④The increased excitation frequency and pulse voltage result in the increased density of active species. Moreover, with the increase of the concentration of H₂O impurities in helium gas, OH radical density decreases after reaching a maximum value at 2.7×10¹³cm^-3 for H₂O concentration of 120 ppm. The behavior of O atom density shows the same tendency with the increase of O₂ percentage in helium. The inflection point corresponding to the peak density of O atom occurs at the O₂ percentage of 0.5%. This study provides an important scientific basis for regulation and optimization of the densities of OH radicals and O atom in low temperature plasma jets.

Key words： Atmospheric-pressure low-temperature plasma jets, laser induced fluorescence, active species, plasma medicine, OH radicals, O atom, plasma activity

收稿日期: 2016-05-29 出版日期: 2017-05-02

PACS:

TM835.4

基金资助:国家自然科学基金（51077063、51607090）,江苏省自然科学基金（BK20160796）和校人才引进基金（90YAH15059）资助项目

作者简介: 吴淑群男,1988年生,博士,副教授,研究方向为高压放电与等离子体、等离子体诊断及其应用。E-mail: wushuqun@nuaa.edu.cn（通信作者）;董熙男,1993年生,硕士研究生,研究方向为大气压等离子体射流。E-mail: dongxi@nuaa.edu.cn

引用本文:

吴淑群, 董熙, 裴学凯, 岳远富, 卢新培. 基于激光诱导荧光法诊断大气压低温等离子体射流中OH自由基和O原子的时空分布[J]. 电工技术学报, 2017, 32(8): 82-94. Wu Shuqun, Dong Xi, Pei Xuekai, Yue Yuanfu, Lu Xinpei. Laser Induced Fluorescence Diagnostics of the Temporal and Spatial Distribution of OH Radicals and O Atom in a Low Temperature Plasma Jet at Atmospheric Pressure. Transactions of China Electrotechnical Society, 2017, 32(8): 82-94.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I8/82

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