大气压空气纳秒脉冲阵列式线-线SDBD等离子体的电学及发射光谱特性研究  

Electrical and OES Characters of Nanosecond Pulsed Array Wire-to-Wire SDBD Plasma in Atmospheric Air

作　　者：赵紫璐 杨德正[1] 王文春[1] 周雄峰 袁皓 ZHAO Zi-lu;YANG De-zheng;WANG Wen-chun;ZHOU Xiong-feng;YUAN Hao(Key Lab of Materials Modification, Dalian University of Technology, Ministry of Education, Dalian 116024, China)

机构地区：[1]大连理工大学三束材料改性教育部重点实验室,辽宁大连116024

出　　处：《光谱学与光谱分析》2019年第4期1236-1241,共6页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划项目(2016YFC0207200);国家自然科学基金项目(51377014;51407022;51677019)资助

摘　　要：提出了一种阵列式线-线沿面介质阻挡放电结构,利用双极性高压纳秒脉冲电源,在大气压空气中激励产生了相对大面积的放电等离子体。其中,高压电极、地电极均为圆柱形金属,放电反应器由20组相间排列的阵列式线型高压电极和套有介质管的阵列式线型地电极组成。利用电压探头、电流探头、示波器等测量了放电电压和放电总电流,并计算得出了放电的实际电流。利用光纤、光栅光谱仪、 CCD等测量了波长范围在300～440 nm和766～778 nm的发射光谱,即氮分子第二正带N_2(C^3Π_u→B^3Π_g)包括Δν=+1, 0,-1,-2,-3、氮分子离子第一负带N■(B^2Σ^+_u→X^2Σ^+_g), N_2(B^3Π_g→A^3Σ^+_u)和O (3p^5P→3s^5S_2)的发射光谱。比较了氮分子第二正带N_2(C^3Π_u→B^3Π_g)的各个振动峰和各个活性物种的发射光谱强度,以及这些发射光谱强度随着脉冲峰值电压的变化。测量了N_2(C^3Π_u→B^3Π_g, 0-0)的二次、三次衍射光谱,与原始光谱在转动带、背景光谱等方面进行了比较,并计算了二次衍射和原始光谱之间的峰值比。利用氮分子第二正带N_2(C^3Π_u→B^3Π_g,Δν=+1, 0,-1,-2)和氮分子离子第一负带N^+_2(B^2Σ^+_u→X^2Σ^+_g, 0-0)模拟了等离子体的转动温度和振动温度,对模拟结果进行了比较,并研究了脉冲峰值电压对等离子体振动温度和转动温度的影响。通过测量放电的电压和计算得到的放电电流发现,当脉冲峰值电压为22 kV,脉冲重复频率为150 Hz时,阵列式线-线沿面介质阻挡放电的放电电流在正脉冲、负脉冲两个方向上均可达75 A左右。通过诊断放电等离子体的发射光谱发现,在测量的波长范围内,放电产生的活性物种主要有氮分子第二正带N_2(C^3Π_u→B^3Π_g)、氮分子离子第一负带N■(B^2Σ^+_u→X^2Σ^+_g), N_2(B^3Π_g→A^3Σ^+_u)和O (3p^5P→3s^5S_2)。在脉冲峰值电压22～36 kV的变化范围内,氮分子第二正带N_2(C^3Π_u→B^3Π_In this paper, an array wire-to-wire surface dielectric barrier discharge is reported, and discharge plasma with a relative large area is excited by a high-voltage nanosecond pulse power in atmospheric air. The high-voltage and ground electrodes are made of cylindrical metal, and the discharge structure is composed of 20 groups of alternately arranged array high-voltage and ground electrodes covered with dielectric tubes. The applied voltage and total discharge current are measured by high-voltage and current probes, and displayed on oscilloscope. And the discharge current is calculated. The optical emission spectra within the wavelengths of 300~440 and 766~778 nm are measured by fiber, spectrometer, and CCD, namely, the spectra of N2(C3Πu→B3Πg) including the bands of Δν=+1, 0,-1,-2,-3, N2(B2Σ+u→X2Σ+g), N2(B3Πg→A3Σ+u), and O(3p5P→3s5S2). The emission intensities are calculated, and every peak of N2(C3Πu→B3Πg) and four active species are compared. The effects of pulse peak voltage on the emission intensities are also investigated. The second and third diffraction spectra are measured and compared with the original spectra of N2(C3Πu→B3Πg, 0-0) in the aspects of rotational bands and background spectra. The ratios of peak value between the second diffraction and original spectra of N2(C3Πu→B3Πg, 0-0) are calculated. The rotational and vibrational temperatures are simulated and compared by N2(C3Πu→B3Πg,Δν=+1, 0,-1,-2) and N+2(B2Σ+u→X2Σ+g, 0-0), and the effects of pulse peak voltage are investigated. According to the applied voltage and calculated discharge current, the discharge current of array wire-to-wire surface dielectric barrier discharge is about 75 A in both positive and negative directions, when pulse peak voltage is 22 kV and pulse repetition rate is 150 Hz. The optical emission spectra show that the main active species of discharge plasma are N2(C3Πu→B3Πg), N2(B2Σ+u→X2Σ+g), N2(B3Πg→A3Σ+u), and O(3p5P→3s5S2) during measured ranges. During the range of 22~3

关 键 词：沿面介质阻挡放电 大气压放电 纳秒脉冲放电 发射光谱 

分 类 号：O536[理学—等离子体物理]