直流激励等离子体喷枪的发光特性研究  

Study on Discharge Characteristics of a Direct Current-Voltage Excited Plasma Jet

作　　者：李雪辰[1] 楚婧娣 鲍文婷[1] 张琦[1] 贾鹏英[1] 

机构地区：[1]河北大学物理科学与技术学院,河北省光电信息材料重点实验室,河北保定071002

出　　处：《光学学报》2015年第7期41-46,共6页Acta Optica Sinica

基　　金：国家自然科学基金项目(10805013,51077035);教育部科技研究重点项(210014);河北省杰出青年基金(A2012201045);河北省自然科学基金项目(A2011201132);河北省教育厅优秀青年项目(T2011120);河北大学青年基金(2011Q14);中西部高校综合实力提升工程(10805013)

摘　　要：利用针-板喷枪装置,在直流电压激励下产生了大气压非平衡态低温等离子体羽。采用光学方法,研究发现等离子体羽的放电模式为脉冲放电。通过比较放电的总发光信号、337.1 nm谱线的发光信号与电流信号,发现电流信号脉冲宽度最大,337.1 nm谱线的信号脉冲宽度最小。通过对发光信号频率随电压的变化关系进行研究,发现放电脉冲频率随电压的增大而增大。利用光谱仪测量了337.1 nm的谱线强度,发现它随气流增大减小,随电压增大表现为先增大后减小。利用气体放电理论,对以上物理现象进行了定性解释。这些研究结果对于大气压非平衡态低温等离子体羽的产生和应用都具有重要意义。A needle-copper plate device excited by a direct current（DC） voltage is used to produce a nonequilibrium low temperature plasma plume at atmospheric pressure. Through optical method, it is found that the plasma plume discharge is pulsed. The total light emission signal is compared with the emission signal of337.1 nm spectral line and the discharge current signal, it is found that the pulse duration is the largest for the current signal, and it is the smallest for the emission signal of 337.1 nm spectral line. Furthermore, the discharge frequency is studied, and results show that the discharge frequency increases with increasing the applied voltage. By using a spectrometer, the intensity of 337.1 nm spectral line decreases with increasing gas flow rate. It increases firstly and then decreases with the increasing the voltage. All of these physical phenomena mentioned above are analyzed qualitatively by gas discharge mechanism. These findings are of great importance for the generation and applications of non-equilibrium low temperature plasma plume generated at atmospheric pressure.

关 键 词：物理光学 等离子体喷枪 等离子体羽 谱线强度 脉冲宽度 

分 类 号：O432.1[机械工程—光学工程] O461.21[理学—光学]