大气压放电等离子体柱的光谱研究

Spectral Investigation of Atmospheric Pressure Plasma Column

大气压放电等离子体柱在飞行器隐身技术方面具有非常重要的应用。利用同轴介质阻挡放电水电极装置,大气压下在氩气中放电产生了长达65cm的均匀等离子体柱。利用光学方法研究了等离子体柱的放电机理为发光子弹传播。通过测量发现该子弹的传播速度约为0.6×105 m.s-1。采用发射光谱法测量了等离子体柱的发射光谱中谱线强度比随外加电压和驱动频率的变化关系,其相对强度之比表征了电子平均能量。结果表明电子平均能量随外加电压和驱动频率的增加而增加。本工作对大气压下气体放电的工业应用具有一定的意义,在军事飞行器隐身方面具有广阔的应用前景。

Atmospheric pressure plasma column has many important applications in plasma stealth for aircraft. In the present paper, a plasma column with a length of 65 cm was generated in argon at atmospheric pressure by using dielectric barrier dis- charge device with water electrodes in coaxial configurations. The discharge mechanism of the plasma column was studied by op- tica/method and the result indicates that a moving layer of light emission propagates in the upstream region. The propagation ve- locity of the plasma bullet is about 0. 6 × 10^5 m o s i through optical measurement. Spectral intensity ratios as functions of the applied voltage and driving frequency were also investigated by spectroscopic method. The variation in spectral intensity ratio im- plies a change in the averaged electron energy. Results show that the averaged electron energy increases with the increase in the applied voltage and the driving frequency. These results have significant values for industrial applications of the atmospheric pressure discharge and have extensive application potentials in stealth for military aircraft.