短间隙空气放电的光信息研究

Study on Optical Information of Short Gap Air Discharge

气体放电过程中,发光是最明显也是最基本的一种物理现象。放电通道之所以发出光来,正是由于粒子跃迁的结果。相对于其他测量放电流注的方法而言,采集光信号的方法是非接触式测量,不受电场、磁场的影响,具有选择性好、灵敏度高、易操作、高准确度、对放电系统无干扰等诸多优势。采用采集光信号的方法研究短间隙下空气的放电发光现象。在标准大气压下,分别对空气中不同间距下的棒-板电极、尖-尖电极进行了放电实验,分别采集了空气在短间隙棒-板电极和尖-尖电极放电瞬间的光信号,能够得到流注放电随着所加电压增高而增强,随着所加电压的不断升高,流注棒电极头部放电区域不断增大,并依据实验结果计算了电子温度及电子浓度。

During the process of gas discharge,luminescence is the most obvious and basic physical phenomenon.As a result of particle transition,the discharge channel glows.Compared with other methods for measuring discharge streamers,the method for collecting optical signals is a non-contact measurement and is not affected by electric field and magnetic field.It has many advantages such as good selectivity,high sensitivity,easy operation,high accuracy and no interference to the discharge system.The method of collecting optical signals is used to study the discharge luminescence of air in short gaps.Under standard atmospheric pressure,discharge experiments were carried out on rod-plate electrodes and tip-tip electrodes at different intervals in air.Optical signals of air at the discharge instant of short-gap rod-plate electrodes and tip-tip electrodes were collected respectively.It can be obtained that streamer discharge increases with the increase of applied voltage.With the increase of applied voltage,the discharge area at the head of streamer rod electrode increases continuously,and the electron temperature and electron concentration are calculated according to the experimental results.