中文摘要：

为了获得高强度等离子体以提高放电应用效率，对大气中针板负电晕放电进行了实验研究。通过针板负电晕放电实验得到了发光图像和发射光谱，研究了放电的相对发光强度。结果表明：相对发光强度在针电极方向上的分布分为3段即首先缓慢减弱，随后迅速减弱，最后又缓慢减弱；当电晕发光区不同取样点出现发光时，其相对发光强度随放电电压的加大而都表现出线性增强的趋势；电晕发光区内主要为N2的第二正带系N2（c3П-B3Пg）谱线的相对光谱强度；测量特征峰（其波长为337．nm）谱线的相对光谱强度随放电电压的加大而线性增强，与读取发光图像数据的结果相一致；并且随着放电功率的增加，相对光谱强度的增长逐渐平缓；放电电压加大，电子与气体粒子撞击时间随电子运动速度的加大而减小，激发到高能级的粒子布居数减少，故相对光谱强度与放电功率之比在28kV处有极大值，即此时电源输出能量中用于发光的效率最大，随后又逐渐减小。

英文摘要：

In order to obtain high-strength plasma and improve the application efficiency of discharge, we experimentally researched the negative needle-plate corona discharge in the atmosphere, in which the relative luminous intensity of dis- charges was studied by glowing photos images and emission spectra. According to the results, the relative luminous intensity changes with the distance from needlepoint, and this change could be divided into three stages： firstly a slow re- duction, then a rapid reduction, and finally a slow reduction again. When the sampling points of corona emitted light, their relative luminous intensity increased linearly with the discharge voltage. The glowing area of corona was mainly com- posed of the emission spectra of N2＇s second positive band system N2（c3П-B3Пg）. The relative intensity of characteristic spectral peak at 337.1 nm linearly increased with discharge voltage, which is consistent with the results of glow data, and the relative spectral intensity increased slower gradually with the increase of discharge power. With the in- crease of discharge voltage, electron velocity increases, and hence the time length of strike between electrons and gas particles decreases, which reduce the population number of particles excited to high-energy state. Consequently, the ratio of the relative spectral intensity and the discharge power has a peak at the applied voltage of 28 kV, which indicates the maximum efficiency of tuning the power output into light-emitting, then it decreases with increasing applied voltage.