直流激励的大气压氩气喷枪的光谱研究

利用正高压驱动空心针-板喷枪装置，通入工作气体氩气，在大气压空气中产生了均匀稳定的喇叭状等离子体羽。电学和光学测量结果表明，放电虽然是在直流电源驱动下工作，但放电为周期性的脉冲。通过对等离子体羽发光信号进行空间分辨测量，研究了脉冲的形成机理，发现除针尖附近的电晕放电外，等离子体羽是以正流光(等离子体子弹)从针尖向着接地电极方向传播的。采用光谱学方法，对电子激发温度随电压的变化及其空间分布进行了测量。结果表明，电子激发温度(约为3 eV)随电压的增大而升高，在一定电压下，电子激发温度沿气流方向也在升高。

Spectroscopic Study on a Direct-Current Driving Plasma Jet in Argon at Atmospheric Pressure

With a discharge device in a hollow‐needle and plate electrode configurations ,an atmospheric pressure uniform plasma plume is generated by DC voltage excitation in the ambient air with argon as working gas .The plasma plume is a pulsed dis‐charge despite a direct current voltage is applied through measurements by optical and electrical methods .In order to explain the formation mechanism of the pulse ,spatially resolved signals emitted from the plume were detected .It was found that the plasma plume denoted as the luminous layer propagates (a plasma bullet) from the hollow needle to the plate electrode except for the co‐rona discharge in the vicinity of the hollow needle tip .Optical emission spectroscopy is used to investigate the excited electron temperature of the plasma plume as a function of the applied voltage or the spatial distribution of the excited electron tempera‐ture .The results show that the excited electron temperature (about 3 eV) increases with increasing applied voltage .Moreover , it increases with the increasing distance along the gas flow under constant voltage .