单针与针-板喷枪放电特性的比较研究

通过光学与电学测量，对大气压氩气中运行的单针喷枪和针-板喷枪的放电特性进行了研究。结果表明两种喷枪产生等离子体的长度和截面积都随着外加电压峰值(U_p)的增大而增大。相同U_p下针-板喷枪等离子体截面积比单针喷枪大。相同U_p下针-板喷枪放电的外加电压比单针喷枪的低。通过采集两种喷枪放电的发射光谱，对其等离子体的电子温度和振动温度进行了比较。结果发现两种喷枪的电子温度和振动温度均随着U_p的增大而增大，且相同电压下针-板喷枪的温度高于单针喷枪。研究结果对大气压等离子体喷枪的工业应用具有重要价值。

Comparative Investigation of the Discharge Characteristics of a Single Needle Jet and Needle-Plate Jet

In the present paper, discharge characteristics were studied in atmospheric pressure argon by a single needle jet and needle-plate jet through combination of optical measurement and electrical one. Results show that the length and cross-sectional area of the plasmas generated in the two jets increase with increasing the peak value of the applied voltage. The cross-sectional area generated by needle-plate jet is bigger than that of the single needle jet at the same voltage. A lower inception voltage is needed for the needle-plate jet compared with the single needle jet at the same U_p. Through the spectra emitted from the two jets, electron temperature and vibration temperature wee compared for the plasmas generated by the single needle jet and needle-plate jet, respectively. It can be found that the electron temperature and the vibrational temperature of the two jets increase with increasing U_p. The needle-plate jet has higher values of electron temperature and vibrational temperature than the single needle jet at the same U_p. These results have significant values for the industrial application of the atmospheric pressure plasma jet.