中文摘要：

大气压低温等离子体医学应用需要设计人体可安全接触的低温等离子体源。本文设计了一种环环电极结构的大气压低温等离子射流装置,通过合理地设计其绝缘结构和选择运行条件,在He中产生了人体可接触的大气压低温等离子体射流。通过发光图像拍摄、光谱分析以及电气特性测量等手段,诊断所设计装置的特性;通过人体实际接触实验,证实了其安全性,并通过建立装置的等效电气模型对其人体接触安全性进行理论分析。结果表明,本文设计射流的放电具有稳定、安全、低功率的特点,其放电电流峰值不超过7 m A,放电功率小于1.5 W,最大传输电荷约为100 n C,产生的粒子包含大量OH与O等高能活性粒子。电源电压为4 k V时,人体上电压降约为35 V,小于人体安全电压。

英文摘要：

A novel type of atmospheric pressure,low temperature helium plasma-jet was developed,based on dielectric barrier discharge（DBD）,to meet the medical demands. The original work involves the two ring-shaped copper elec- trodes, 15 mm in diameter and 10 rnm in separation, embedded on the upper part of the Tyflon rod with a 2 mm quartz glass tube inserted through the rod＇s axis and acting as the dielectric barrier and He-path. The electrodes assembly was housed and insulated by a cylindrical Teflon wall. The characteristics of the plasma-jet were diagnosed by evaluating its e- mission spectra. Moreover, the impact of the plasma irradiation on human skin was modelled, simulated and tested. The re- suits show that the steady ,low powered, non-thermal plasma-jet is absolutely safety to human body. To be specific, pow- ered at 4 kV, the contact voltage between the plasma-jet and human body was below 35 V,much lower than the human se- curity voltage. Its properties include a peak discharge current below 7 mA,a discharge power below 1.5 W,a maximum charge transfer about 100 nC;and the active particles include harmless electrons and radicals of OH and O.