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研究了 SF6 - N2 混合气在四倍频 Nd:YAG激光脉冲作用下的触发特性。实验结果表明 :充 SF6 -N2 混合气的火花隙的触发延迟和抖动、最低可触发阈值随充气压力及混合气中 SF6 含量上升而上升 ,随激光波长减小而减小 ,火花隙的触发延迟和抖动随焦距的减小而减小。由于 SF6 - N2 混合气的介电强度、触发延迟和抖动与混合气中 SF6 含量之间均存在非线性关系 ,作为开关工作介质 ,SF6 - N2 混合气的综合性能较好的 SF6含量范围是 5 %～ 4 5 %。
The ignition characteristics of SF6 - N2 mixture under fourfold frequency Nd: YAG laser pulse were studied. The experimental results show that the ignition delay and jitter of the spark gap filled with SF6-N2 mixture increase with the inflation pressure and the content of SF6 in the mixture, and decrease with the decrease of the laser wavelength. The ignition delay of the spark gap And jitter decreases with decreasing focal length. Due to the non - linear relationship between dielectric strength, ignition delay and jitter of SF6 - N2 mixture and the content of SF6 in the mixture, SF6 - N2 mixture has better SF6 content as a working medium for switching. % ~ 45%.