关键词：传感器；电弧放电；中断;电子密度；夏克 - 哈特曼；SF6气体
摘 要：Shack-Hartmann type laser wavefront sensors were used for two-dimensional electron density imaging over free-burning SF_6 arcs at current zero in order to experimentally characterise electron density distributions for the success and failure of arc interruption. The success probabilities of the arc interruption were strongly related to not the absolute values of the electron densities but the morphological parameters of the SF_6 arc plasmas at current zero. When the electron density distributions were axially symmetric with respect to the geometrical axis defined by the electrodes, the current interruption failed with a probability of 78%. On the other hand, axially asymmetric electron density distributions demonstrated great interruption performance and the current interruption was successful with a probability of 88%.