Temporal and spatial evolution of air-spark switch plasma investigated by the Mach–Zehnder interferometer
Huang Jie1, 2, Yang Lin2, †, Zhang Hongchao3, Chen Lei2, Wu Xianying1
       

Electron density distributions at different time superposed with Gaussian fit curves on a common radial coordinate system, which is center around the axes of the arc channels. (a) Electron density distributions at y1 and (b) y2.