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
       

The 3D electron density distribution extracted from the phase shift distribution at different delay time: (a) 0 ns, (b) 10 ns, (c) 75 ns, (d) 130 ns, (e) 240 ns, (f) 420 ns.