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
       

Two reference locations y1 and y2, which are located near the electrodes. The distance between the reference position and the electrode tip is about 100 μ m . (a) The interferogram obtained at t = 0 ns, and two reference locations y1 and y2 are illustrated with two red solid lines. (b) The radial electron density distribution at t = 0 ns at y1.