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The characteristic of sparkover in a DC inhomogeneous field gap, is closely related with the discharge mode at the onset time of corona. In order to investigate the transitional mechanism from burst corona to glow corona or streamer corona, the discharge experiment which is controlled by a pulse laser in N2/NO mixture have been done. From the high sensitive observation of discharge luminesence which corresponds respectively to the discharge current wave, the transition from burst corona to streamer corona, is decided by the electron avalanche, which is formed initially at the tip of rod electrode with the highest electric field, and the effect of secondary ionization. Moreover, it is verified that the measured electron burst drift time with laser irradiation in the discharge gap is decided by the electric field of the discharge gap.

Laser-Induced Burst Corona and Streamer Corona for a PositiveDC Non-uniform Field Gap in N2/NO Mixtures