Because the most part of the spectrum emitted by streamer is in the 300

4

00 nm band

in order to study one of the most important characteristics of streamers

we set up an experiment platform to measure the streamer propagation velocity based on photomultiplier. Two photomultipliers with two 1-mm narrow slits

respectively

in front of them were placed vertically in the axis of rod-plate

one aligning the head of rod electrode

and the other aligning some distance to the rod electrode. With the experiment platform

velocities under two situations were measured. One situation was that the rod electrode applied with a DC voltage and the streamer propagation velocity was measured under the different rod electrode radius and gap length; the other was that the rod electrode was applied with different amplit

udes of 1.2/50 μs impulse voltage and the streamer propagation velocity was measured under different amplitudes of impulse voltage. According to the measurement results

whether the applied voltage is a DC voltage or an impulse voltage

the streamer propagation velocity increases as the applied voltage increases and especially under the second occasion

in the range of 138

2

80 k V experimented impulse voltage

streamer propagation velocity also increases from 111.1 cm/μs to 222.2 cm/μs

which almost linearly increases as the applied voltage increases.