Uniform and non-uniform modes of nanosecond-pulsed dielectric barrier discharge in atmospheric air: fast imaging and spectroscopic measurements of electric fields

Abstract

In this study, we report experimental results on fast ICCD imaging of development of nanosecond-pulsed dielectric barrier discharge (DBD) in atmospheric air and spectroscopic measurements of electric field in the discharge. Uniformity of the discharge images obtained with nanosecond exposure times were analyzed using chi-square test. The results indicate that DBD uniformity strongly depends on applied (global) electric field in the discharge gap, and is a threshold phenomenon. We show that in the case of strong overvoltage on the discharge gap (provided by fast rise times), there is transition from filamentary to uniform DBD mode which correlates to the corresponding decrease of maximum local electric field in the discharge.

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“…This pulse generator provided a 1-10 ns pulse width with a rise time of 5 kV/ns between the dielectric barrier electrodes [51]. The power supply provides an adjustable frequency of 500 Hz to 1.5 kHz with a maximum amplitude of 20 kV.…”

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“…Being recognized as fast‐rising but short duration, high voltage pulse power is an effective candidate to restrict the discharge mode transition . The fast‐rising time results in a high rate of variation of voltage ( dV / dt ) in the gas gap, and free electrons are greatly accelerated, leading to the fast ionization and uniform discharge . Meanwhile, the energy of the pulse power is consumed for generating active species, instead of heating gas, and thermal instability of the gas–liquid discharge can be avoided .…”

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