| Non-equilibrium plasma can be generated through Dielectric-Barrier-Discharge(DBD)at atmospheric pressure. This manufacturing technique has made great progress in manyfields such as material modification and micro-electronic. The atmospheric DBD operatingwithout vacuum, can be used in industrial production efficiently. So it attracts plenty ofattention in the plasma physical research field. Study on time-domain nonlinear behavior inthe discharge will be of great help to make a better understanding of mechanism dynamicin DBD, providing significant theoretical basis for obtaining stable atmospheric DBD. Toimprove and supplement the existing research subject related to time-domain nonlinearbehavior in atmospheric DBD, this article studies the multi-periodic and chaotic discharge,asymmetric discharge and hysteresis of discharge in atmospheric helium DBD in theexperimentation perspective with theoretic analysis. The main content of this work showsas follows:Firstly, under a certain condition, time-domain nonlinear behaviors as multi-periodand chaos, period-doubling bifurcation into chaos, inverse period-doubling bifurcation areobserved in atmospheric helium DBD experiment. With some nonlinear diagnosis methods,the nonlinear characteristics of discharges are confirmed.Secondly, a series of experiments in atmospheric helium DBD is carried out to studythe evolution of asymmetric discharge. How the width of gas gap and applied voltage makethe asymmetric discharge appear is analyzed. From an experimental viewpoint, therelationship of asymmetric discharge and multi-periodic or chaotic discharge is discussed.Thirdly, the voltage-current curve of discharge is obtained in the experiment. Ahysteresis loop verifies the hysteresis phenomenon in DBD. Shape of hysteresis loops involtage-current curve under different frequencies is compared. The nonlinear phenomenonwith hysteresis includes multi-periodic and chaotic discharge, sudden jumps is studied. |
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