In order to learn the discharge characteristics of dielectric barrier discharge with low flow rate under atmosphere pressure with argon

by means of taking discharge photographs

performing spectral analysis

measuring discharge waveform

and so on

the DBD characteristics with low flow rate in argon at atmospheric pressure was investigated. The effects of discharge voltage

frequency

gas discharge gap

and air flow rate were also investigated. The results show that the rise of applied voltage and frequency can improve the discharge homogeneity. And it can get more energetic electrons when the applied voltage increases. With the increase of frequency

the distribution of energetic electrons will change

the density of electrons with higher energy will increase

and the density of electrons with lower energy will decrease. With the decrease of air gap

the discharge uniformity will increase. With the increase of air flow rate

the intensity of discharge weakens

whereas the uniformity of discharge increases.