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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (11): 115403.

• Low Temperature Plasma •

### Volume added surface barrier discharge plasma excited by bipolar nanosecond pulse power in atmospheric air: optical emission spectra influenced by gap distance

Zilu ZHAO (赵紫璐), Dezheng YANG (杨德正), Wenchun WANG (王文春), Hao YUAN (袁皓), Li ZHANG (张丽) and Sen WANG (王森)

1. Key Lab of Materials Modification, Dalian University of Technology, Ministry of Education, Dalian 116024, People’s Republic of China
• Received:2018-01-02 Published:2018-05-29
• Supported by:

This work is supported by National Key R&D Program of China (2016YFC0207200), and National Natural Science Foundation of China (Nos. 51377014, 51407022 and 51677019).

Abstract:

In this paper, volume barrier discharge with different gap distances is added on the discharge border of high-voltage electrode of annular surface barrier discharge for generating volume added surface barrier discharge (V-SBD) excited by bipolar nanosecond high-voltage pulse power in atmospheric air. The excited V-SBDs consist of surface barrier discharge (d=0 mm) and volume added surface barrier discharges (d=2 mm and 3 mm). The optical emission spectra are recorded for calculating emission intensities of N2 (C 3u →B3Πg ) and N2+ (B 2 Σu+ → X 2Σg+ ), and simulating rotational and vibrational temperatures. The influences of gap distance of V-SBD on emission intensity and plasma temperature are also investigated and analyzed. The results show that d=0 mm structure can excite the largest emission intensity of N 2 (C 3 Πu →B 3Πg ), while the existence of volume barrier discharge can delay the occurrence of the peak value of the emission intensity ratio of N2+ (B 2 Σu+ → X 2 Σg+ )/N 2(C3Πu →B3Πg ) during the rising period of the applied voltage pulse and weaken it during the end period. The increasing factor of emission intensity is effected by the pulse repetition rate. The d=3 mm structure has the highest threshold voltage while it can maintain more emission intensity of N2(C3 Π u →B 3Πg ) than that of d=2 mm structure. The structure of d=2 mm can maintain more increasing factor than that of the d=3 mm structure with varying pulse repetition rate. Besides, the rotational temperatures of three V-SBD structures are slightly affected when the gap distance and pulse repetition rate vary. The vibrational temperatures have decaying tendencies of all three structures with the increasing pulse repetition rate.