Laser-induced breakdown characteristics of nonuniform dc corona discharge fields

Author

Takahashi, Akihiko ; Nishijima, Kiyoto

Author_Institution

Dept. of Electr. Eng., Fukuoka Univ., Japan

Volume

1

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

590

Lastpage

596

Abstract

Laser-induced breakdown of nonuniform field gaps in atmospheric air was caused by an XeCl excimer laser. This laser beam was focused on the center of a rod-to-plane, needle-to-plane or hemisphere-to-plane gap with dc voltage. The laser energy dependency of breakdown voltage was investigated for positive and negative applied voltages and gap lengths of 15 to 25 mm. It was found that the positive breakdown voltage was higher than the negative one in the hemisphere-to-plane gaps or the rod-to-plane gaps with low voltages, where there is little or no space charge. However, the effect of polarity is reversed in the rod-to-plane gaps with large spacings and the needle-to-plane gaps. On the basis of the dependence of the discharge mode on this polarity effect, it can be seen that it was caused by the difference in development of positive and negative streamers in the corona discharge

Keywords

arcs (electric); corona; electric breakdown of gases; excimer lasers; laser beam applications; spark gaps; 15 to 25 mm; XeCl excimer laser; atmospheric air; discharge mode; hemisphere-to-plane gap; laser-induced breakdown characteristics; needle-to-plane gap; negative applied voltages; negative streamers; nonuniform dc corona discharge fields; nonuniform field gaps; positive applied voltages; positive streamers; rod-to-plane gap; Breakdown voltage; Corona; Electric breakdown; Electrodes; Gas lasers; Laser beams; Laser modes; Lightning; Plasmas; Space charge;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.311727

Filename

311727