Title :
A study of three-dimensional measurement of pre-breakdown streamer in dielectric liquids
Author :
Otsuki, Shunsaku ; Yamazawa, Kazuaki ; Sugiura, Kenji ; Yamashita, Hisanao
Author_Institution :
Dept. of Electr. Eng., Keio Univ., Yokohama, Japan
Abstract :
This paper presents a new method which visualizes the high-speed three-dimensional (3-D) images of the pre-breakdown streamers in dielectric liquids. A new optical system, having two crossed light axes to observe the needle tip at different directions was designed. The shadowgraphic images from these two directions were combined through a beam splitter and focused on the photo-cathode of an image converter camera (ICC). The photograph taken by this high-speed shadowgraph system was reconstructed into the 3-D images of each frame using an image scanner and a computer. The growth and the decay processes of the streamer in cyclohexane were investigated by using this optical system. A random propagation of a filamentary streamer and actual movements of the bubbles produced by streamer were clearly shown as 3-D figures
Keywords :
dielectric liquids; dielectric measurement; discharges (electric); high-speed optical techniques; organic compounds; bubbles; cyclohexane; dielectric liquid; filamentary streamer; high-speed shadowgraph imaging; image converter camera; optical system; pre-breakdown streamer; three-dimensional measurement; Cameras; Dielectric liquids; Dielectric measurements; High speed optical techniques; Image converters; Image reconstruction; Needles; Optical design; Streaming media; Visualization;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-3851-0
DOI :
10.1109/CEIDP.1997.641157
