ポッケルス効果を用いた正極性沿面放電進展時の電位分布直接測定

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  • The Direct Potential Distribution Measurement of Propagating Positive Surface Discharge by Using Pockels Effect
  • ポッケルス コウカ オ モチイタ セイキョクセイ エンメン ホウデン シンテンジ ノ デンイ ブンプ チョクセツ ソクテイ

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A new method for measuring the transient potential distribution of insulating material surface on which surface discharge propagates is developed. The measuring system consists of a BGO Pockels crystal, an Ar ion laser, a beam expander, a streak camera and a CCD camera. The potential profile on the BGO crystal plate along a linear path of 50mm in maximum length is measured with high space and time resolution: 50μm and 2ns in minimum resolution. From the measured potential profiles together with the electric field computation, the charge density of a surface discharge can be estimated. The experimental results obtained from the potential distribution measurement of positive surface discharge are summarized as follows: The propagating direction component of electric field in the stem of a positive surface streamer is 8-9kV/cm. The developing velocity of the streamer initially reaches 108cm/s just after its inception and decreases down to 107cm/s while propagating.

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