大気中正極性沿面ストリーマの同期発生

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This report deals with the experimental results of synchronized generation of creeping streamers. Two parallel spherical electrodes are placed on a insulator plate. A shading plate or a optical filter is located at the middle point of the electrodes. Lightning impulse voltage is applied to the electrodes. Applied voltage, current to the ground and surface dust figures on the insulator are recorded. This observation is repeated up to a hundred times and synchronization probabilities of two streamers started from several electrode are obtained. Without the shading plate or the optical filter between electrodes, two streamers are mostly synchronized. However, the shading plate is located, the probability decreases remarkably. The probability rapid increases again when the insulator is irradiated by ultraviolet light. In the case of the optical filters are used, the probabilities can be observed as a function of wavelength of discharge light. The probabilities are almost 100% with high-pass filter of 115 nm cutoff. This high probability is maintained until cutoff wavelength reaches 250 nm. After that, the probability sharply declines. The synchronization is induced by ultraviolet light from first streamers. Because the ultraviolet light irradiates the insulator and photoelectrons are generated as initial electrons, second streamers start from another electrode. Required energy for the synchronization is above 5eV that corresponding to wavelength of 250 nm. Not only UV region, but also the light of VUV region is effective for the synchronization.
社団法人電気学会の論文
2004-02-01

大気中正極性沿面ストリーマの同期発生

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