Tokyo City University
Tokyo City University
Tokyo City University
Tokyo City University
Tokyo City University
Tokyo City University
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料: 第8回宇宙環境シンポジウム講演論文集
雑誌名(英)
JAXA Special Publication: Proceedings of the 8th Spacecraft Environment Symposium
巻
JAXA-SP-11-012
ページ
181 - 185
発行年
2012-02-20
会議概要（会議名, 開催地, 会期, 主催者等）
第8回宇宙環境シンポジウム (2011年10月18-19日. 東京国際展示場), 東京
会議概要（会議名, 開催地, 会期, 主催者等）（英）
8th Spacecraft Enivironment Symposium (October 18-19, 2011, Tokyo Big Sight), Tokyo Japan
抄録（英）
We have developed a surface discharging measurement system, using Pockels effect. Pockels effect is a kind of electro-optic effect. The Pockels effect means that the phase shift of polarized light, which phases through the Pockels device, is proportional to applied electric field to the Pockels device. In this measurement system using Pockels effect, when the light which is produced by LED or LD propagate in the Pockels device, each of two orthogonal components travels different velocities which depend on the refractive index of each component. After the light passing through the Pockels device, a phase shift occurs in the light between the two components. This results in an elliptical polarization of the emerging beam. The degree of the phase shift and the ellipticity depend on the electric field being applied to the Pockels device. Therefore, by observing the distribution of the phase shift of the emerged light from the BSO (Pockels crystal), we can measure the electric field distribution in BSO. In our experiments, we apply an sinusoidal wave voltage to a needle electrode on the sample put on the BSO cell. When the applied voltage makes a surface discharge on the sample by the applied sinusoidal voltage, the charge remained on the sample makes the electric field distribution in the BSO cell. Therefore, by measuring the distribution of the phase shift, we can observe the surface discharge pattrn. In this experiment, the atmosphere pressure around the sample is controlled in the range from 101 kPa to 11 kPa. From those experimental results, we found the patterns on various materials are categorized into two characteristics. Furthermore, we also found that the two characteristics strongly depend on the ionization energy of the materials of the samples.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
宇宙機用絶縁材料における沿面放電観測
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