Kerr electro-optic measurements of space charge effects in HV pulsed propylene carbonate
Kerr electro-optic measurements of space charge effects in HV pulsed propylene carbonate
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DOI：
10.1109/tdei.2002.1038666
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发表时间：
2002-12
影响因子：
3.1
通讯作者：
Anders Helgesonl;M. Zahn
中科院分区：
文献类型：
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作者：
Anders Helgesonl;M. Zahn
采用克尔电光场成像技术研究了高压脉冲碳酸亚丙酯（C/sub 4/H/sub 6/O/sub 3/）中的空间电荷效应。本文所示的测量是在室温（T /spl sim/ 20至27/spl deg/C）下使用具有对准偏振器的圆偏振镜进行的。平行平面电极的平均峰值空间无电荷电场强度为E/sub 0/ /spl sim/ 52 kV/cm，刀形电极头端的平均峰值空间无电荷电场强度为E/sub 0/ /spl sim/ 210 kV/cm，点电极头端的平均峰值空间无电荷电场强度为E/sub 0/ /spl sim/ 240 kV/cm。测量时间范围为10 /spl mu/s至1 ms。对于平行平面电极，分析了沿着电极间隙中心电极之间的线的光强度图片，对于刀片-平面和点-平面电极，分析了从刀片尖端和点到平面以及沿着平面表面的光强度图片。从平行平面和叶片平面电极的光强分布，电场和空间电荷密度作为位置和时间的函数计算。计算的空间电荷分布显示了正电荷和负电荷从电极注入以及体电荷的解离和复合。在偏振片上记录平行平面、叶片平面和点平面电极测量的光强度，并使用CCD相机记录点平面电极测量的光强度。点-面电极采用CCD摄像机，由于光程短，可以更精确地分辨灰度光强分布。所有的HV克尔电光测量显示出显着的空间电荷效应在碳酸丙烯酯，因为光强度分布显着不同的计算克尔效应模式从数值解拉普拉斯方程下的空间电荷自由的条件下。
The Kerr electro-optic field mapping technique has been used to study space charge effects in HV pulsed propylene carbonate (C/sub 4/H/sub 6/O/sub 3/) using stainless steel parallel-plane, aluminum blade-plane, and aluminum point-plane electrodes. Measurements presented here were taken using a circular polariscope with aligned polarizers at room temperature (T /spl sim/ 20 to 27/spl deg/C). Average peak space charge free electric field strengths were E/sub 0/ /spl sim/ 52 kV/cm for the parallel-plane electrodes, E/sub 0/ /spl sim/ 210 kV/cm at the blade electrode tip and E/sub 0/ /spl sim/ 240 kV/cm at the point electrode tip. The measurement times ranged from 10 /spl mu/s to 1 ms. For the parallel-plane electrodes, the light intensity pictures were analyzed along a line between electrodes in the center of the electrode gap and for the blade-plane and point-plane electrodes the light intensity pictures were analyzed both from the tip of the blade and point, to the plane, and along the plane surface. From the light intensity distribution for the parallel-plane and blade-plane electrodes, the electric field and space charge density were calculated as a function of position and time. The calculated space charge distributions show both positive and negative charge injections from the electrodes as well as bulk charge dissociation and recombination. The light intensity was recorded on Polaroid film for the parallel-plane, blade-plane and point-plane electrode measurements and also with a CCD camera for the point-plane electrodes. A CCD camera was used for the point-plane electrodes to resolve more accurately the gray-scale light intensity distribution because of the short optical path length. All the HV Kerr electro-optic measurements showed significant space charge effects in propylene carbonate because the light intensity distributions differed significantly from the calculated Kerr effect patterns from numerical solutions to Laplace's equation under space-charge free conditions.