Preliminary Kerr electro-optic field measurements in melted polyethylene

Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics Pub Date : 1989-07-03 DOI:10.1109/ICSD.1989.69258

J. Brennan, M. Zahn

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引用次数: 2

Abstract

Utilizing a frequency-selective amplifier, sensitive Kerr electrooptic field mapping measurements were made in melted (>110 degrees C) low-density polyethylene (LDPE) with a small signal AC voltage superimposed on a DC voltage. Preliminary measurements show significant levels of field distortion due to bipolar homocharge injection with charge density magnitudes on the order of 0.01 C/m/sup 3/ for field strengths on the order of 6 kV/cm. The experiment utilizes short parallel-plate electrodes of length 15 cm so that E/sub m/, the electric field necessary for the first light maxima with crossed polarizers, is approximately 500 kV/cm. By normalizing the optically measured average field to the voltage divided by spacing, the Kerr constant of melted LDPE at approximately=140 degrees C was found to be B approximately=1.3*10/sup -15/ m/V/sup 2/. The high sensitivity of the experiment also makes it possible to measure the self-field, and its subsequent decay, due to the charge density alone after the electrodes have been short-circuited.<>

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熔融聚乙烯中克尔电光场的初步测量

利用频率选择放大器，在熔融(>110℃)低密度聚乙烯(LDPE)中进行敏感的Kerr电光场测绘测量，并将小信号交流电压叠加在直流电压上。初步测量结果表明，在电场强度为6 kV/cm的情况下，电荷密度约为0.01 C/m/sup 3/时，双极同电荷注入会产生显著的场畸变。该实验利用长度为15厘米的短平行极板电极，使E/sub /，即交叉偏振器产生第一个最大光所需的电场，约为500千伏/厘米。通过将光学测量的平均场归一化为电压除以间距，得到熔体LDPE在约=140℃时的克尔常数为B，约=1.3*10/sup -15/ m/V/sup 2/。实验的高灵敏度也使得测量自场和随后的衰减成为可能，这是由于电极被短路后仅电荷密度造成的

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Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics

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