基于光学方法的低密度聚乙烯空间电荷测量研究

发布时间：2019-06-14 00:35

【摘要】：近几十年来，聚合物绝缘电介质在电力领域得到越来越广泛的应用。电气行业的快速发展对这类固体电介质的电性能要求越来越高。电介质材料的空间电荷行为直接影响其电性能。目前，传统的空间电荷无损检测方法和技术已经发展的较为成熟，并且较为广泛地用于绝缘材料研究等方面。由于测量系统的带宽限制，这些检测手段的空间分辨率只能达到微米尺度。因此，为了研究更小尺度内的空间电荷行为，提出一种新的空间电荷测量方法就显得尤为重要。本文提出了一种全光学方法测量低密度聚乙烯(LDPE)空间电荷的方案，即利用脉冲光电场与注入电荷的LDPE发生作用，利用应力双折射效应检测弹性波。对光电场与物质作用以及应力双折射效应的原理做了简要分析，提出了一种LDPE表面旋涂电光聚合物的试样结构。阐述了方案提出的测量系统的具体工作过程，并对方案可能存在的问题进行了分析。实现光学方法测量LDPE空间电荷的前提是脉冲光电场能够与介质内部的空间电荷发生作用。为了验证这一假设，本文搭建了验证试验平台系统，利用脉冲激光作为激发光，，使用脉冲电声(PEA)法空间电荷测试系统的检测部分进行测量。分析了脉冲光的偏振状态和在试样表面的入射角度，并对光电场进行了计算。验证试验的结果与PEA系统测量LDPE空间电荷分布的结果进行比较，表明脉冲光电场可以与注入电荷的LDPE作用产生弹性波。本文利用搭建的验证试验系统，通过改变激发光的波长和入射在LDPE表面的角度，得到不同脉冲光电场下的系统输出电压。分析了光波长和入射角对系统输出电压的影响，并对反映试样内部空间电荷的信号进行了提取。
[Abstract]:In recent decades, polymer insulated dielectric has been more and more widely used in the field of power. With the rapid development of electrical industry, the electrical performance of this kind of solid dielectric is required to be higher and higher. The space charge behavior of dielectric materials directly affects their electrical properties. At present, the traditional space charge nondestructive testing methods and technologies have been developed more mature, and more widely used in insulation materials research and so on. Due to the bandwidth limitation of the measurement system, the spatial resolution of these detection methods can only reach the micron scale. Therefore, in order to study the space charge behavior in a smaller scale, it is particularly important to propose a new space charge measurement method. In this paper, an all-optical method for measuring the space charge of low density polyethylene (LDPE) is proposed, in which the pulse photoelectric field interacts with the injected charge LDPE and the stress birefringence effect is used to detect the elastic wave. The interaction between photoelectric field and material and the principle of stress birefringence effect are briefly analyzed, and a sample structure of rotating coated electro-optic polymer on LDPE surface is proposed. This paper expounds the concrete working process of the measurement system proposed by the scheme, and analyzes the possible problems existing in the scheme. The premise of measuring LDPE space charge by optical method is that the pulse photoelectric field can interact with the space charge in the medium. In order to verify this hypothesis, a verification test platform system is built in this paper. Pulse laser is used as excited light, and pulse electroacoustic (PEA) method is used to measure the space charge measurement system. The polarization state of pulse light and the incident angle on the surface of the sample are analyzed, and the photoelectric field is calculated. The experimental results are compared with the results of LDPE space charge distribution measured by PEA system. It is shown that the pulse photoelectric field can interact with the injected charge LDPE to produce elastic waves. In this paper, the output voltage of the system under different pulse photoelectric fields is obtained by changing the wavelength of excited light and the angle of incident on the surface of LDPE by using the verification test system. The effects of optical wavelength and incident angle on the output voltage of the system are analyzed, and the signals reflecting the space charge in the sample are extracted.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM215

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