一种适用于高温条件下的电声脉冲法空间电荷测量系统
发布时间：2018-10-15 18:53
【摘要】：温度变化时聚合物材料内部的电荷输运特性或电极/介质界面处电荷注入的特性可能发生改变。因此,研究聚合物绝缘材料在高温下的空间电荷特性十分必要。该文采用新型的、具有高居里点的聚偏氟乙烯 三氟乙烯(polyvinylidene fluoride-trifluoroethylene,P(VDF-TrFE))薄膜作为压电传感器,分体设计了脉冲耦合电路、信号放大器电路和电极加热单元,建立了适用于室温~110℃的电声脉冲法(pulsed electro-acoustic method,PEA)空间电荷测量系统。从电声脉冲法测量空间电荷的原理出发,分析了对压电传感器输出的电压信号、最终空间电荷密度值的影响因素。计入了温度对试样中的声速和试样相对介电常数的影响,得出了温度影响空间电荷密度的幅值和位置的校正方法。利用该系统测量了纯环氧试样在不同温度下的空间电荷分布特性。
[Abstract]:The characteristics of charge transport in polymer materials or charge injection at the electrode / dielectric interface may change with the change of temperature. Therefore, it is necessary to study the space charge characteristics of polymer insulating materials at high temperature. In this paper, a novel polyvinylidene fluoride-trifluoroethylene,P (VDF-TrFE) film with high Curie point is used as piezoelectric sensor. Pulse coupling circuit, signal amplifier circuit and electrode heating unit are designed separately. An electroacoustic pulse method (pulsed electro-acoustic method,PEA) space charge measurement system suitable for room temperature ~ 110 鈩，
本文编号：2273506
[Abstract]:The characteristics of charge transport in polymer materials or charge injection at the electrode / dielectric interface may change with the change of temperature. Therefore, it is necessary to study the space charge characteristics of polymer insulating materials at high temperature. In this paper, a novel polyvinylidene fluoride-trifluoroethylene,P (VDF-TrFE) film with high Curie point is used as piezoelectric sensor. Pulse coupling circuit, signal amplifier circuit and electrode heating unit are designed separately. An electroacoustic pulse method (pulsed electro-acoustic method,PEA) space charge measurement system suitable for room temperature ~ 110 鈩，
本文编号：2273506
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