【摘要】：溫度變化時(shí)聚合物材料內(nèi)部的電荷輸運(yùn)特性或電極/介質(zhì)界面處電荷注入的特性可能發(fā)生改變。因此,研究聚合物絕緣材料在高溫下的空間電荷特性十分必要。該文采用新型的、具有高居里點(diǎn)的聚偏氟乙烯 三氟乙烯(polyvinylidene fluoride-trifluoroethylene,P(VDF-TrFE))薄膜作為壓電傳感器,分體設(shè)計(jì)了脈沖耦合電路、信號(hào)放大器電路和電極加熱單元,建立了適用于室溫~110℃的電聲脈沖法(pulsed electro-acoustic method,PEA)空間電荷測(cè)量系統(tǒng)。從電聲脈沖法測(cè)量空間電荷的原理出發(fā),分析了對(duì)壓電傳感器輸出的電壓信號(hào)、最終空間電荷密度值的影響因素。計(jì)入了溫度對(duì)試樣中的聲速和試樣相對(duì)介電常數(shù)的影響,得出了溫度影響空間電荷密度的幅值和位置的校正方法。利用該系統(tǒng)測(cè)量了純環(huán)氧試樣在不同溫度下的空間電荷分布特性。
[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，

本文編號(hào)：2273506