同轴结构中压力波法测量空间电荷分布的物理模型研究
发布时间：2018-10-14 19:38
【摘要】：从压力波法测量平板样本中空间电荷分布的理论分析出发,提出了对于同轴结构的固体电介质中空间电荷分布的压力波法测量的物理模型,并得出了测量电流的解析的数学表达式.依据泊松方程,考虑样品内的电场强度、介电常数和空间电荷密度随外界声波扰动而发生变化,将圆柱试样受到的压力波的影响分解成样品形变和质点位移两部分,进而得到了以同轴结构中空间电荷分布的压力波法测量的电压与电流表达式.测量电流的数学表达式表明,对于同轴结构,压力波法的测量电流信号不像平板结构中那样基本正比于空间电荷分布,而是应该做进一步的修正处理.
[Abstract]:Based on the theoretical analysis of space charge distribution in flat plate samples measured by pressure wave method, a physical model of pressure wave measurement for space charge distribution in coaxial solid dielectric is proposed. The analytical mathematical expression of the measuring current is obtained. According to Poisson's equation, considering the change of electric field intensity, dielectric constant and space charge density with external acoustic disturbance, the influence of pressure wave on cylindrical specimen is decomposed into two parts: sample deformation and particle displacement. The expressions of voltage and current measured by pressure wave method with space charge distribution in coaxial structure are obtained. The mathematical expression of the measuring current shows that for the coaxial structure, the current signal measured by the pressure wave method is not basically proportional to the space charge distribution as in the flat plate structure, but should be further modified.
【作者单位】： 同济大学电气工程系;同济大学上海市特殊人工微结构材料与技术重点实验室;ESPCI-Paris
【基金】：国家自然科学基金(批准号:51477118)资助的课题~~
【分类号】：O487
本文编号：2271445
[Abstract]:Based on the theoretical analysis of space charge distribution in flat plate samples measured by pressure wave method, a physical model of pressure wave measurement for space charge distribution in coaxial solid dielectric is proposed. The analytical mathematical expression of the measuring current is obtained. According to Poisson's equation, considering the change of electric field intensity, dielectric constant and space charge density with external acoustic disturbance, the influence of pressure wave on cylindrical specimen is decomposed into two parts: sample deformation and particle displacement. The expressions of voltage and current measured by pressure wave method with space charge distribution in coaxial structure are obtained. The mathematical expression of the measuring current shows that for the coaxial structure, the current signal measured by the pressure wave method is not basically proportional to the space charge distribution as in the flat plate structure, but should be further modified.
【作者单位】： 同济大学电气工程系;同济大学上海市特殊人工微结构材料与技术重点实验室;ESPCI-Paris
【基金】：国家自然科学基金(批准号:51477118)资助的课题~~
【分类号】：O487
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