High time resolution space charge microscope by using the space charge measurement technique

空间电荷测量技术用于测量固体绝缘材料中电荷的分布和行为。空间电荷在绝缘材料中具有瞬态分布和三维分布。在工业应用中，三维空间电荷测量系统的开发是必不可少的。高速二维或三维系统可用于电力电缆绝缘材料、印刷电路板、聚合物绝缘体的开发、聚合物绝缘体的设计和可靠性评估。采用空间电荷测量技术，对高时间分辨率二维空间电荷显微镜的性能指标为：观察面积：厚度方向Z: 1 ~ 2mm，截面X: 30mm，时间分辨率：毫秒间隔。脉冲电声（PEA）方法被广泛用于测量固体模具厚度中的空间电荷分布。对PEA系统进行了改进，研制的二维空间电荷显微镜具有11个传感器，这些传感器连接在底部的铝电极上，当脉冲电压施加到样品上时，传感器可以同时检测声波信号。每个传感器都是PVDF薄膜，传感器以2-3mm的间隔放置在线路上。在没有同轴电缆开关的数字化示波器中，这些信号被放大并直接记录到每个存储器中。空间电荷测量得到的一个众所周知的现象是“整体电荷”，它从一个电极注入，并作为一个整体传播到另一个电极。使用正常的PEA系统，观察到它是在试样内部移动的散装电荷。研制了一种二维空间电荷显微镜，可测量样品剖面上的空间电荷分布。结果表明，“包电荷”不是均匀的，内部空间电荷行为比体积电荷更为复杂。少

The space charge measurement technique is used for measurement of the distribution and behavior of the charges in the solid insulation material. The space charge could be distributed in the insulating materials in transient state and three dimensionally. The development of three dimensional (3D) space charge measurement systems is required in the industrial applications. The high speed 2 or 3D system will be useful for the applications as follows: insulating material for power cable, printed circuit board, development of polymer insulator, design of polymer insulator and evaluation of reliability. The target of performance of the high time resolution 2D space charge microscope by using the space charge measurement technique, which is as follows: area of observation: thickness direction Z: 1-2 mm, cross section X: 30mm, time resolution: millisecond interval.The pulsed electro acoustic (PEA) method is widely used to measure the space charge distribution through the thickness of solid die … More lectric materials. It is improved the PEA system, the developed 2D space charge microscope has 11 sensors which are attached to the bottom aluminum electrode, and the sensors detect acoustic wave signals at the same time, when a pulse voltage is applied to the sample. Each sensor is a PVDF film and the sensors are placed at 2-3mm intervals in the line. These signals are amplified and directly recorded to each memory in digitizing oscilloscopes without coaxial cable switches. One of the well-known phenomena obtained by space charge measurement is the 'panket charge' that is injected from one electrode and travels as a bulk to the other electrode. It has been observed as a bulk charge that moves inside the specimen, using a normal PEA system. The developed 2D space charge microscope that can measure space charge profiles in a section of the specimen. It was revealed that the 'packet charge' is not homogeneous, and internal space charge behavior is more complicated than those described for bulk charge. Less