Cross-section space charge measurement system

Non-destructive space charge measurement techniques have been used to investigate space charge behavior in insulating materials. Direct multidimensional space charge measurement systems are also required to observe for the localized space charge distribution in applications of the insulating material. Some multi-dimensional space charge measurement systems have been developed in the pulsed electro-acoustic (PEA) and pressure-wave-propagation (PWP) method. However, it takes time to measure multi-dimensional space charge distribution within the sample in these systems. Since the space charge behaviour is generally in transient, a real time measurement system will be also required in the multi-dimensional system. A two-dimensional space charge measurement system in lateral and thickness direction for transient space charge has been developed using multiple acoustic sensors in the PEA method. In this report, fundamental performances of the developed two-dimensional space charge measurement system are introduced.