The Polarization Charge Observation in Dielectric Material Using PEA Method

The pulsed electroacoustic (PEA) method could not evaluate the polarization charge and the true charge separately due to the positional resolution of the measurement system. In this study, we attempt to distinguish them by applying the voltage through the vacuum gap. We used various polymer insulating materials with different relative permittivity as a sample to clarify the relationship between relative permittivity and the amount of the polarization charge. The results show that the charge signal reflecting the polarization charge was observed at sample-vacuum interface, and the output signal intensity increased with the increase of the applied electric field and relative permittivity.