Some consideration for obtaining the low frequency response of dielectrics from absorption current measurements

In this paper, the relationship between the frequency and time domain windows is discussed and an approach is introduced which allows the response to an infinite excitation (charging) process to be derived from the measurement of the response to a fixed period of excitation. As an example, the measurement of absorption currents and their transformation to the frequency domain are discussed using a polyethersulphone (PES) thin film sample.