The Acoustic Wave Behavior Within the PEA Cell for Space Charge Measurement

Abstract

In order to evaluate the acoustic wave behavior within the Pulsed Electro Acoustic (PEA) cell, a simulation model has been developed in this work. The model, implemented in Matlab environment, is based on the analogy between acoustic and electrical quantities. Therefore, it was possible to model the PEA cell as cascade connected lossy transmission lines. The model has been validated theoretically by making a comparison with a simulation result found in literature. The experimental validation has also been made by using the PEA cell of the LEPRE high voltage lab. In addition, four graphs have been realized. Two of them can be used to establish in easy and fast way to obtain the minimum ground electrode and absorber thicknesses that should be used for a specific sample, in order to avoid reflections in the main PEA output signal. For the same aim, two more graphs are provided to select correctly the sample thickness that can be tested in a given PEA cell.