Measurements of interfacial charges in layered PTFE using step electroacoustic technique

The step-electroacoustic (SEA) technique was applied to measure interfacial charges in layered PTFE. Acoustic signals were measured from both sides of the sample and time-domain analysis was applied to eliminate the effect of reflections of acoustic waves at inner interfaces. The calibrated curves of space charge, electric field and potential in three layered specimen have been shown.