Transmission line model for acoustic signal propagation in PEA system

Abstract

Pulsed Electro-Acoustic Method is widely used for the measurement of charge in polymeric insulation. The method is based upon the generation of acoustic wave proportional to charge and pulsed electric field. This acoustic wave traverses several material layers before being sensed and converted to electrical signal by a piezoelectric transducer. Due to multiple reflections in its path a direct analysis of travelling acoustic wave would be complex. We have proposed the modeling of acoustic circuit of Pulsed Electro-Acoustic method. The acoustic circuit has been realized using analogy between acoustic wave and wave propagation in electric transmission line. The piezoelectric transducer is also modeled as a transmission line as in modified Leach’s transducer model, except that, in the present case the transducer absorbs acoustic signal instead of generating.