Modeling and Simulation of Pulsed Electroacoustic Measurement Method

Abstract

Pulsed electroacoustic (PEA) method is a very popular method for measurement of charge in dielectrics. In this method, an acoustic wave proportional to charge is generated by a pulsed HV. The 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 traveling acoustic wave would be complex. In this paper, we have proposed simulation of the physical model of the PEA method consisting of electrical and acoustic circuits. Using PSpice model of the method, authors have tried to address some design-related issues, which appear to have not been reported in earlier works. 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. Approximate theoretical equations have been used to compare with simulations, wherever a comparison is possible, and found to match well in those cases.Index Terms-Charge measurement, PSpice model, pulsed electroacoustic (PEA) method.

The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables

“…The acoustic waves that travel in backward directions after being reflected are also sensed by the piezoelectric sensor. Therefore, compared to the work [14], in our model all the acoustic waves are taken into account. In Figure 4, the complete acoustic wave behavior is reported.…”

“…By observing equations (14) and (15), it is possible to notice that the FDTD technique allows to obtain a new information at time n + 1/2 as a function of other information detected in the previous times n and n − 1/2 [23].…”

“…As it can be seen in equations (14) and (15), the voltage terms are those at time and its previous value − 1/2, respectively. Therefore, from equation (14) it is difficult to solve equation (15) and vice versa. This happens because the first one needs entire index, while the second equation needs half quantity of the index.…”

“…Another PEA cell simulation model has been developed with commercial software COMSOL® [14]. In this work, the effect of the piezoelectric sensor thickness in the PEA cell output signal was evaluated, without considering the attenuation and dispersion of acoustic waves.…”

Dependence of space charge dynamics in LDPE on history of voltage application

“…For understanding packet charge phenomenon in LDPE, some researchers proposed numerical models to aid experimental data [14,15,[18][19][20][21]. Some researchers reported the negative differential mobility (NDM), exhibited by charge packets in polyethylene, due to electric field and weaker trapping characteristics [22].…”