A Comparative Study of De-convolution Methods For Charge Signal Estimation in PEA System

Pulsed electroacoustic method is popular for measuring space charge in dielectrics. However, in the pulsed electroacoustic method, the space charge signal is obtained as an acoustic wave, which is convoluted by transducer amplifier response. To obtain an actual space charge profile, de-convolution is required. In literature most commonly used de-convolution methods are Inverse filter, Wiener de-convolution, Blind de-convolution and Sparse de-convolution. Moreover, selection of appropriate deconvolution method is dependent upon signal characteristic and its application. From literature it seems that mostly Wiener de-convolution is a preferred in space charge signal estimation. So, in this paper, the author investigates and presents a comparative study of all above-mentioned de-convolution methods for space charge signal estimation. For this study, signal obtained using a poly methyl methacrylate sample at electrode-sample interface is conventionally taken.