Abstract:
Space charge accumulation in dielectrics is an
important phenomenon that needs to be fully understood for
effective utilization of dielectric materials. Pulsed electroacoustic method is one of the well-known techniques used to
measure these space charges. However due to limited frequency
bandwidth of sensor attached at ground electrode, the method
requires signal processing technique like deconvolution to get
actual charge profile inside dielectric material. If there is no
noise in experimental charge signal deconvolution turns out to
be simple and requires only spectral division. However in
practical cases noise is present in experimental charge signal
and deconvolution turns out to be complex and various factors
like resolution and noise are affected in restored charge profile
during deconvolution process. This paper addresses such
critical issues encountered during estimation of space charge
signal. Experimental signal obtained in the authors’ laboratory
has been used for original charge estimation using a PEA
system, which is developed in the authors’ lab.
