  The deconvolution algorithm for measuring distribution of space charge under
dc by the pressure wave propagation (PWP) method is studied in this paper. A
new Fredholm integral equation of first kind, including a space charge
distribution without a partial differential operator is presented. Numerical
methods based on Tikhonov regularization for solving this integral equation and
the original PWP equation are studied. Numerical simulation is studied for the
effect of signal-to-noise ratio (SNR), and comparison with other algorithms is
discussed. The numerical solution of an electric field distribution from
measurements of a LDPE specimen is obtained successfully.
