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In the past, several experimental methods have been developed [1] for the analysis of charge and polarization distributions within dielectrics. The acoustic pressure step method originally proposed by Lauren&#x00E7;eau et al. [2] recently could be improved significantly achieving resolutions in the order of a few &#x03BC;m [3, 4]. Instead of using pressure steps generated by a shock tube [2] or pressure pulses originating from short and intense laser excitation [3] our technique for pressure step generation [4] makes use of the transient response of a piezoelectric crystal plate. In the experimental arrangement, c.f. Fig. 1, a 100nsec duration, 400 volt pulse from a 50&#x03A9;-c&#x03BF;-axial cable discharge generator is applied to the Schematic representation of the experimental technique. (1) Connection to voltage pulse generator (150psec risetime), (2) Connection to wideband preamplifier and oscilloscope.

High resolution technique for measuring charge and polarization distributions in dielectrics by piezoelectrically induced pressure step waves (PPS)