Measurement of the electric potential distribution on piezoelectric ceramic surface

Abstract

This paper deals with the measurement of electric potential distribution on the surface of piezoceramics. The electronic measuring device is presented, based on the capacitive coupling in order to obtain the electrical potential value and its pattern on the piezoelectric transformer. Experimental results are discussed and compared to theoretical ones in the context of application as plasma discharge generator.

Spatiotemporally resolved measurements of electric field around a piezoelectric transformer using electric-field induced second harmonic (E-FISH) generation

“…This linear relation is also reflected in the |E x | values measured right at the top surface in figure 4(a), which stay almost constant along the longitudinal position, with any deviations mainly due to experimental noise. The offset of the peak in the surface potential near the front surface has also been observed in other experimental explorations using other techniques [37,42]. We note, however, that analytical modeling [31,37] suggests that a sinusoidal surface potential distribution is expected on the top surface of the PT that is proportional to the vibrational displacement [11].…”

“…As noted earlier, a similar non-monotonic potential distribution on the top surface was measured by Teranishi et al [41] using a set of capacitive strip probes. Martin et al used 1D analytic modeling to ascribe the non-monotonic behavior to the effect of an external load in contact with the PT [42], but notably modeling with loads taken into account still overestimated the surface potential near the front surface (although they did improve the accuracy of model predictions at the majority of positions on the PT surface). This reasoning, however, cannot explain the finding in figure 6(b) which shows a relatively uniform voltage distribution with a high value (5.96 ± 0.16 kV) in the middle of the front of the PT with gradients at the edges, instead of a uniform potential on the front surface.…”

“…Measurements using this approach, along with its modifications, have been compared to analytical models developed by Pigache and collaborators [31,38]. Despite the measured potential values showing satisfactory agreement with the analytical predictions in some areas on the PT's surface [38,42], discrepancies suggest that it would be impactful to have a secondary experimental tool for comparison, validation, and an overall deeper understanding of the underlying physics.…”

Piezoelectric Direct Discharge: Devices and Applications

“…If electric sensors are used [65,66], they should either have very high impedance, like in the measurements with a matrix of capacitive high impedance probes shown in [67], or the sensor should be positioned at a sufficiently large distance. The technique based on a large area capacitive probe placed in a safe (not influencing the PDD) distance from the PCPG is described in [68].…”