Ways to sense electric field using PZT capacitors are investigated. Duality rules a priori apply to material physics, linking polarization to magnetization properties, i.e. D(E)-B(H) curves, but no real electrical flux gate or charge gate does exist which would be the dual of common flux gate magnetometer. The Landau-Khalatnikov equations are applied to ferroelectric materials subjected to both a DC and AC pumping signal. They are solved to get model of the PZT capacitors dynamics. They are experimentally investigated using the Sawyer Tower method. A second harmonic detection is a way to extract the DC excitation.
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