Series non-ferroelectric capacitance creates apparent ferroelectric D-E loops, and a simple microphone method reveals true piezoelectric S-E loops in a commercial capacitor.
Output of an EM proportional to the pressure change and S is measured as a charge through a capacitor CM, and a pair of two switches is used to choose D and S signals
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Apparent Ferroelectric Polarization Hysteresis and a Simple Method to Observe Piezoelectric Strain Loops with a Microphone
Series non-ferroelectric capacitance creates apparent ferroelectric D-E loops, and a simple microphone method reveals true piezoelectric S-E loops in a commercial capacitor.