Application Cases

Experiment Title: Electric Field Polarization and Hysteresis Loop Experiment of Piezoelectric Ceramics

Testing Purpose:

A detailed explanation is provided on the construction of an experimental platform for the hysteresis phenomenon in the electric field-polarization of piezoelectric ceramics, covering the setup of the experimental apparatus, the experimental principle, and the experimental process. After obtaining the experimental data, filtering was applied to the data to obtain accurate input and output data for the subsequent establishment of a wideband dynamic hysteresis model.

Testing Equipment:

High Voltage Amplifier, Arbitrary Function Generator, Digital Oscilloscope, PZT Piezoelectric Ceramic, etc.

Experiment Process:

The non-linear hysteresis data of polarization and electric field (P-E) of piezoelectric ceramics are indirectly obtained through the experimental setup, which consists of a disc-shaped piezoelectric ceramic, an arbitrary function generator, a digital oscilloscope, and a high voltage amplifier. After connecting the experimental equipment, the output signal of the function generator is set to a sine wave with an amplitude of 9Vpp. The signal generated by the arbitrary function generator is input into the high voltage amplifier, which amplifies it 1000 times and then applies it to the two opposite surfaces of the piezoelectric ceramic. Under the influence of the external electric field, the internal electric domain structure of the piezoelectric ceramic changes, and new ferroelectric domain nuclei are generated. Eventually, the internal domain polarization direction aligns with the direction of the external electric field strength, resulting in equal amounts of opposite charges on the two surfaces. When the connecting wires form a closed loop, the like charges will move in a directed manner, generating an output current. By adjusting the frequency of the input signal generated by the arbitrary function generator, multiple sets of experimental data on input voltage and output current at different frequencies can be obtained.

Experimental Results:

Figure 1: Comparison of Experimental Data Before and After Filtering

Taking 0.2Hz, 1Hz, 20Hz, and 150Hz as examples, the data before and after filtering are compared as shown in Figure 1. After obtaining multiple sets of experimental data on input voltage and output current under different frequency input signals, filtering is first performed, followed by integration to obtain the change in charge, thereby deriving the polarization intensity. Finally, hysteresis loop images at different frequencies can be plotted.

High Voltage Amplifier Recommendation: ATA-7050

Figure: Specifications of the ATA-7050 High Voltage Amplifier

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