Application Cases

Experiment Name: Experimental Validation of Self-Sensing Displacement in Piezoelectric Ceramic Actuators Based on Integrator Method

Test Equipment: Voltage amplifier, Piezoelectric ceramic actuator, Integrator, Capacitive displacement sensor, Low-pass filter, Computer, etc.

Experimental Process:

Figure 1: Experimental system for self-sensing displacement of piezoelectric ceramic actuators based on integrator method

The experimental system, shown in Figure 1, consists of a computer, A/D and D/A data acquisition cards, voltage amplifier, two-stage vibration isolation platform, piezoelectric ceramic actuator, integrator, discharge circuit, capacitive displacement sensor, differential amplifier, and low-pass filter. The copper sheet, capacitive displacement sensor, differential amplifier, and low-pass filter form an independent measurement system used to compare with the sensing results of the integrator-based self-sensing piezoelectric ceramic actuator.

Experimental Results:

Figure 2: Charge detected by the integrator and displacement measured by the capacitive displacement sensor under different driving voltage waveforms

Figures 2(a) to 2(f) show the charge detected by the integrator and the displacement measured by the capacitive displacement sensor when the driving frequency is 5 Hz and the driving voltages are amplitude-attenuated sine waves, amplitude-attenuated triangular waves, and arbitrary waveforms, respectively.

From the figures, it can be observed that the displacement curves of the actuator obtained independently by the integrator and the capacitive displacement sensor show good consistency. This demonstrates that the integrator-based self-sensing method can effectively detect the displacement signals of the piezoelectric ceramic actuator.

Voltage Amplifier Recommendation: ATA-2161

Figure: ATA-2161 High-Voltage Amplifier Specifications

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