Application Cases

Experiment Name: Application of High-Voltage Amplifier in High-Power Testing System for Piezoelectric Ceramics

Experiment Objective: To obtain the mechanical quality factor under high-power conditions at high vibration velocities, objectively reflecting the performance of piezoelectric components in practical applications.

Experimental Equipment: Signal generator, voltage/current probes, computer, ATA-4052 high-voltage power amplifier, digital oscilloscope, laser vibrometer, fixture, piezoelectric ceramic samples, etc.

Experimental Procedure:
The testing system primarily consists of a signal generator, high-voltage amplifier, digital oscilloscope, voltage/current probes, laser Doppler vibrometer, computer control system, and associated software. During testing, the computer control software sends a command, triggering the signal generator to produce an initial sinusoidal signal. This signal is amplified by the high-voltage amplifier and applied to the sample under test, inducing vibration in the sample. As the sample vibrates, the laser Doppler vibrometer monitors its vibration velocity, while the probes collect the voltage across the sample or the current passing through it. The measured results from both are captured by the oscilloscope and fed back to the computer terminal for final processing using custom-developed software. A flowchart of the testing system is shown below.

Figure: Schematic Diagram of the Experimental System

Experimental Results:
The variation of mechanical quality factor with mechanical energy density and the variation of mechanical quality factor with vibration velocity.

Figure: Variation of Mechanical Quality Factor with Mechanical Energy Density for PZT-Based Piezoelectric Ceramics in p-mode and 31-mode

Figure: Curve of Mechanical Quality Factor Variation with Vibration Velocity

Experimental Conclusion:
The high-power characteristics of piezoelectric ceramics were studied, specifically the variation curve of the mechanical quality factor with vibration velocity. The results indicate that the Qm value decreases as vibration velocity increases; the trend of the curve varies with different vibration modes or states. In the low vibration velocity region (<0.2 m/s), hard PZT piezoelectric ceramics exhibit high stability in Qm values and maintain relatively high Qm values even in the high vibration velocity region. Lead-free piezoelectric ceramics demonstrate good stability in the high vibration velocity region. The research findings on high-power characteristics provide effective theoretical support and guidance for the selection of piezoelectric ceramics and the design of devices (such as the source level of underwater acoustic transducers).

Figure: ATA-4052C High-Voltage Power Amplifier Specifications and Parameters