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Open-circuit test of a PZT vibrator and its applications
1Department of Engineering and System Science, National Tsing-Hua University, 101, Section 2 Kuang Fu Road, Hsinchu 30043, Taiwan, ROC.
Ultrasonics
|December 5, 2002
Summary
Researchers studied the electrical shock in Langevin-type PZT vibrators. An open-circuit test helps quantify transient responses and refine equivalent circuits for better loss estimation.
Area of Science:
- Materials Science
- Electrical Engineering
- Physics
Background:
- Langevin-type piezoelectric ceramic (PZT) vibrators exhibit complex terminal transient responses when switched off.
- Understanding these responses is crucial for quantifying electrical shock and improving device modeling.
- Existing equivalent circuits may not fully capture the real mechanical and dielectric losses.
Purpose of the Study:
- To theoretically and experimentally investigate the terminal transient response of a Langevin-type PZT vibrator.
- To quantify the electrical shock induced immediately after AC voltage is switched off.
- To refine the equivalent circuit model of the PZT vibrator.
Main Methods:
- Developed and proposed an open-circuit test to analyze the transient response.
- Measured AC and DC times, and the maximum amplitude of the transient response.
- The vibrator was placed on a sponge in air to simulate specific conditions.
Main Results:
- The transient response consists of both DC and AC parts, decaying over time.
- DC times were found to exceed AC times.
- Estimated resistances in the equivalent circuit, representing mechanical and dielectric losses, were sensitive to vibration amplitude, unlike inductance and capacitances.
Conclusions:
- The proposed open-circuit test effectively quantifies transient responses and electrical shock.
- The refined equivalent circuit provides a better representation of real losses in PZT vibrators.
- Maximum shock amplitude depends on source frequency and open-circuit time, reaching approximately 65 times the source amplitude.
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