Miniature piezoelectric conical transducer: fabrication, evaluation and application

Area of Science:

• Materials Science
• Acoustics
• Mechanical Engineering

Background:

• Conventional conical transducers for acoustic emission (AE) measurements are often bulky and difficult to handle.
• Piezoelectric ceramic (PZT) elements are crucial components in AE transducers, influencing their sensitivity and frequency response.

Purpose of the Study:

• To develop a novel, compact miniature-conical transducer for AE measurements.
• To improve the ease of use and portability of AE transducers while maintaining quantitative measurement capabilities.

Main Methods:

• Fabrication of miniature PZT conical elements using excimer laser micromachining, achieving contact sizes below 300 micrometers.
• Construction of miniature-conical transducers incorporating the laser-machined PZT elements.
• Performance evaluation through standard quantitative acoustic emission testing on a plate specimen.

Main Results:

• Successful fabrication of miniature-conical transducers with significantly reduced size compared to conventional designs.
• Demonstration of good quantitative measurement results during acoustic emission testing.
• Validation of the effectiveness of laser micromachining for producing small PZT elements.

Conclusions:

• The developed miniature-conical transducer offers a compact and user-friendly alternative for AE measurements.
• The laser micromachining technique is effective for creating high-performance miniature PZT elements.
• These transducers show significant potential for various applications requiring precise transient elastic wave analysis.