High Frequency PMN-PT 1-3 Composite Transducer for Ultrasonic Imaging Application

Area of Science:

• Materials Science
• Acoustics
• Biomedical Engineering

Background:

• Conventional piezoelectric materials face limitations in high-frequency ultrasonic transducer applications.
• There is a need for advanced composite materials with enhanced electromechanical properties.

Purpose of the Study:

• To develop and characterize PMN-PT single crystal/epoxy 1-3 composites for high-frequency ultrasonic transducers.
• To evaluate the performance of these composites in a fabricated ultrasound transducer.

Main Methods:

• Fabrication of PMN-PT/epoxy 1-3 composites using Deep Reactive Ion Etching (DRIE) with a 45% PMN-PT volume fraction.
• Development of a 35 MHz ultrasound flat transducer utilizing the fabricated composite.
• Performance evaluation including effective electromechanical coupling coefficient, insertion loss, bandwidth, and axial resolution.

Main Results:

• The composite exhibited a high effective electromechanical coupling coefficient of 0.81.
• An insertion loss of 18 dB and a -6 dB bandwidth of 100% were achieved.
• The fabricated transducer demonstrated an axial resolution of 30 micrometers, aligning with theoretical predictions.

Conclusions:

• PMN-PT single crystal/epoxy 1-3 composites possess attractive properties for high-frequency ultrasonic transducers.
• These composites show significant advantages over conventional piezoelectric materials for medical imaging.
• The developed material and transducer design hold potential for advancing ultrasound technology.