Development of a KNN Ceramic-Based Lead-Free Linear Array Ultrasonic Transducer
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 6, 2018
Summary
This study developed a novel lead-free ultrasonic transducer using KNLNTS piezoceramics for high-frequency medical imaging. The new transducer offers excellent imaging capabilities, providing a safer and effective alternative to traditional lead-based devices.
Area of Science:
- Materials Science
- Biomedical Engineering
- Acoustics
Background:
- Traditional ultrasonic transducers utilize lead-based piezoelectric materials, posing environmental and health risks.
- High-frequency array transducers offer superior imaging resolution for detecting smaller features.
Purpose of the Study:
- To develop and characterize a novel 64-element, high-frequency (18.3 MHz) lead-free linear array ultrasonic transducer.
- To evaluate the performance and imaging capabilities of the lead-free transducer as an alternative to lead-based ones.
Main Methods:
- Fabrication of a 64-element linear array transducer using (K0.44Na0.52Li0.04)(Nb0.86Ta0.1Sb0.04)O3 (KNLNTS) piezoceramic.
- Integration with a custom flexible circuit, matching layers, and a light backing material.
- Performance evaluation including center frequency, bandwidth, insertion loss, crosstalk, and imaging tests using a tungsten wire phantom.
Main Results:
- The developed KNLNTS ceramic-based transducer achieved a center frequency of 18.3 MHz with a 42% -6-dB bandwidth.
- Demonstrated low crosstalk (< -53 dB) and acceptable insertion loss (41.8 dB).
- Imaging tests showed good axial and lateral spatial resolution, confirming imaging capability.
Conclusions:
- The lead-free KNLNTS ceramic-based linear array ultrasonic transducer is a viable and promising alternative to conventional lead-based transducers.
- This development contributes to safer and more environmentally friendly ultrasound medical imaging technologies.
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