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Optimization Design of Ultrasonic Transducer With Multimatching Layer.

Zhaoxi Li, Dongdong Chen, Chunlong Fei

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |February 16, 2021
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    Summary

    This study optimized ultrasonic transducers (UTs) using a multimatching layer design. The optimized UTs demonstrated significantly improved performance, achieving high accuracy in thickness measurements.

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    Area of Science:

    • Materials Science
    • Acoustics Engineering
    • Optimization Algorithms

    Background:

    • Ultrasonic transducers (UTs) are crucial for various applications, but their performance is often limited by impedance mismatch.
    • Improving UT performance requires sophisticated design strategies, particularly for the matching layers.
    • Existing methods, like quarter wavelength theory, may not yield optimal results for complex designs.

    Purpose of the Study:

    • To develop an optimization design strategy for ultrasonic transducers (UTs) with multimatching layers to enhance their performance.
    • To establish multiobjective optimality criteria for UTs based on key performance parameters.
    • To validate the effectiveness of the optimized design through simulation and fabrication.

    Main Methods:

    • Utilized a piezoelectric equivalent circuit model and PiezoCAD software for simulation.
    • Employed neural network (NN) models to correlate matching layer thickness with UT performance.
    • Applied particle swarm optimization (PSO) algorithm to optimize matching layer thickness based on defined criteria.
    • Fabricated and tested the optimized UT to evaluate its real-world performance.

    Main Results:

    • The optimized multimatching layer design (copper and parylene) achieved target performance metrics.
    • Simulated and fabricated UTs showed center frequency (CF) of 5.672 MHz, -6 dB bandwidth (BW) of 50.08%, and improved pulsewidth (PW).
    • The optimized UT significantly outperformed non-optimized and conventionally designed UTs, with thickness measurement errors below 1.0%.

    Conclusions:

    • The developed optimization strategy effectively enhances UT performance through multimatching layers.
    • The optimized UT exhibits superior bandwidth, center frequency, and pulsewidth compared to conventional designs.
    • The optimized UT is suitable for precise applications, such as non-destructive testing and material characterization.