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Self-focusing high-frequency ultrasonic transducers for non-destructive testing applications.

Jianxin Zhao1, Jialin Hao1, Dongdong Chen2

  • 1Northwest Institute of Mechanical and Electrical Engineering, Xianyang, 712099, Shaanxi, China.

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A novel self-focusing ultrasonic transducer uses half-concave piezoelectric elements for high-frequency non-destructive testing (NDT). This innovative design improves resolution and efficiency for industrial defect detection, particularly in chip packaging.

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High-frequencyNon-destructive testingSelf-focusingUltrasonic transducer

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Area of Science:

  • Materials Science
  • Acoustics
  • Non-Destructive Testing

Background:

  • High-frequency acoustic waves are crucial for industrial non-destructive testing (NDT) due to their high resolution and sensitivity.
  • Current focusing methods for high-frequency transducers, such as mechanical pressure and lens focusing, can cause damage and reduce transmission efficiency.

Purpose of the Study:

  • To propose and demonstrate an efficient self-focusing approach for high-frequency ultrasonic transducers.
  • To overcome the limitations of traditional focusing methods in NDT applications.

Main Methods:

  • Utilized half-concave piezoelectric elements to achieve self-focusing at high frequencies.
  • Employed precise micro-nano processing technology for transducer design and fabrication.
  • Characterized the transducer's performance at a high frequency of 62.7 MHz.

Main Results:

  • Successfully designed and fabricated a self-focusing half-concave ultrasonic transducer.
  • Achieved excellent lateral resolution of 39 μm and a -6 dB bandwidth of 76.6%.
  • Demonstrated outstanding imaging performance on a multilayer circuit board and a chip.

Conclusions:

  • The self-focusing half-concave high-frequency ultrasonic transducer shows significant potential for industrial NDT.
  • This technology is particularly promising for high-resolution defect detection in chip packaging.