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Related Experiment Video

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Coded Excitation for Ultrasonic Testing: A Review.

Chenxin Weng1, Xu Gu1, Haoran Jin1

  • 1The State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China.

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|April 13, 2024
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Summary

Coded excitation (CE) enhances ultrasonic testing by improving signal-to-noise ratio and efficiency. This method overcomes limitations of conventional short pulses, offering better imaging and faster refresh rates in various applications.

Keywords:
coded excitationefficient detectionnon-destructive evaluationsignal-to-noise ratioultrasonic testing

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Area of Science:

  • Ultrasonic Testing
  • Materials Science
  • Medical Imaging
  • Industrial Nondestructive Evaluation

Background:

  • Ultrasonic testing is vital in medicine and industry, requiring high signal-to-noise ratio (SNR) and efficiency for clear imaging and fast refresh rates.
  • Conventional short pulse excitation in ultrasonic testing presents a trade-off between SNR and efficiency, limiting performance.
  • Coded excitation (CE) offers a solution by increasing pulse duration, potentially improving SNR without sacrificing efficiency.

Purpose of the Study:

  • To review the fundamentals and applications of coded excitation (CE) in ultrasonic testing.
  • To highlight CE's potential to overcome the SNR-efficiency trade-off in conventional methods.
  • To explore CE's utility across diverse ultrasonic testing scenarios.

Main Methods:

  • Review of CE fundamentals: signal modulation, transmission, reception, and pulse compression.
  • Discussion of CE optimization techniques.
  • Examination of CE applications in industrial and medical ultrasonic testing.

Main Results:

  • CE allows for increased pulse duration, enhancing SNR and maintaining high efficiency.
  • CE demonstrates significant potential in industrial bulk wave detection (single-probe and phased array) and guided wave detection.
  • CE is also applicable to medical phased array imaging, improving performance.

Conclusions:

  • Coded excitation offers a viable strategy to enhance both signal-to-noise ratio and efficiency in ultrasonic testing.
  • CE provides a pathway to improved imaging clarity, detection depth, and image refresh rates.
  • Future research directions for CE in ultrasonic testing are identified.