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Digital Eddy Current Detection Method Based on High-Speed Sampling with STM32.

Xiong Cao1, Erlong Li1, Zilan Yuan1

  • 1School of Mechanical Engineering, Sichuan University, Chengdu 610065, China.

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|June 27, 2024
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Summary
This summary is machine-generated.

This study introduces a digital eddy current non-destructive testing system for surface defect analysis. The high-speed STM32-based system accurately detects small defects on steel plates using advanced signal processing.

Keywords:
STM32 microcontrollerdigital demodulationeddy current detectionhigh-speed samplingsinusoidal fitting

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Non-Destructive Testing

Background:

  • Electromagnetic eddy current testing is crucial for non-destructive analysis of material surfaces.
  • Existing methods face challenges with noise interference and precise defect identification.

Purpose of the Study:

  • To develop a digital eddy current non-destructive testing (NDT) system utilizing high-speed sampling.
  • To enhance the accuracy and real-time visualization of surface defect detection.

Main Methods:

  • A differential eddy current coil probe was employed with a differential bridge and amplifier to minimize noise.
  • An STM32 microcontroller handled high-speed signal acquisition.
  • Ethernet transmission enabled digital demodulation and processing (averaging, fitting, outlier removal) on a host computer.

Main Results:

  • The system achieved operational frequencies up to 8.84 MHz.
  • It successfully identified surface defects as small as 1 mm on a steel plate.
  • Real-time graphical visualization of surface conditions was implemented.

Conclusions:

  • The developed digital eddy current NDT system offers high-speed, accurate surface defect detection.
  • The integration of STM32 and advanced signal processing effectively overcomes noise and enhances defect resolution.
  • This system provides a viable solution for real-time NDT of metallic surfaces.