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Article

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

School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
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Author to whom correspondence should be addressed.
Micromachines 2024, 15(6), 775; https://doi.org/10.3390/mi15060775
Submission received: 14 May 2024 / Revised: 7 June 2024 / Accepted: 7 June 2024 / Published: 11 June 2024

Abstract

The electromagnetic eddy current non-destructive testing system enables the non-destructive analysis of surface defect information on tested materials. Based on the principles of eddy current detection, this paper presents a digital eddy current detection method using high-speed sampling based on STM32. A differential eddy current coil is used as the detection probe, and the combination of a differential bridge and a differential amplifier circuit helps to reduce common-mode noise interference. The detection signal is collected via an STM32-based acquisition circuit and transmitted to the host computer through Ethernet for digital demodulation processing. The host computer performs operations such as smoothing averaging, sinusoidal fitting, and outlier removal to extract the amplitude and phase of the detection signal. The system also visually displays the condition of the tested object’s surface in real time through graphical visualization. Testing showed that this system can operate at frequencies up to 8.84 MHz and clearly identify defects as narrow as 1 mm on the surface of the tested steel plate.
Keywords: eddy current detection; high-speed sampling; digital demodulation; sinusoidal fitting; STM32 microcontroller eddy current detection; high-speed sampling; digital demodulation; sinusoidal fitting; STM32 microcontroller

Share and Cite

MDPI and ACS Style

Cao, X.; Li, E.; Yuan, Z.; Zheng, K. Digital Eddy Current Detection Method Based on High-Speed Sampling with STM32. Micromachines 2024, 15, 775. https://doi.org/10.3390/mi15060775

AMA Style

Cao X, Li E, Yuan Z, Zheng K. Digital Eddy Current Detection Method Based on High-Speed Sampling with STM32. Micromachines. 2024; 15(6):775. https://doi.org/10.3390/mi15060775

Chicago/Turabian Style

Cao, Xiong, Erlong Li, Zilan Yuan, and Kaituo Zheng. 2024. "Digital Eddy Current Detection Method Based on High-Speed Sampling with STM32" Micromachines 15, no. 6: 775. https://doi.org/10.3390/mi15060775

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