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

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 ST...

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Veröffentlicht in:Micromachines (Basel) Jg. 15; H. 6; S. 775
Hauptverfasser: Cao, Xiong, Li, Erlong, Yuan, Zilan, Zheng, Kaituo
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Switzerland MDPI AG 11.06.2024
MDPI
Schlagworte:
Amplifiers (Electronics)
Analysis
Community support
Corrosion
Cost reduction
Data analysis
Data transmission
Defects
Demodulation
Differential amplifiers
Digital computers
digital demodulation
Digital signal processors
eddy current detection
Eddy current testing
Eddy currents
Electromagnetism
Ethernet
Field programmable gate arrays
High speed
high-speed sampling
Magnetic fields
Methods
Noise control
Nondestructive testing
Sampling
Sensors
Signal processing
sinusoidal fitting
Software
Steel plates
STM32 microcontroller
Surface defects
digital demodulation
sinusoidal fitting
eddy current detection
STM32 microcontroller
high-speed sampling
ISSN:2072-666X, 2072-666X
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Zusammenfassung: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.
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ISSN:2072-666X
2072-666X
DOI:10.3390/mi15060775