A5052743089- Non-Destructive Testing Techniques
- Welding Techniques and Residual Stresses
- Ultrasonics and Acoustic Wave Propagation
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magnetic Field Sensors Techniques
- Microfluidic and Bio-sensing Technologies
- Islanding Detection in Power Systems
- Surface and Thin Film Phenomena
- Vehicle License Plate Recognition
- Geophysical Methods and Applications
- Cultural Heritage Materials Analysis
- Currency Recognition and Detection
- Digital Media Forensic Detection
- Characterization and Applications of Magnetic Nanoparticles
- Power Systems Fault Detection
- Magneto-Optical Properties and Applications
- Hydrogen embrittlement and corrosion behaviors in metals
Da Nang University of Technology
2023-2025
University of Da Nang
2023-2025
National Kaohsiung University of Science and Technology
2020-2022
The high sensitivity for low-frequency fields makes the tiny giant magnetoresistance (GMR) sensors suitable high-resolution eddy-current (EC) imaging. In this work, we proposed a novel design of miniature differential EC probe with spin-valve GMR sensor surface and subsurface consists full-bridge chip mounted vertically on edge printed circuit board to reduce liftoff distance. excitation signal is perpendicular sensing axis chip, which it sensitive unbalance conductive sample. operated at...
In this work, we propose a real-time noncontact thickness measurement system for conductive materials based on an inductor-capacitor (LC) resonant eddy-current sensor. For the aluminum, copper, stainless steel 304, and carbon samples of various thicknesses, in-phase quadrature components sensor output taken during liftoff scans are found to be series quadratic-like curves phase versus logarithmic amplitude diagram. These can used generate standard phase-amplitude relations conversion. The...
This work presents a flaw detection system consisting of an array eddy-current (EC) probes based on giant-magnetoresistance (GMR) sensors for mapping the defects metal sheet. Before measurement, spatially dependent calibration process was done to compensate inter-channel inconsistency in output offsets and responsivity. The calibrated 8-channel probe exhibits high sensitivity revealing tiny features with superior spatial resolution. proposed allows visualization geometric characteristics...
The alternating uniform magnetic field is useful for the biomagnetic study with nanoparticles. However, coil system driven by generator a conventional low-voltage power source, it challenging to achieve desired strength large due impedance at higher frequencies. This article proposed Helmholtz that can generate dc and ac up 1.3 kHz low distortion. In order overcome inductive load, computer-controlled parallel capacitor array was designed built tune series coil-capacitor circuit resonant...
The accuracy in the measurement of magnetization curve (<inline-formula> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula>–<inline-formula> notation="LaTeX">$H$ </tex-math></inline-formula>) for soft magnetic materials is easily influenced by external static field unshielded environment. To eliminate influence from environmental field, system must be placed a zero-gauss chamber. However, such device not widely available and also costly. In this work, rapid <inline-formula>...
Abstract Objective: The quality and work-life of ball bearings depend on the material properties steel ball, hence it is necessary to carefully classify their for related applications. This paper presents classification balls based subtle differences in electromagnetic properties. Approach: conductivity magnetic susceptibility same kind are measured investigate correlation with eddy-current (EC) signals. Main results: developed EC sensor works at resonant frequency 117 kHz an optimal readout...
The eddy-current (EC) testing method is frequently utilized in the nondestructive inspection of conductive materials. To detect minor and complex-shaped defects on surface underlying layers a metallic sample, miniature probe with high sensitivity preferred for enhancing signal quality spatial resolution obtained images. In this work, we propose novel design using giant magnetoresistance (GMR) sensor fabricated silicon chip. in-house-made GMR comprises two cascaded spin-valve elements...
This study proposes a novel approach for contactless conductivity measurement of nonmagnetic metal sheets production line. The system uses self-resonant eddy-current sensor as the probe, which sensitivity is enhanced by minimizing parasitic resistance in resonant circuit. output responses at various liftoff distances are nonlinear curves unique to sample’s conductivity. quaternary polynomial regression utilized establish analytic approximation function depict correlation between phase and...
In this work, a method for identifying counterfeit coins based on an electromagnetic acoustic transducer (EMAT) to detect the difference in coin's natural frequency response is presented. experimental system, oscillation induced by pulsed magnetic field received microphone and recorded oscilloscope. The of coin resolved fast Fourier transform (FFT) computer. It found that frequencies possible deviate significantly from standard ranges 16.9 17.4 kHz authentic 50 New Taiwan Dollar (NTD) coins....