A5081122301- Non-Destructive Testing Techniques
- Welding Techniques and Residual Stresses
- Magnetic properties of thin films
- Ultrasonics and Acoustic Wave Propagation
- Microfluidic and Bio-sensing Technologies
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Field Sensors Techniques
- Magnetic Properties and Applications
- Geophysical Methods and Applications
- Magneto-Optical Properties and Applications
National Kaohsiung University of Science and Technology
2020-2021
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...
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...