A5053848522- Digital Media Forensic Detection
- Welding Techniques and Residual Stresses
- Non-Destructive Testing Techniques
- Cultural Heritage Materials Analysis
- Ultrasonics and Acoustic Wave Propagation
- Currency Recognition and Detection
National Kaohsiung University of Science and Technology
2022-2023
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....