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Abstract
ABSTRACT Electromagnetic acoustic resonance (EMAR) technology has potential to improve signal-to-noise ratio (SNR) and reduce noise effects in metal plate thickness measurement. However, using traditional EMAR to detect inhomogeneous-thickness specimens can result in difficulties accurately determining thickness and identifying interfaces due to multiple resonant frequencies. This paper proposes a signal processing method called frequency-frequency energy density separation (FFEDS) to obtain the energy density ratio (EDR) for different thicknesses using EMAR. A new coil structure, the Acentric Archimedes Spiral Coil (A-AS-Coil), and two scanning schemes (transverse and rotational) are designed. Experimentally, transverse scanning with the A-AS-Coil shows a nonlinear change in EDR, improving sensitivity in identifying interfaces. Rotational scanning with the A-AS-Coil increases the change in EDR by 106.2%, different from the conventional spiral coil.
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