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A Hybrid EMAT-Optical Ultrasonic Detection Method of Plate Thickness Measurement Based on ZGV Lamb Waves
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DOI：10.1007/s11220-026-00757-z.png)
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Abstract
En 中文
Laser ultrasonic demonstrates inherent suitability for zero group velocity (ZGV) Lamb wave inspection technology due to its broadband frequency characteristics, high energy density, and multi-modal excitation capabilities. However, practical implementations face challenges including structural complexity, elevated costs, and limited anti-interference performance. To overcome these limitations, this study developed a novel non-contact hybrid detection system integrating electromagnetic acoustic transducer (EMAT) and optical ultrasonic technologies (laser interferometric ultrasonic technologies). A thickness measurement methodology employing ZGV Lamb waves was established through this hybrid configuration. Experimental validation was conducted on aluminum plates with continuous thickness gradients (1-5 mm), achieving thickness measurements with maximum relative errors constrained below 6%. The methodology's validity received further confirmation. This advancement holds critical significance for detecting thickness-induced defects in plate materials, particularly in industrial inspection scenarios requiring high reliability.
Keywords:
Zero group velocity (ZGV) Lamb waves
EMAT-optics hybrid system
Plate
Thickness measurement
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2
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103
Citations:
618
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Cited Papers