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<p>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&#xa0;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.</p>

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A Hybrid EMAT-Optical Ultrasonic Detection Method of Plate Thickness Measurement Based on ZGV Lamb Waves

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Zenghua Liu,
  • Yu Zhang,
  • Xiaoran Wang,
  • Cunfu He

摘要

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.