Miniaturized Design of Electromagnetic Acoustic Transducer and Its Application in Defect Detection

作者：Fang Wang, Feng Yang, Jie Li, Chunlei Tu, Mengqian Tian, Xingsong Wang · 年份：2025 · DOI：10.1109/m2vip67511.2025.11165559 · 被引用次数：1 · 研究领域：Industrial Vision Systems and Defect Detection、Non-Destructive Testing Techniques、Ultrasonics and Acoustic Wave Propagation

To address the limitations of bulky size and low energy conversion efficiency in conventional electromagnetic acoustic transducers (EMATs), this study proposes a miniaturized EMAT optimized for surface defect detection in thick steel plates. A two-dimensional multiphysics simulation model is developed in COMSOL to analyze the transduction process. Key design parameters including magnet geometry, coil configuration, and lift-off distance are optimized using orthogonal experimental design, resulting in a 52.4% volume reduction and a 4.9% increase in signal amplitude. To mitigate the performance degradation caused by miniaturization, a complementary ensemble empirical mode decomposition algorithm is employed, improving the signal-to-noise ratio (SNR) from 10 dB to 28.73dB. Experimental validation demonstrates strong beam directivity with a 12.93° half-angle and a sidelobe suppression ratio of 13.78dB. The surface wave velocity deviates by only 1.25% from the theoretical value, and the defect localization error remains within 1 mm. The proposed EMAT offers a compact, non-contact solution with high precision and robustness, well suited for robotic nondestructive testing (NDT) in complex industrial environments.