Wen Jiawei, Jiang Can, Chen Hao
Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2023 Dec 18;23(24):9902. doi: 10.3390/s23249902.
Corrosion detection for industrial settings is crucial for safe and efficient operations. Due to its high imaging resolution, the guided-wave full-waveform inversion tomography technique has significant potential for corrosion detection of plate metals. Limited by the long wavelengths of A0 and S0 mode waves, this method exhibits inadequate detection resolution for the earlier shallow and small corrosion defects. Based on the relatively short wavelength characteristics of the SH1 mode wave, we propose a high-precision corrosion detection method via SH1 guided wave using the full waveform inversion algorithms. By conducting finite element simulations of ultrasonic-guided waves on aluminum plates with varying corrosion defects, a comparison was made to assess the detection precision across A0, S0, and SH1 modes. The comparison results showed that, whether for regular or irregular defects, the SH1 mode wave always exhibited higher imaging accuracy than the A0 and S0 mode waves for shallow and small-sized defects. The corresponding experiments were conducted on an aluminum plate with simple or complex defects. The results of the experiments reconfirmed that the full waveform inversion method using SH1 guided wave can effectively reconstruct the shape and size of small and shallow corrosion defects within aluminum plates.
工业环境中的腐蚀检测对于安全高效运行至关重要。由于其高成像分辨率，导波全波形反演层析成像技术在板材金属腐蚀检测方面具有巨大潜力。受A0和S0模式波长较长的限制，该方法对早期浅层和小尺寸腐蚀缺陷的检测分辨率不足。基于SH1模式波相对较短的波长特性，我们提出了一种使用全波形反演算法的基于SH1导波的高精度腐蚀检测方法。通过对具有不同腐蚀缺陷的铝板进行超声导波的有限元模拟，进行了比较以评估A0、S0和SH1模式的检测精度。比较结果表明，无论是对于规则缺陷还是不规则缺陷，对于浅层和小尺寸缺陷，SH1模式波的成像精度始终高于A0和S0模式波。在具有简单或复杂缺陷的铝板上进行了相应实验。实验结果再次证实，使用SH1导波的全波形反演方法可以有效地重建铝板内小尺寸和浅层腐蚀缺陷的形状和尺寸。
