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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Guided Lamb waves and L-SAFT processing technique for enhanced detection and imaging of corrosion defects in plates with small depth-to wavelength ratio
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Guided Lamb waves and L-SAFT processing technique for enhanced detection and imaging of corrosion defects in plates with small depth-to wavelength ratio

机译：导引的Lamb波和L-SAFT处理技术可增强深度和波长比小的板中腐蚀缺陷的检测和成像

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摘要

The Lamb synthetic aperture focusing technique (L-SAFT) imaging algorithm in the Fourier domain is used to produce Lamb wave imaging in plates while considering the wave dispersive properties. This artificial focusing technique produces easy-to-interpret, modified B-scan type images of Lamb wave inspection results. The high level of sensitivity of Lamb waves combined with the L-SAFT algorithm allows one to detect and to produce images of corrosion defects with small depth-to-wavelength ratio. This paper briefly presents the formulated L-SAFT algorithm used for Lamb waves and, in more details, some experimental results obtained on simulated and real corrosion pits, demonstrating the benefit of combining L-SAFT with pulse-echo Lamb wave inspection. The obtained images of the real corrosion defects showed detection of pits with a depth-to-wavelength ratio of approximately 2/11.
机译：考虑到波的色散特性，傅里叶域中的Lamb合成孔径聚焦技术（L-SAFT）成像算法用于在板中产生Lamb波成像。这种人工聚焦技术可以生成易于理解的，改进的兰姆波检查结果的B扫描类型图像。兰伯波的高灵敏度与L-SAFT算法相结合，使人们能够以较小的深度波长比检测并生成腐蚀缺陷的图像。本文简要介绍了用于Lamb波的公式化L-SAFT算法，并更详细地介绍了在模拟和真实腐蚀坑上获得的一些实验结果，证明了将L-SAFT与脉冲回波Lamb波检测相结合的好处。所获得的真实腐蚀缺陷图像显示出深度/波长比约为2/11的凹坑的检测。

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