Guided lamb waves and L-SAFT processing technique for enhanced detection and Imaging of corrosion defects in plates with small depth-to-wavelength ratio

被引：48

作者：

Sicard, R ^{[1
]}

Chahbaz, A ^{[1
]}

Goyette, J ^{[1
]}

机构：

[1] Univ Quebec Trois Rivieres, Ctr Inspect Ultrasons, Inst Rech Hydrogene, Trois Rivieres, PQ G9A 5H7, Canada

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2004年 / 51卷 / 10期

关键词：

D O I：

10.1109/TUFFC.2004.1350957

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

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.

引用

页码：1287 / 1297

页数：11