scholarly journals Experimental Study on the Mode Conversion of Lamb Waves in a Metal Plate of Stepped Thickness Using Optical Detection

2010 ◽  
Vol 17 (2) ◽  
pp. 201-204 ◽  
Author(s):  
Kazuhiko IMANO
Keyword(s):  
Experimental Study ◽  
Lamb Waves ◽  
Mode Conversion ◽  
Optical Detection ◽  
Metal Plate

A baseline-free approach of locating defect based on mode conversion and the reciprocity principle of Lamb waves

Ultrasonics ◽  
2020 ◽  
Vol 102 ◽  
pp. 106063
Author(s):  
Hongbo Jia ◽  
Hongwei Liu ◽  
Zhichun Zhang ◽  
Fuhong Dai ◽  
Yanju Liu ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Mode Conversion ◽  
Reciprocity Principle

scholarly journals Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

2019 ◽  
Vol 9 (3) ◽  
pp. 459 ◽  
Author(s):  
Qingnan Xie ◽  
Chenyin Ni ◽  
Zhonghua Shen
Keyword(s):  
Defect Detection ◽  
Lamb Waves ◽  
Mode Conversion ◽  
High Sensitivity ◽  
Laser Source ◽  
Dispersion Characteristics ◽  
High Attenuation ◽  
Corrosion Defects ◽  
Detection And Localization ◽  
Lateral Excitation

When working in humid environments, corrosion defects are easily produced in metallic plates. For defect detection in underwater plates, symmetric modes of Lamb waves are widely used because of their characteristics including long propagating distance and high sensitivity to defects. In this study, we extend our previous work by applying the laser laterally generated S0 mode to detection and localization of defects represented by artificial notches in an aluminum plate immersed in water. Pure non-dispersive S0 mode is generated in an underwater plate by lateral laser source irradiation and its fd (frequency·thickness) range is selected by theoretical calculation. Using this lateral excitation, the S0 mode is enhanced; meanwhile, the A0 mode is effectively suppressed. The mode-converted A0 mode from the incident S0 mode is used to detect and localize the defect. The results reveal a significantly improved capability to detect defects in an underwater plate using the laser laterally generated S0 mode, while that using A0 is limited due to its high attenuation. Furthermore, owing to the long propagating distance and the non-dispersion characteristics of the S0 generated by the lateral laser source, multiple defects can also be detected and localized according to the mode conversion at the defects.

scholarly journals Experimental Study of Lamb Waves Propagation inside an Impact Damage in the Size of the Used Wavelength

2020 ◽  
Vol 56 (2) ◽  
pp. 141-150
Author(s):  
S. Taleb ◽  
L. Rittmeier ◽  
M. Sinapius ◽  
F. Boubenider ◽  
D. Schmidt
Keyword(s):  
Experimental Study ◽  
Lamb Waves ◽  
Impact Damage ◽  
Waves Propagation

scholarly journals Air coupled ultrasonic inspection with Lamb waves in plates showing mode conversion

Ultrasonics ◽  
2020 ◽  
Vol 100 ◽  
pp. 105984 ◽  
Author(s):  
Arno Römmeler ◽  
Peter Zolliker ◽  
Jürg Neuenschwander ◽  
Valentin van Gemmeren ◽  
Mario Weder ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Mode Conversion ◽  
Ultrasonic Inspection
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