scholarly journals AIR-COUPLED SURFACE WAVE TRANSMISSION MEASUREMENT ACROSS A PARTIALLY CLOSED SURFACE-BREAKING CRACK IN CONCRETE

2011 ◽  
Author(s):  
Seong-Hoon Kee ◽  
Jinying Zhu ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Surface Wave ◽  
Closed Surface ◽  
Wave Transmission ◽  
Transmission Measurement ◽  
Surface Breaking Crack

scholarly journals A Practical Guide to Source and Receiver Locations for Surface Wave Transmission Measurements across a Surface-Breaking Crack in Plate Structures

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3793
Author(s):  
Janghwan Kim ◽  
Seong-Hoon Kee ◽  
Jin-Wook Lee ◽  
Ma. Doreen Candelaria
Keyword(s):  
Surface Wave ◽  
Wave Transmission ◽  
Laser Vibrometer ◽  
Plate Structures ◽  
Reflected Waves ◽  
Practical Guide ◽  
Practical Guidelines ◽  
Transmission Measurements ◽  
Simulation Results ◽  
Surface Breaking Crack

The main objectives of this study are to investigate the interference of multiple bottom reflected waves in the surface wave transmission (SWT) measurements in a plate and to propose a practical guide to source-and-receiver locations to obtain reliable and consistent SWT measurements in a plate. For these purposes, a series of numerical simulations, such as finite element modelling (FEM), are performed to investigate the variation of transmission coefficient of surface waves across a surface-breaking crack in various source-to-receiver configurations in plates. Main variables in this study include the crack depths (0, 10, 20, 30, 40 and 50 mm), plate thicknesses (150, 200, 300, 400 and 800 mm), source-to-crack distances (100, 150, 200, 250 and 300 mm) and receiver-to-crack distances. The validity of numerical simulation results was verified by comparison with results from experiments using Plexiglas specimens using two types of noncontact sensors (laser vibrometer and air-coupled sensor) in the laboratory. Based on simulation and experimental results in this study, practical guidelines for sensor-to-receiver locations are proposed to reduce the effects of the interference of bottom reflected waves on the SWT measurements across a surface-breaking crack in a plate. The findings in this study will help obtain reliable and consistent SWT measurements across a surface-breaking crack in plate-like structures.

Loss Measurements of Surface Wave Transmission Lines

1954 ◽  
Vol 25 (6) ◽  
pp. 790-797 ◽  
Author(s):  
Elmer H. Scheibe ◽  
Bernard G. King ◽  
Donald L. Van Zeeland
Keyword(s):  
Surface Wave ◽  
Transmission Lines ◽  
Wave Transmission

Signal Processing Techniques to Detect a Surface-Breaking Crack by Using a Laser Surface Wave

2007 ◽  
Vol 51 (91) ◽  
pp. 358 ◽  
Author(s):  
Seung-Kyu Park ◽  
Sung-Hoon Baik ◽  
Young-Sang Joo ◽  
Hyun-Kyu Jung ◽  
Chang-Hwan Lim ◽  
...  
Keyword(s):  
Signal Processing ◽  
Surface Wave ◽  
Laser Surface ◽  
Processing Techniques ◽  
Surface Breaking Crack ◽  
Signal Processing Techniques
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