Strong rough-surface wave reflection

1995 ◽  
Author(s):  
Alexander N. Teokharov
Keyword(s):  
Surface Wave ◽  
Rough Surface ◽  
Wave Reflection

Comparison of surface-wave reflection coefficients for different metals on quartz

1973 ◽  
Vol 9 (21) ◽  
pp. 495 ◽  
Author(s):  
R. Larosa ◽  
C.F. Vasile ◽  
D.V. Zagardo
Keyword(s):  
Surface Wave ◽  
Wave Reflection ◽  
Reflection Coefficients

Surface‐wave reflection phenomena at interfaces ony‐zLiNbO3

1979 ◽  
Vol 50 (11) ◽  
pp. 6719-6728 ◽  
Author(s):  
W. S. Goruk ◽  
G. I. Stegeman
Keyword(s):  
Surface Wave ◽  
Wave Reflection

Numerical Study of Detection of Crack on Corroded Rough Surface Using EMAT-Generated Surface Wave

2021 ◽  
Author(s):  
Zhe Wang ◽  
Xuedong Chen ◽  
Zhichao Fan ◽  
Wei Chen ◽  
Jingwei Cheng ◽  
...  
Keyword(s):  
Surface Wave ◽  
Rough Surface ◽  
Numerical Study ◽  
Element Model ◽  
Center Frequency ◽  
Detection Accuracy ◽  
Electromagnetic Acoustic Transducer ◽  
Acoustic Surface Wave ◽  
Excitation Region ◽  
Acoustic Transducer

Abstract Electromagnetic acoustic transducer (EMAT) gradually becomes the main excitation method for surface wave, which is suitably used in periodic inspection or long-term monitoring of pressure equipment. However, the corroded surfaces appearing on the pressure pipes and vessels can cause an increase of background noise and remarkable attenuation of the echo wave, which restrict the improvement of detection accuracy of surface crack. In this paper, a finite element model of EMAT-Generated surface wave inspection for steel plate with rough surface is established based on the constitutive equation of ferromagnetic materials. Considering the Lorentz force and magnetostrictive effect, the influences of rough surface on energy conversion of multiple fields in the excitation and propagation process of electromagnetic acoustic surface wave are separately investigated. The surface wave responses of cracks characterized by rectangular groove on corroded rough surface have been analyzed further. The numerical results indicate that the rough surface of the excitation region below the transducer with a center frequency of 330 kHz has a slight effect on the surface wave energy, while the surface roughness of the propagation region attenuates echo signal of crack significantly. The reflection coefficients of echo signals can be utilized to quantitatively characterize the depth of crack on the corroded surface with roughness less than λ/15 (λ is wavelength of surface wave).

Surface-wave suppression band gap and plane-wave reflection phase band of mushroomlike photonic band gap structures

2008 ◽  
Vol 103 (2) ◽  
pp. 023513 ◽  
Author(s):  
Long Li ◽  
Qiang Chen ◽  
Qiawei Yuan ◽  
Changhong Liang ◽  
Kunio Sawaya
Keyword(s):  
Surface Wave ◽  
Plane Wave ◽  
Band Gap ◽  
Wave Reflection ◽  
Photonic Band Gap ◽  
Reflection Phase ◽  
Photonic Band Gap Structures ◽  
Photonic Band

Width of the wave reflection pattern of a statistically rough surface

1981 ◽  
Vol 24 (2) ◽  
pp. 138-141
Author(s):  
L. V. Khomyakova ◽  
E. A. Shtager
Keyword(s):  
Rough Surface ◽  
Wave Reflection ◽  
Reflection Pattern

S-wave reflection and surface wave surveys in liquefaction affected areas: a case study of the Hinode area, Itako, Ibaraki, Japan

2017 ◽  
Vol 48 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Toshiyuki Yokota ◽  
Motoharu Jinguuji ◽  
Yoshiaki Yamanaka ◽  
Kazunori Murata
Keyword(s):  
Surface Wave ◽  
Wave Reflection ◽  
S Wave
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