Acoustic waves generated by a line source in a viscoelastic anisotropic medium

1998 ◽  
Vol 72 (7) ◽  
pp. 774-776 ◽  
Author(s):  
B. Audoin ◽  
S. Guilbaud
Keyword(s):  
Anisotropic Medium ◽  
Acoustic Waves ◽  
Line Source

Diffraction of Cylindrical Waves by a Transmissive Half-Plane

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Yusuf Ziya Umul
Keyword(s):  
Half Plane ◽  
Acoustic Waves ◽  
High Frequency ◽  
Line Source ◽  
Geometrical Optics ◽  
Cylindrical Waves ◽  
Uniform Theory Of Diffraction ◽  
The Waves

The scattered acoustic waves by a transmissive half-plane, which is illuminated by a line source, are investigated. The high-frequency diffracted wave expressions are obtained by taking into account a resistive half-screen that is defined in electromagnetics. The uniform diffracted fields are expressed in terms of the Fresnel cylinder functions. The behavior of the waves is compared with the case when the uniform theory of diffraction is considered. The geometrical optics and diffracted fields are examined numerically.

scholarly journals Defect localization by an extended laser source on a hemisphere

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Veira Canle ◽  
Joni Mäkinen ◽  
Richard Blomqvist ◽  
Maria Gritsevich ◽  
Ari Salmi ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Line Source ◽  
3D Model ◽  
Scattering Problem ◽  
Laser Line ◽  
Experimental Results ◽  
Laser Source ◽  
Fem Simulations ◽  
Specific Direction ◽  
Defect Localization

AbstractThe primary goal of this study is to localize a defect (cavity) in a curved geometry. Curved topologies exhibit multiple resonances and the presence of hotspots for acoustic waves. Launching acoustic waves along a specific direction e.g. by means of an extended laser source reduces the complexity of the scattering problem. We performed experiments to demonstrate the use of a laser line source and verified the experimental results in FEM simulations. In both cases, we could locate and determine the size of a pit in a steel hemisphere which allowed us to visualize the defect on a 3D model of the sample. Such an approach could benefit patients by enabling contactless inspection of acetabular cups.

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