Experimental and theoretical study of acoustic waves generated by a laser line pulse in an optically absorptive isotropic cylinder

2010 ◽  
Vol 127 (1) ◽  
pp. 181-185 ◽  
Author(s):  
D. Ségur ◽  
A. L. Shuvalov ◽  
B. Audoin ◽  
Y. D. Pan
Keyword(s):  
Acoustic Waves ◽  
Theoretical Study ◽  
Laser Line ◽  
Isotropic Cylinder

scholarly journals Interaction acoustic waves with a layered structure containing layer of bubbly liquid

2018 ◽  
Vol 148 ◽  
pp. 15006
Author(s):  
Damir Gubaidullin ◽  
Anatolii Nikiforov
Keyword(s):  
Acoustic Waves ◽  
Theoretical Study ◽  
Bubbly Liquid ◽  
Air Bubbles ◽  
Angle Of Incidence ◽  
Natural Oscillations ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Gel Layer ◽  
Transmission And Reflection

The results of a theoretical study of the effect of a bubble layer on the propagation of acoustic waves through a thin three-layered barrier at various angles of incidence are presented. The barrier consists of a layer of gel with polydisperse air bubbles bounded by layers of polycarbonate. It is shown that the presence of polydisperse air bubbles in the gel layer significantly changes the transmission and reflection of the acoustic signal when it interacts with such an obstacle for frequencies close to the resonant frequency of natural oscillations of the bubbles. The frequency range is identified where the angle of incidence has little effect on the reflection and transmission coefficients of acoustic waves.

Acoustic waves generated by a laser point source in an isotropic cylinder

2004 ◽  
Vol 116 (2) ◽  
pp. 814-820 ◽  
Author(s):  
Yongdong Pan ◽  
Clément Rossignol ◽  
Bertrand Audoin
Keyword(s):  
Point Source ◽  
Acoustic Waves ◽  
Isotropic Cylinder

scholarly journals Experimental study of guiding and filtering of acoustic waves in a two dimensional ultrasonic crystal

2005 ◽  
Vol 220 (9-10) ◽  
Author(s):  
Abdelkrim Khelif ◽  
Abdelkrim Choujaa ◽  
Sarah Benchabane ◽  
Bahram Djafari-Rouhani ◽  
Vincent Laude
Keyword(s):  
Band Gap ◽  
Acoustic Waves ◽  
Theoretical Study ◽  
Phononic Crystal ◽  
Wide Frequency Range ◽  
Two Dimensional ◽  
Full Band ◽  
Side Walls ◽  
Difference Time ◽  
Good Agreement

AbstractWe present a combined experimental and theoretical study of the guiding, bending and filtering of acoustic waves in an ultrasonic crystal. The crystal consists of a two-dimensional periodical array of steel rods immersed in water, for wich a complete acoustic band gap extending from 240 to 325 kHz is found experimentally. Waveguides for acoustic waves are further created by removing a line defect, on which stubs can be added by removing rods from the side-walls of the waveguide. Full transmission is observed for a one-period-wide straight waveguide within the full-band-gap of the perfect phononic crystal, i.e. for a waveguide aperture smaller than one acoustic wavelength. Waveguiding over a wide frequency range is also obtained for a one-period-wide waveguide with two sharp 90° bends. Finite-difference time-domain computations are found to be in good agreement with the measurements in all experimental configurations.

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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