Pol Grasland-Mongrain edited The_absorption_of_the_laser__.tex  over 8 years ago

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\end{equation}  where $\theta$ is the angle between the applied force and the considered point (r,$\theta$,z), $c_p$ and $c_s$ the compression and shear wave speed respectively, $\tau$ the time and $f_{NF}(t)$ representing near-field effects. The three terms correspond respectively to the far-field compression wave, the far-field shear wave and the near-field component.   Displacements along Z  are then computed by convoluting equal to the convolution between the  time and spatial extent of the force $H_y (x,y,z,t)$ with $G_{yz}$: $u_z=G_{yz}*H_y$. $G_{yz}$.  The Using a  medium density $\rho$ was taken equal to of  1000 kg.m$^{-3}$, the a  compression wave speed to of  1500 m.s$^{-1}$ and the a  shear wave speed to of  5.5 m.s$^{-1}$. m.s$^{-1}$, we calculated the displacements along Z.  Results are shown on Figure \ref{figGreen}-(A) which represents displacement mapsbetween each frame  along Z axis between each frame,  1.0, 1.5, 2.0, 2.5 and 3.0 ms after force application. The normalized displacement maps present many similarities with the low-energy experimental results of the Figure \ref{Figure2}, with a initial central displacement directed outside the medium and the propagation of three half cycles.