this is for holding javascript data
Pol Grasland-Mongrain edited Absorption_of_the_laser_beam__.tex
almost 8 years ago
Commit id: 8c9fae5e9841ba14011794d23317ec53ab4008ab
deletions | additions
diff --git a/Absorption_of_the_laser_beam__.tex b/Absorption_of_the_laser_beam__.tex
index 6b6139c..f3d3b87 100644
--- a/Absorption_of_the_laser_beam__.tex
+++ b/Absorption_of_the_laser_beam__.tex
...
\end{equation}
Substituting the same experimental parameters used previously along with $\alpha$ = 70.10$^{-6}$ K$^{-1}$ (water linear thermal dilatation coefficient), we obtain a displacement $u_z$ of 0.025 $\mu$m. This value is very close to the measured experimental displacement (about 0.02 $\mu$m). Note that both the experimental and theoretical central displacements are directed towards the outside of the medium (see white circle arrow in Figures \ref{figElastoPVA}-(A) and \ref{figGreen}-(A)).
To calculate the propagation of the displacements as shear waves, we must first consider the transverse dilatation, which leads to stronger displacements than those occurring along the Z axis. We thus modeled the thermoelastic regime in 2D as two opposite forces directed along the Y axis with a depth of 40 $\mu$m and with an amplitude decreasing linearly respectively from 2.5 to 0 mm and from -2.5 to 0
mm \cite{Davies_1993}. mm. The magnitude of the force along space and time is stored in a matrix, $H_y^{thermo}(y,z,t)$. Displacements along the Z axis are then equal to the convolution between $H_y^{thermo} (y,z,t)$ and $G_{yz}$ \cite{aki1980quantitative}:
\begin{equation}
G_{yz} = \frac{\cos \theta \sin \theta}{4\pi \rho r} (\frac{1}{c_p^2} \delta_P - \frac{1}{c_s^2} \delta_S +\frac{3}{r^2} \int\limits_{r/c_p}^{r/c_s}{\tau \delta_\tau d\tau})
\label{eq:Gyz}