Attenuating acoustic pulse propagation in multilayered rods

Pulse Broadening in Multilayered Fibers

The fabrication of overmoded fibers by chemical vapourdeposition (eVD) requires many successive layers in order to approximate a given index profile. The more layers one deposits, the better the approximation to the index profile is, and the closer one gets to the performances of' the smooth profile fiber. It is important to know, if one wants to approach the characteristics of a given smooth p...

The Time-marched Ffp for Modeling Acoustic Pulse Propagation

Implementation of a collocated Boundary Element Method for acoustic wave propagation in multilayered fluid media

The numerical solution of the Helmholtz equation with nonlocal radiation boundary conditions is considered. We model sound wave propagation in a multilayered piecewise homogeneous medium. A fourth-order accurate collocated, boundary element method is used, where the solution inside the domain is computed through a representation integral. The method is shown to have the expected fourth-order co...

The propagation of a pulse in the real strings and rods

We consider the elastic rod of a large mass M , the left end of which is fixed to a body of mass m << M and the second body of mass m is fixed to the right end of the rod. The force of the delta-function form is applied to the left side of the rod. We find the propagation of the pulse in the system. Our problem represents the missing problem in the Newton “Principia mathematica” and in any text...

Diffuse photon propagation in multilayered geometries.

Diffuse optical tomography (DOT) is an emerging functional medical imaging modality which aims to recover the optical properties of biological tissue. The forward problem of the light propagation of DOT can be modelled in the frequency domain as a diffusion equation with Robin boundary conditions. In the case of multilayered geometries with piecewise constant parameters, the forward problem is ...