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Delayed reflection in a stratified acoustic strip

✍ Scribed by Virginie Régnier

Book ID
102512983
Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
187 KB
Volume
28
Category
Article
ISSN
0170-4214

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✦ Synopsis

The wave propagation in an acoustic horizontal strip with height H and with Neumann condition at the lower boundary and Dirichlet condition at the upper one, is studied. The propagation velocity c is a piecewise constant function with two di erent values on the left and on the right of the vertical interface (simple vertical stratiÿcation of the medium). Using previous results found by Ali Mehmeti and Croc=Dermenjian on the spectral analysis of the problem, we detect a phenomenon of delayed re ection for narrow beams of waves hitting the interface with an angle of incidence large enough. That delay already estimated in the one-dimensional case by Ali Mehmeti=RÃ egnier with analogous techniques, is materialized in dimension two by the Goos-H anchen shift, experimentally measured by Haibel=Nimtz in 2001.

📜 SIMILAR VOLUMES

Inverse problem for a perturbed stratifi
Inverse problem for a perturbed stratified strip in two dimensions
✍ Michel Cristofol; Patricia Gaitan 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 153 KB

## Abstract We consider the divergence form elliptic operator __A__=−∇~__x__,__z__~·(__c__^2^(__x__,__z__) ∇~__x__,__z__~) in the strip Ω=ℝ× [0,__H__]. The velocity __c__(__x__,__z__) describes the multistratification of Ω: a horizontal stratification with a compact perturbation __K__, the velocity