An approach to surface waves velocity dispersion in inhomogeneous material surfaces

Kapelewski, J.; Dukata, A.

doi:10.1051/jp4:2006137022

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2008

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“…These results show that the linear chirp modulation of the SAW signal is only moderately effective for scanners based on anisotropic crystals. For optimal energy focusing in devices of this type, authors of [7,10,11] recommend non-linear chirped SAW.…”

Section: Resultsmentioning

confidence: 99%

The Focused Beam Forming with a Monolithic 2D Phased Array

Lila

Kapelewski

2008

Acta Phys. Pol. A

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A new type of the monolithic acoustic scanner based on a near-surface quasicomposite two-dimensional array, implemented in the solid elastic substrate was proposed. It provides a simple means of focusing and scanning a beam of acoustic waves, radiated into the depth of the elastic solid substrate. A chirped surface acoustic wave is converted into a focused bulk wave by scattering from an array composed of a 2D periodic system of regions with varying material parameters, located at the surface of a surface acoustic waves substrate. In the paper, a simple numerical simulation model is presented to analyse the influences of the dynamical and geometrical parameters of the surface structure, as well as the influences of incident surface acoustic waves signal profile on the focal distribution.

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Section: Resultsmentioning

confidence: 99%