The Focused Beam Forming with a Monolithic 2D Phased Array

Abstract

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 in∞uences of the dynamical and geometrical parameters of the surface structure, as well as the in∞uences of incident surface acoustic waves signal proflle on the focal distribution.