Abstract

A new solution to the problem of controllable focusing of ultrasonic beams is given. It consists in that the application of a nonuniform electric field of special configuration in piezoelectrics and ferroelectric ceramics causes a quadratic change of the velocity in the cross-section of an ultrasonic beam A new type of a controllable device for acoustic beams focusing - an electroacoustic lens - has been made. The dependence has been established of the focal length on the lens length and aperture as well as on the control voltage value and electroacoustic parameters of the material.

Table of contents |Full Text|

1. Introduction
2. Electroacoustic lenses made of electrostrictional ferroelectric ceramics
3. Electroacoustic lenses based on piezoelectric crystals
4. Experimental results and discussion
5. References