Method and device for scanning by means of a focused ultrasonic beam

摘要

A segment C' located in a medium constituted by a test-piece is scanned by means of a focused ultrasonic beam formed by a focusing transducer which is immersed in a couplant fluid such as water. In order to displace a focal point of the ultrasonic beam within the test-piece and to scan the segment C', the focus of the transducer is displaced in translational motion along a curve segment C which is the optical image of the segment C' in the interface between the test-piece and the couplant fluid.