DEVICE AND METHOD FOR ELECTROMAGNETIC ACOUSTIC CONTROL OF MATERIAL AND/OR MEASUREMENT OF THICKNESS OF TESTED OBJECT THAT INCLUDES AT LEAST ELECTRO-CONDUCTIVE AND FERROMAGNETIC COMPONENTS

摘要

The invention relates to a device and a method for testing the material of a test object (4), which contains at least electrically conductive and ferromagnetic material fractions and has at least one engineered surface (5), by means of at least one electromagnetic ultrasonic transducer assembly (EMUS). Said assembly comprises a permanent or electromagnetic assembly (1) comprising at least two magnetic poles (N, S) of a differing polarity that face the engineered surface (5), in addition to an eddy current coil (2) that is placed in close proximity to the engineered surface (5) between the two magnetic poles (N, S) in direct or indirect relation to said surface (5). The invention is characterised in that the eddy current coil (2) is configured and arranged in such a way that when said coil (2) is supplied with an alternating current, free ultrasonic waves that run essentially perpendicular to the engineered surface (5) are generated and propagate inside the test object (4).