Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Alexander Viskov

Frank Niese

Gerhard Hübschen

Hans-Jürgen Salzburger

An electromagnetic ultrasonic transducer for coupling-media-free generation and/or reception of ultrasonic waves in the form of linearly polarized transverse waves in and from a workpiece is disclosed, having at least one unit which converts the ultrasonic waves inside the workpiece and which is provided with a coil for generating, and/or detecting a high-frequency magnetic field and premagnetizing unit for generating a quasi-static magnetic field which superimposes the high-frequency magnetic field in the workpiece The coil is disposed in a torus-shape on at least one partially toroidal or U-shaped magnetic core, having two front ends which can be turned to face the workpiece. The front ends of the magnetic core, which can be turned to face the workpiece, are connected directly or indirectly to a magnetic flux piece which has a surface facing the workpiece and connecting the front ends with each other.

Electromagnetic ultrasound converter

Disclosed is an electromagnetic ultrasonic probe for coupling-media-free generation and reception of ultrasonic waves in the form of linearly polarized transverse waves in a workpiece (), and from a workpiece (), having a unit which generates the ultrasonic waves inside the workpiece () and which is provided with a transmission coil arrangement (), to which a high-frequency voltage can be applied to generate a high-frequency magnetic field, and a premagnetizing unit (V) to generate a quasi-static magnetic field superimposed on the high-frequency magnetic field in the workpiece (), and an ultrasonic waves reception unit providing a reception coil arrangement (), with the transmission coil arrangement () and the reception coil arrangement () being disposed torus-shaped at least on one partially toroidally designed magnetic core (), which is provided with two front ends () which can be turned to face the workpiece () and via which the high-frequency magnetic fields can be coupled into, respectively coupled out of, the workpiece (). The premagnetizing unit (V) is contactable directly or indirectly with the workpiece () through a contact area () and by the at least one partially toroidally-shaped magnetic core () is disposed laterally next to the contact area () of the premagnetizing unit (V) so that the premagnetizing unit (V) can project over the partially toroidally designed magnetic core () perpendicular to the contact area ().

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Saarbrucken, Germany

Alexander Viskov