Vorrichtung zur Materialpruefung und/oder Dickenmessung an einem wenigstens elektrisch leitende und ferromagnetische Materialanteile aufweisenden Pruefobjekt

DE1004054423 B UPAB: 20060623 NOVELTY - Apparatus tests the material of a test object which has at least one surface. The apparatus has an electromagnetic ultrasound convertor arrangement having a permanent magnet arrangement or an electromagnet arrangement and at least one eddy current coil. The coil (2) has an electrically conductive track arrangement arranged on or parallel to a surface area of a rolling body (5) which rolls over the surface of the test body (4). The surface area rolls together with the roller body. DETAILED DESCRIPTION - INDEPENDENT CLAIMS also cover the use of the above apparatus. USE - For testing for faults in metal sheets, rails, tubes, train wheels, oil containers, or the outer skin of ships or security containers. ADVANTAGE - The novel apparatus requires no or hardly any friction.