Netzelmann, UdoUdoNetzelmannWalle, GünterGünterWalleEhlen, A.A.EhlenLugin, SergeySergeyLuginFinckbohner, MichaelMichaelFinckbohnerBessert, SteffenSteffenBessert2022-03-132022-03-132016https://publica.fraunhofer.de/handle/publica/39146510.1063/1.4940613Induction or eddy current thermography is used to detect surface cracks in ferritic steel. The technique is applied to detect surface cracks in rails from a moving test car. Cracks were detected at a train speed between 2 and 15 km/h. An automated demonstrator system for testing railway wheels after production is described. While the wheel is rotated, a robot guides the detection unit consisting of inductor and infrared camera over the surface.encrack detectioninduced thermographyeddy current thermographyferritic steelconference paper