Udo Netzelmann studied physics at the Ruhr-University in Bochum, where he gained a Ph.D. in experimental solid state physics in 1986. Since 1989, he has been working at the Fraunhofer Institute for Nondestructive Testing in Saarbruecken. His main interests are thermal, acoustic and microwave testing techniques for defect detection and materials characterization. He is Senior Lead Scientist Optics and Quasi Optics in the CoE for Sensor-based Solutions and Application.