1. Team Leader, Dept. of Material Characterization, Defect Detection, Life Cycle Management, Fraunhofer Institute for Nondestructive Testing IZFP, Campus E3 1, 66123 Saarbrücken, Germany (corresponding author).
2. Director and Professor, Fraunhofer Fraunhofer Institute for Nondestructive Testing IZFP, Campus E3 1, 66123 Saarbrücken, Germany.
3. Professor, Fraunhofer Fraunhofer Institute for Nondestructive Testing IZFP, Campus E3 1, 66123 Saarbrücken, Germany.