1. Department of Condition Monitoring and Test Services, Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden, Germany
2. Institute of Mechanics, Bochum University of Applied Sciences, Bochum, Germany
3. Department of Industrial Engineering, Università degli Studi di Napoli Federico II, Naples, Italy
4. German Aerospace Center, Institute of Composite Structures and Adaptive Systems, Braunschweig, Germany
5. Department of Terahertz Photonics, Goethe University of Frankfurt am Main, Frankfurt am Main, Germany
6. Acoustic and Electromagnetic Methods Division, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
7. Institute for Mathematics, Mechanics and Informatics, Kuban State University, Krasnodar, Russia
8. Department of Non-Destructive Testing & Quality Assurance, Saarland University, Saarbrücken, Germany