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Continuous wave terahertz inspection of glass fiber reinforced plastics with semi-automatic 3-D image processing for enhanced defect detection

: Friederich, F.; Cristofani, E.; Matheis, C.; Jonuscheit, J.; Beigang, R.; Vandewal, M.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
International Microwave Symposium, IMS 2014 : 1-6 June 2014, Tampa Bay, Florida
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3868-1
ISBN: 978-1-4799-3869-8
4 S.
International Microwave Symposium (IMS) <2014, Tampa Bay/Fla.>
Fraunhofer IPM ()
filled polymers; flaw detection; glass fibre reinforced plastics; image processing; terahertz wave imaging

The increasing industrial application of fiber reinforced plastics demands developments of new techniques for non-destructive testing. The sub-terahertz frequency band has proved to be a noteworthy option for this task. Composite structures or laminates can be inspected for foreign inclusions, delaminations, debonds, etc., using sub-terahertz sensors during the manufacturing process or maintenance. In this contribution we present our results using a frequency modulated continuous wave terahertz imaging system in comparison with conventional NDT measurements on several different GFRP samples. Thereby a semi-automatic terahertz image processing approach for enhanced defect detection is applied.