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Non-destructive measurement of thickness and refractive index of multilayer coating on metal substrate

: Nguyen, Dinh T.; Weber, Katharina; Wegmann, Volker; Hernandez, Yves


Institute of Electrical and Electronics Engineers -IEEE-:
41st International Conference on Infrared, Millimeter, and Terahertz waves, IRMMW-THz 2016 : 25-30 September 2016, Copenhagen, Denmark
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-4673-8485-8 (Electronic)
ISBN: 978-1-4673-8486-5 (Print on Demand)
2 S.
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <41, 2016, Copenhagen>
Fraunhofer IPA ()
zerstörungsfreie Prüfung; multilayer coatings; Schichtdickenmessung

Automotive coating plays an important role in car industry. They protect the car bodies from various aggressive weathering and mechanical deformations. Although many techniques have been developed for car coating, there is still a demand for non-destructive characterization of multilayer coatings. Therefore, research on new measurement methods is still ongoing. In this paper, we investigate thin coating layers on metal substrate using THz time-domain spectroscopy (THz-TDS). We are able to apply existing algorithm but in reflection method using THz-TDS to distinguish the thickness as thin as 20μm of individual layers.