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Fast thickness measurements with frequency modulated continuous wave terahertz radiation

: Schreiner, Nina S.; Baccouche, Bessem; Sauer-Greff, Wolfgang; Urbansky, Ralph; Friederich, Fabian


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)
Article No. 7758594, 2 pp.
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <41, 2016, Copenhagen>
Conference Paper
Fraunhofer IPM ()
Thickness Measurement; Frequency Modulation; Submillimetre Wave Measurement; Multilayer Plastics; Terahertz Radiation

Broadband laser based terahertz systems for multilayer thickness inspections are getting established in industrial environments, such as in the quality control for paint processes in the automotive industry. Within this contribution we address another highly attractive and complementary industrial terahertz application by the thickness and density inspection of thick and multilayer plastics as for example in the field of tube production. In order to inspect plastic layers from millimeter to several tens of centimeters thickness at measurement rates of up to several kilohertz, we use electronic frequency modulated continuous wave terahertz systems operating in the terahertz regime below 500 GHz.