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Highly accurate thickness measurement of multi-layered automotive paints using terahertz technology

: Krimi, Soufiene; Klier, Jens; Jonuscheit, Joachim; Freymann, Georg von; Urbansky, Ralph; Beigang, René

Postprint urn:nbn:de:0011-n-4106664 (992 KByte PDF)
MD5 Fingerprint: d6df116f85acb463163ba23d8098809b
Copyright AIP
Erstellt am: 30.8.2016

Applied Physics Letters 109 (2016), Nr.2, Art. 021105, 4 S.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
Terahertz Time Domain Spectroscopy; thickness measurement; Terahertz radiation

In this contribution, we present a highly accurate approach for thickness measurements of multilayered automotive paints using terahertz time domain spectroscopy in reflection geometry. The proposed method combines the benefits of a model-based material parameters extraction method to calibrate the paint coatings, a generalized Rouard’s method to simulate the terahertz radiation behavior within arbitrary thin films, and the robustness of a powerful evolutionary optimization algorithm to increase the sensitivity of the minimum thickness measurement limit. Within the framework of this work, a self-calibration model is introduced, which takes into consideration the real industrial challenges such as the effect of wet-on-wet spray in the painting process.