Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4955407
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- Innovation Center of Applied System Modeling in Kaiserslautern
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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. Published by AIP Publishing.
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