Highly accurate thickness measurement of multi-layered automotive paints using terahertz technology
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern (Germany)
- Fraunhofer Institute for Physical Measurement Techniques IPM, 67663 Kaiserslautern (Germany)
- Department of Communications Engineering, University of Kaiserslautern, 67663 Kaiserslautern (Germany)
In this contribution, we present a highly accurate approach for thickness measurements of multi-layered 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.
- OSTI ID:
- 22590587
- Journal Information:
- Applied Physics Letters, Vol. 109, Issue 2; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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