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Appl. Sci. 2017, 7(4), 364; doi:10.3390/app7040364

Spectral Domain Optical Coherence Tomography for Non-Destructive Testing of Protection Coatings on Metal Substrates

1
Department of Photonics and Terahertz Technology, Ruhr Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
2
Deutsches Bergbau-Museum Bochum, Material Sciences, Herner Straße 45, 44787 Bochum, Germany
3
Faculty of Electrical Engineering, Information Technology and Business Engineering, Technische Hochschule Georg Agricola, Herner Straße 45, 44787 Bochum, Germany
*
Author to whom correspondence should be addressed.
Received: 1 March 2017 / Revised: 29 March 2017 / Accepted: 31 March 2017 / Published: 6 April 2017
(This article belongs to the Special Issue Development and Application of Optical Coherence Tomography (OCT))
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Abstract

In this paper we demonstrate that optical coherence tomography (OCT) is a powerful tool for the non-destructive investigation of transparent coatings on metal substrates. We show that OCT provides additional information which the common practice electrical impedance spectroscopy (EIS) cannot supply. First, coating layer thicknesses were measured and compared with reference measurements using a magnetic inductive (MI) measurement technique. After this validation of the OCT measurements, a customized sectioned sample was created to test the possibility to measure coating thicknesses with underlying corrosion, which cannot be analyzed accurately by MI or EIS measurements. Finally, we demonstrate the benefit of OCT on a standard sample. The OCT measurements provide the correct coating layer thickness with high lateral resolution and even enable metal and corrosion layers to be distinguished from each other. View Full-Text
Keywords: optical coherence tomography; non-destructive testing; layer thickness measurement, protective coatings optical coherence tomography; non-destructive testing; layer thickness measurement, protective coatings
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Lenz, M.; Mazzon, C.; Dillmann, C.; Gerhardt, N.C.; Welp, H.; Prange, M.; Hofmann, M.R. Spectral Domain Optical Coherence Tomography for Non-Destructive Testing of Protection Coatings on Metal Substrates. Appl. Sci. 2017, 7, 364.

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