Spectral domain optical coherence tomography for non-destructive testing of protection coatings on metal substrates
- 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.
| Author: | Marcel LenzGND, Cristian MazzonGND, Christopher DillmannGND, Nils Christopher GerhardtGND, Hubert WelpGND, Michael PrangeGND, Martin HofmannGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-58870 |
| DOI: | https://doi.org/10.3390/app7040364 |
| Parent Title (English): | Applied Sciences |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2018/07/10 |
| Date of first Publication: | 2017/04/06 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Tag: | Open Access Fonds layer thickness measurement; non-destructive testing; optical coherence tomography; protective coatings |
| Volume: | 7 |
| Issue: | 4 |
| First Page: | 364 |
| Note: | Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum. |
| Institutes/Facilities: | Lehrstuhl für Photonik und Terahertztechnologie |
| Dewey Decimal Classification: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau |
| open_access (DINI-Set): | open_access |
| faculties: | Fakultät für Elektrotechnik und Informationstechnik |
| Licence (English): |  Creative Commons - CC BY 4.0 - Attribution 4.0 International |
