Journal article
Non-destructive subsurface inspection of marine and protective coatings using near- and mid-infrared optical coherence tomography
Department of Photonics Engineering, Technical University of Denmark1
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark2
The Hempel Foundation Coatings Science and Technology Centre (CoaST), Department of Chemical and Biochemical Engineering, Technical University of Denmark3
Department of Chemical and Biochemical Engineering, Technical University of Denmark4
Optical Sensor Technology, Department of Photonics Engineering, Technical University of Denmark5
Near- and mid-infrared optical coherence tomography (OCT) is evaluated as a non-destructive and non-contact reflection imaging modality for inspection of industrial and marine coatings. Near-infrared OCT was used to obtain high-resolution images (~6/2 µm lateral/axial) of hidden subsurface cracks and defects in a resin base coating, which had been exposed to high pressure and high temperature to study coating degradation in hostile environments.
Mid-infrared OCT was employed for high-resolution (~15/8.5 µm lateral/axial) subsurface inspection of highly scattering marine coatings, demonstrating monitoring of wet film thickness and particle dispersion during curing of a 210 µm layer of antifouling coating, and detection of substrate corrosion through 369 µm of high-gloss alkyd enamel.
Combining high-resolution and fast, non-invasive scanning, OCT is therefore considered a promising tool for studying coating performance and for industrial inspection.
| Language: | English |
|---|---|
| Publisher: | MDPI AG |
| Year: | 2021 |
| Pages: | 877 |
| ISSN: | 20796412 |
| Types: | Journal article |
| DOI: | 10.3390/coatings11080877 |
| ORCIDs: | Rajagopalan, Narayanan , Markos, Christos , Woyessa, Getinet , Tidemand‐Lichtenberg, Peter , Bang, Ole , Petersen, Christian R. , Israelsen, Niels M. , Rodrigo, Peter J. , Pedersen, Christian , Weinell, Claus E. and Kiil, Søren |
