Non-destructive subsurface inspection of marine and protective coatings using near- and mid-infrared optical coherence tomography

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Abstract

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.

Original languageEnglish
Article number877
JournalCoatings
Volume11
Issue number8
Number of pages14
ISSN2079-6412
DOIs
Publication statusPublished - 2021

Keywords

  • 3D imaging
  • Anticorrosion
  • Antifouling
  • Film thickness
  • Non-destructive testing
  • Non-invasive
  • OCT
  • Subsurface inspection
  • Supercontinuum
  • Underfilm

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