Articles | Volume 11, issue 2
https://doi.org/10.5194/wes-11-693-2026
https://doi.org/10.5194/wes-11-693-2026
Research article
 | 
24 Feb 2026
Research article |  | 24 Feb 2026

Non-destructive sub-surface inspection of multi-layer wind turbine blade coatings by mid-infrared optical coherence tomography

Coraline Lapre, Christian Rosenberg Petersen, Per Nielsen, Thomas Wulf, Jakob Ilsted Bech, Søren Fæster, Ole Bang, and Niels Møller Israelsen

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Ardebili, A. and Alaei, M. H.: Non-destructive testing of delamination defects in GFRP patches using step heating thermography, NDT & E International, 128, 102617, https://doi.org/10.1016/j.ndteint.2022.102617, 2022. a
Asokkumar, A., Jasiūnienė, E., Raišutis, R., and Kažys, R. J.: Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites, Materials, 14, 1058, https://doi.org/10.3390/ma14051058, 2021. a
Bashkansky, M. and Reintjes, J.: Statistics and reduction of speckle in optical coherence tomography, Optics Lett., 25, 545, https://doi.org/10.1364/ol.25.000545, 2000. a
Beauson, J., Laurent, A., Rudolph, D., and Pagh Jensen, J.: The complex end-of-life of wind turbine blades: A review of the European context, Renewable and Sustainable Energy Reviews, 155, 111847, https://doi.org/10.1016/j.rser.2021.111847, 2022. a
Boscato, G., Civera, M., and Zanotti Fragonara, L.: Recursive partitioning and Gaussian Process Regression for the detection and localization of damages in pultruded Glass Fiber Reinforced Polymer material, Structural Control and Health Monitoring, 28, https://doi.org/10.1002/stc.2805, 2021. a
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We present an optical volumetric scanner used to characterise the coating on wind turbine blades. Two samples were characterised: the first sample was used to define the maximum depth measurement, and the second imitated the usual manufacturing defect inside the coating. We also developed an algorithm to monitor the thickness of multiple coating layers, which is based on the scattering and absorption properties of the material.

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