{"data":{"id":"10.4121/uuid:5e253d43-6859-448e-820b-5ae2eb470cc7","type":"dois","attributes":{"doi":"10.4121/uuid:5e253d43-6859-448e-820b-5ae2eb470cc7","prefix":"10.4121","suffix":"uuid:5e253d43-6859-448e-820b-5ae2eb470cc7","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Dingemans L. M. (Liesbeth)","familyName":"Dingemans L. M. (Liesbeth)","affiliation":[],"nameIdentifiers":[]},{"name":"Papadakis, V. M. (Vassilis)","nameType":"Personal","givenName":"V. M. (Vassilis)","familyName":"Papadakis","nameIdentifiers":[{"nameIdentifier":"0000-0003-3188-4577","nameIdentifierScheme":"https://orcid.org/"}],"affiliation":[]},{"name":"Liu, P. (Ping)","nameType":"Personal","givenName":"P. (Ping)","familyName":"Liu","nameIdentifiers":[{"nameIdentifier":"0000-0002-9975-3998","nameIdentifierScheme":"https://orcid.org/"}],"affiliation":[]},{"name":"Adam, A. J. L. (Aurèle)","nameType":"Personal","givenName":"A. J. L. (Aurèle)","familyName":"Adam","nameIdentifiers":[{"nameIdentifier":"0000-0002-6727-946X","nameIdentifierScheme":"https://orcid.org/"}],"affiliation":[]},{"name":"Groves, Roger","nameType":"Personal","givenName":"Roger","familyName":"Groves","nameIdentifiers":[{"nameIdentifier":"0000-0001-9169-9256","nameIdentifierScheme":"https://orcid.org/"}],"affiliation":[]}],"titles":[{"title":"Quantitative coating thickness determination"}],"publisher":"TU Delft","container":{},"publicationYear":2017,"subjects":[{"subject":"Materials Engineering","subjectScheme":"Australian and New Zealand Standard Research Classification (ANZSRC), 2008","classificationCode":"0912"},{"subject":"FOS: Materials engineering","schemeUri":"http://www.oecd.org/science/inno/38235147.pdf","subjectScheme":"Fields of Science and Technology (FOS)"},{"subject":"Hyperspectral imaging"}],"contributors":[{"name":"TU Delft, Faculty Of Aerospace Engineering, Non-Destructive Testing Laboratory","nameType":"Organizational","affiliation":[],"contributorType":"Other","nameIdentifiers":[]},{"name":"TU Delft, Faculty Of Applied Sciences, Department Of Imaging Physics","nameType":"Organizational","affiliation":[],"contributorType":"Other","nameIdentifiers":[]}],"dates":[{"date":"2017-12-04","dateType":"Issued"}],"language":"en","types":{"ris":"DATA","bibtex":"misc","citeproc":"dataset","schemaOrg":"Dataset","resourceType":"Dataset","resourceTypeGeneral":"Dataset"},"relatedIdentifiers":[{"relationType":"References","relatedIdentifier":"https://doi.org/10.1117/12.2184716","relatedIdentifierType":"URL"}],"relatedItems":[],"sizes":[],"formats":["media types: application/zip, text/plain"],"version":"1","rightsList":[{"rights":"4TU General Terms of Use","rightsUri":"https://doi.org/10.4121/resource:terms_of_use"}],"descriptions":[{"description":"The coating selected in this research was a film-forming low-gloss wood lacquer for outdoors (Transparant zijdeglanslak voor buiten, Wijzonol Bouwverven B.V.). This coating was selected because it is semi-transparent commonly used wood coating, making it a suitable coating to visualize with OCT and hyperspectral imaging. This spruce-colored coating is based on organic solvent with an alkyd binder and applied using a brush. The samples that were prepared are: 1) Coating in a very flat and reflective silicon wafer to be able to determine the refractive index of the coating. 2) Different thickness coatings applied to a thin cover glasses in order to be able to determine the K and S coefficients from the KM-model and the extinction coefficient from the LB model. In order to measure the coefficients, these cover glasses were placed on a black-and-white checkerboard, as described below. 3) One to four layers of the coating were applied to a Medium-Density Fibreboard (MDF) plate covered with acrylic gesso. This reflective non-absorbing background serves as a reference for assessing the performance of the models. The hysperspectral imaging setup used in this study consisted of an IMSPECTOR V10E (Specim©) spectral camera, operating in the 400-1000 nm range. The visible range was selected due to the main absorption characteristics of the studied coating layers which is within the range of 400-1000nm.Optical Coherence Tomography (OCT) is a suitable technique for imaging the interfaces in a semi-transparent material and is therefore a logical choice for measuring coating thickness. This technique is based on low-coherence interferometry to measure light reflections from refractive index interfaces. As shown in Fig. 5, a customized OCT system was built by using a superluminescent diode (FESL-1550-20-BTF, Frankfurt Laser Company) centered at 1550 nm with a full width at half maximum of 60 nm, resulting in a 20 µm spot size and an 11 µm theoretical axial resolution inside the coating layer (considering a refractive index of 1.5). Depth-scanning for OCT was realized by the means of an optical delay line (ODL-650,MC, OZ Optics, Ltd). Lateral scanning of a sample with an x-y translation stage (T-LS28M, Zaber Inc., Canada) allowed for a 28 mm scanning range in two directions. Obtained data were bandpass filtered and an envelope detector was used to recover the depth dependent signal.","descriptionType":"Abstract"}],"geoLocations":[],"fundingReferences":[],"xml":"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