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Appl. Sci. 2017, 7(4), 351; doi:10.3390/app7040351

Scan-Less Line Field Optical Coherence Tomography, with Automatic Image Segmentation, as a Measurement Tool for Automotive Coatings

1
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK
2
Department of Eye and Vision Science, University of Liverpool, Liverpool L7 8TX, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Pircher
Received: 3 February 2017 / Revised: 28 March 2017 / Accepted: 29 March 2017 / Published: 1 April 2017
(This article belongs to the Special Issue Development and Application of Optical Coherence Tomography (OCT))
View Full-Text   |   Download PDF [2240 KB, uploaded 1 April 2017]   |  

Abstract

The measurement of the thicknesses of layers is important for the quality assurance of industrial coating systems. Current measurement techniques only provide a limited amount of information. Here, we show that spectral domain Line Field (LF) Optical Coherence Tomography (OCT) is able to return to the user a cross sectional B-Scan image in a single shot with no mechanical moving parts. To reliably extract layer thicknesses from such images of automotive paint systems, we present an automatic graph search image segmentation algorithm. To show that the algorithm works independently of the OCT device, the measurements are repeated with a separate time domain Full Field (FF) OCT system. This gives matching mean thickness values within the standard deviations of the measured thicknesses across each B-Scan image. The combination of an LF-OCT with graph search segmentation is potentially a powerful technique for the quality assurance of non-opaque industrial coating layers. View Full-Text
Keywords: optical coherence tomography; coatings; spectral domain; time domain; quality assurance; line field; image segmentation; graph search optical coherence tomography; coatings; spectral domain; time domain; quality assurance; line field; image segmentation; graph search
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lawman, S.; Williams, B.M.; Zhang, J.; Shen, Y.-C.; Zheng, Y. Scan-Less Line Field Optical Coherence Tomography, with Automatic Image Segmentation, as a Measurement Tool for Automotive Coatings. Appl. Sci. 2017, 7, 351.

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