Applications of optical coherence tomography in the non-contact assessment of automotive paints

Samuel Lawman; Jinke Zhang; Bryan M. Williams; Yalin Zheng; Yao-Chun Shen

doi:10.1117/12.2270020

26 June 2017 Applications of optical coherence tomography in the non-contact assessment of automotive paints

Samuel Lawman, Jinke Zhang, Bryan M. Williams, Yalin Zheng, Yao-Chun Shen

Proceedings Volume 10329, Optical Measurement Systems for Industrial Inspection X; 103290J (2017) https://doi.org/10.1117/12.2270020
Event: SPIE Optical Metrology, 2017, Munich, Germany

Abstract

The multiple layer paint systems on modern cars serve two end purposes, they firstly protect against corrosion and secondly give the desired visual appearance. To ensure consistent corrosion protection and appearance, suitable Quality Assurance (QA) measures on the final product are required. Various (layer thickness and consistency, layer composition, flake statistics, surface profile and layer dryness) parameters are of importance, each with specific techniques that can measure one or some of them but no technique that can measure all or most of them. Optical Coherence Tomography (OCT) is a 3D imaging technique with micrometre resolution. Since 2016, OCT measurements of layer thickness and consistency, layer composition fingerprint and flake statistics have been reported. In this paper we demonstrate two more novel applications of OCT to automotive paints. Firstly, we use OCT to quantify unwanted surface texture, which leads to an “orange peel” visual defect. This was done by measuring the surface profiles of automotive paints, with an unoptimised precision of 37 nm over lateral range of 7 mm, to quantify texture of less than 500 nm. Secondly, we demonstrate that OCT can measure how dry a coating layer is by measuring how fast it is still shrinking quasiinstantaneously, using Fourier phase sensitivity.

Citation Download Citation

Samuel Lawman, Jinke Zhang, Bryan M. Williams, Yalin Zheng, and Yao-Chun Shen "Applications of optical coherence tomography in the non-contact assessment of automotive paints", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103290J (26 June 2017); https://doi.org/10.1117/12.2270020

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available