Nondestructive thickness measurement system for multiple layers of paint based on femtosecond fiber laser technologies

Sudo, Masaaki; Takayanagi, Jun; Ohtake, Hideyuki

doi:10.1007/s10762-016-0303-8

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Recently, non-contact terahertz pulsed imaging (TPI) has been applied to automotive coating measurements [8][9][10]. TPI focuses a terahertz pulse onto a sample, then collects and characterises the reflected and backscattered pulse [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…By measuring the time delay between terahertz pulses reflected on the sample surface and its inner structure, the layer thickness can be determined. It has been demonstrated as a tool for measuring the thickness of individual paint layers and mapping the thickness distribution of multi-layered automotive paint samples [8][9][10]. However, the lateral resolution of TPI is limited by its wavelength to no lower than 150 -250µm [13].…”

Section: Introductionmentioning

confidence: 99%

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Non-destructive analysis of flake properties in automotive paints with full-field optical coherence tomography and 3D segmentation

Zhang¹,

Williams²,

Lawman³

et al. 2017

Opt. Express

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Automotive coating systems are designed to protect vehicle bodies from corrosion and enhance their aesthetic value. The number, size and orientation of small metallic flakes in the base coat of the paint has a significant effect on the appearance of automotive bodies. It is important for quality assurance (QA) to be able to measure the properties of these small flakes, which are approximately 10μm in radius, yet current QA techniques are limited to measuring layer thickness. We design and develop a time-domain (TD) full-field (FF) optical coherence tomography (OCT) system to scan automotive panels volumetrically, non-destructively and without contact. We develop and integrate a segmentation method to automatically distinguish flakes and allow measurement of their properties. We test our integrated system on nine sections of five panels and demonstrate that this integrated approach can characterise small flakes in automotive coating systems in 3D, calculating the number, size and orientation accurately and consistently. This has the potential to significantly impact QA testing in the automotive industry.

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