Flash pulse phase thermography for a paint thickness determination

L Muzika,M Švantner

doi:10.1088/1757-899x/723/1/012021

L Muzika, M Švantner

Open Access

https://doi.org/10.1088/1757-899x/723/1/012021

Copy DOI

Abstract

The contribution describes a fast contactless measurement of a paint thickness non-uniformity using flash pulse thermography. Specimens sprayed by a paint were thermally excited by a flash lamp and temperature responses were recorded by an infrared camera. The recorded sequences were post-processed with Fast Fourier Transform to obtain phase angles. Differences in the resulting images showed phase differences which corresponded to a paint thickness non-uniformity. Furthermore, the phases were correlated with the thickness by means of calibration curve so that the paint thickness could be determined with flash pulse phase thermography measurement. The method showed a promising potential in the contactless evaluation of the paint thickness. Average error of the thickness determination was less than 10 % for samples with paint thickness from 41 to 74 µm on AISI 304 substrate. Advantages, disadvantages and limitations of described method were discussed.

Highlights

Paint thickness is one of the key parameter when dealing with paints
The phases were correlated with the thickness by means of calibration curve so that the paint thickness could be determined with flash pulse phase thermography measurement
5 Conclusion Flash pulse phase thermography measurement was used for the paint thickness estimation on AISI 304 substrate

Summary

Introduction

Paint thickness is one of the key parameter when dealing with paints. The thickness can influence both decorative and functional properties. Some more advanced and more expensive techniques can be used as betabackscatter measuring method [2] and X-Ray fluorescence [2]. They measure thickness and provide some additional information. With magnetic induction method the thickness can be determined just for non-magnetizable paint on magnetizable substrate. Because of that a technique which would provide readings from the whole surface could speed up the thickness measurement. In this contribution we introduce technique for a planar thickness determination based on flash pulse phase thermography [3].

50 Not specified 60 100 60

Results

Conclusion