Publication
Title
Determining directional emissivity : numerical estimation and experimental validation by using infrared thermography
Author
Abstract
Little research has examined that inaccurate estimations of directional emissivity form a major challenge during both passive and active thermographic measurements. Especially with the increasing use of complex curved shapes and the growing precision of thermal cameras, these errors limit the accuracy of the thermal measurements. In this work we developed a technique to estimate the directional emissivity using updated numerical simulations. The reradiation on concave surfaces is examined by thermal imaging of a homogeneous heated curved metal and nylon test sample. We used finite element modelling to predict the reradiation of concave structures in order to calculate the parameters of an approximating formula for the emissivity dependent on the angle to the normal vector on each element. The differences between experimental and numerical results of the steel test sample are explained using electron microscopy imaging and the validation on different materials. The results suggest that it is possible to determine the errors of thermal imaging testing of complex shapes using a numerical model.
Language
English
Source (journal)
Infrared physics and technology. - Oxford
Publication
Oxford : 2016
ISSN
1350-4495
Volume/pages
77(2016), p. 344-350
ISI
000381532900044
Full text (Publishers DOI)
Full text (open access)
The author-created version that incorporates referee comments and is the accepted for publication version Available from 08.06.2018
Full text (publishers version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 27.06.2016
Last edited 22.04.2017
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