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Author(s): Edis, E., Flores-Colen, I. and Brito, J.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 842-849
Total Pages: 8
Language: English

Abstract: In passive thermography, where natural boundary conditions are used to trigger surface temperature variations, thermographic data is usually analysed qualitatively, and thus accuracy issues may arise, and defects cannot be characterised exactly. On the contrary, in active thermography applications where artificial heat sources are used, quantitative analysis methods are performed and defects can be accurately characterised. However, in building thermography, especially in the case of exterior inspections of middle to high-rise buildings, passive thermography is generally preferred.

In current thermography literature, attempts to use quantitative methods in passive thermography have been made to enhance thermograms and/or increase the results accuracy. Time-dependent data are analysed for this purpose. In this respect, a ceramic building facade with pre-identified delamination problems was inspected by passive thermography, and timedependent thermal behaviour of the defective areas was analysed by simple image subtraction, principal component analysis and non-negative matrix factorization, as different quantitative methods, for evaluating the potential of time-dependent analysis and comparing different analysis approaches.

In the paper, following an introduction, brief information on quantitative approaches used in the analyses is given as a theoretical background. Information on the aforementioned inspection and results obtained by different quantitative approaches are explained afterwards. Finally, the potential of these approaches in detecting the delamination problem is discussed and compared.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00

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