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The objective of this study is to evaluate active infrared thermography as a potential tool for non-emergent cracks detection in building materials. The methodology used was to simulate the presence of cracks hidden behind a layer of plaster by using mosaics with joints of variable thicknesses. The feasibility of the method was presented in a preceding conference [1]. Infrared thermography measurements were performed in square pulse heating mode. Numerical simulations were performed using FLUENTTM to favour the study of a large number of configurations. However, numerical simulation results are compared with experimental results for some configurations: four joints thicknesses and two different materials configurations. This second step was used to study the influence of parameters that may affect detection efficiency of cracks such as materials thermophysical properties, crack size and depth... Another objective of the study was to analyse thermographic sequences using different methods, such as for instance contrast method [2] or singular-value decomposition [3] and to compare performances of these methods in some particular experimental test cases.

Detection of hidden defects of small extension by infrared IR thermography: application to cracks detection