Quantitative analysis of plastered mosaics by means of active infrared thermography

Theodorakeas, Panagiotis; Avdelidis, Nicolas P.; Cheilakou, Eleni; Koui, Maria

doi:10.1016/j.conbuildmat.2014.09.089

Cited by 41 publications

(20 citation statements)

References 13 publications

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“…Usually, only one parameter is of interest (e.g., depth) which can be estimated by correlating the numerical and the experimental results. Quantitative characterisation by means of pulsed, and more generally speaking of active thermal imaging, includes mainly depth information retrieval [14][15][16][17][18] and the estimation of defect's lateral dimension [19][20][21], while several studies have also investigated the determination of the thermal properties either of the material being inspected [22,23] or of the hidden features [24].…”

Section: Introductionmentioning

confidence: 99%

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Theodorakeas

Koui

2018

Applied Sciences

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Featured Application: The present study intends to show the potentiality of pulsed thermographic imaging to quantitatively characterise hidden defects in Carbon Fibre Reinforced Polymers. By comparing the performance of different depth retrieval procedures, it was possible to evaluate the produced depth estimation accuracy and to define the impact of different experimental and analysis parameters in quantitative analysis. Abstract:In the present study, a Carbon Fibre Reinforced Polymer (CFRP) sample of trapezoid shape, consisting of internal artificial delaminations of various sizes and depth locations, is investigated by means of optical pulsed thermography for the retrieval of quantitative depth information. The main objectives of this work are to evaluate the produced depth estimation accuracy from two contrast-based depth inversion procedures as well as to correlate the acquired results with characteristics such as the location and size of the detected features and with analysis parameters such as the selection of the sound area. Quantitative analysis is performed in both the temporal and frequency domains, utilising, respectively, the informative parameters of thermal contrast peak slope time and blind frequency. The two depth retrieval procedures are applied for the depth estimation of features ranging in size from 3 mm to 15 mm and in depth from 0.2 mm to 1 mm. The results of the present study showed that the two different analyses provided efficient depth estimations, with frequency domain analysis presenting a greater accuracy. Nevertheless, predicting errors were observed in both cases and the factors responsible for these errors are defined and discussed.

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Section: Introductionmentioning

confidence: 99%

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Theodorakeas

Koui

2018

Applied Sciences

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“…For instance, Fox et al [9] studied on the time-lapse thermography, in other words taking various time-dependent thermograms of the object and evaluating the thermal response over time, through in situ inspections for the detection of building defects such as cracks. Theodorakeas et al [10] made a quantitative analysis of active IRT results through laboratory experiments and numerical simulations to detect plastered mosaics. Gonz alez-Aguilera et al [11] studied on the automatic three dimensional thermographic modelling of buildings to be used in energy efficiency studies.…”

Section: Introductionmentioning

confidence: 99%

Quasi-quantitative infrared thermographic detection of moisture variation in facades with adhered ceramic cladding using principal component analysis

Edis

Flores‐Colen

Brito

2015

Building and Environment

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“…As an integrated approach, modeling and IRT technique has been used in different times on samples or real case studies, as well as in many research fields [15][16][17][18][19][20][21][22][23][24][25]. Instead, in the ceramic art industry, these types of methodologies are, up to now and to the best of our knowledge, separately applied [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Ceramics and defects

Сфарра

Perilli

Paoletti

et al. 2015

J Therm Anal Calorim

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The feasibility of square-pulsed thermography nondestructive testing for the detection of defects in one ceramic material sample has been carried out by finite element (FE) analysis. In particular, a ceramic plate containing defects of different diameters, depths, locations, nature, and shapes has been numerically investigated by means of Comsol Ò Multiphysics computer program, taking into account the results coming from both a MATLAB TM script and the infrared thermography (IRT) technique. Indeed, the FE method simulates through a 3D model the heat transfer process induced into the ceramic material by two halogen lamps that have been applied in order to provoke an optimum thermal stress. Moreover, further defects like cracks arose beneath the surface of the plate due to the shrinkage process, have been discovered, and contrasted using a non-usual segmentation algorithm that when correlated in the time to IRT data simulates the thermo-elastic effect. Following the non-direct procedure proposed, both the depth of each defect and its main dimensions have been retrieved into a satisfactory accuracy.

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Quantitative analysis of plastered mosaics by means of active infrared thermography

Cited by 41 publications

References 13 publications

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Depth Retrieval Procedures in Pulsed Thermography: Remarks in Time and Frequency Domain Analyses

Quasi-quantitative infrared thermographic detection of moisture variation in facades with adhered ceramic cladding using principal component analysis

Ceramics and defects

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