The methodology for defect quantification in concrete using IR thermography

Milovanović, Bojan; Pečur, Ivana Banjad; Štirmer, Nina

doi:10.3846/13923730.2016.1210220

Cited by 15 publications

(14 citation statements)

References 16 publications

(21 reference statements)

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“…For example, simple image subtraction (SIS), also known as the computation of image differences, subtracts temperatures between two IR images at the same pixel location [111]. Principal component thermography (PCT), advanced processing based on principal component analysis (PCA) to summarize high-dimensional data [22], transforms a temperature 3D matrix in a combination of space and time into a 2D matrix by singular value decomposition to extract features and reduce noise [112,113]. Pulsed phase thermography (PPT), a method based on active IRT with one-dimension discrete Fourier transform, converts time-domain temperature data into frequency-domain data [112].…”

Section: Time-series Data Analysismentioning

confidence: 99%

“…Principal component thermography (PCT), advanced processing based on principal component analysis (PCA) to summarize high-dimensional data [22], transforms a temperature 3D matrix in a combination of space and time into a 2D matrix by singular value decomposition to extract features and reduce noise [112,113]. Pulsed phase thermography (PPT), a method based on active IRT with one-dimension discrete Fourier transform, converts time-domain temperature data into frequency-domain data [112]. PPT has the advantage of suppressing the effects of spatially nonuniform heating and emissivity distribution [114].…”

Section: Time-series Data Analysismentioning

confidence: 99%

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A Review of Infrared Thermography for Delamination Detection on Infrastructures and Buildings

Tomita

Chew

2022

Sensors

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This paper provides a comprehensive review on the use of infrared thermography to detect delamination on infrastructures and buildings. Approximately 200 pieces of relevant literature were evaluated, and their findings were summarized. The factors affecting the accuracy and detectability of infrared thermography were consolidated and discussed. Necessary measures to effectively capture latent defects at the early stage of delamination before crack formation were investigated. The results of this study could be used as the benchmarks for setting standardized testing criteria as well as for comparison of results for future works on the use of infrared thermography for detection of delamination on infrastructures and buildings.

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Section: Time-series Data Analysismentioning

confidence: 99%

Section: Time-series Data Analysismentioning

confidence: 99%

A Review of Infrared Thermography for Delamination Detection on Infrastructures and Buildings

Tomita

Chew

2022

Sensors

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“…In civil engineering, thermography is used for the non-destructive diagnostics of building structures, most often for validation of quality and integrity of building envelopes [ 20 ], in energy audits of buildings [ 21 ] and diagnostics of building materials, including wood [ 13 , 22 , 23 , 24 , 25 , 26 ]. It should be noted that active thermography is successfully used in the diagnosis of isotropic materials.…”

Section: Introductionmentioning

confidence: 99%

Active Thermography in Diagnostics of Timber Elements Covered with Polychrome

Kucharska

Jaskowska-Lemańska

2021

Materials

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The contribution of natural wood defects such as knots is an important factor influencing the strength characteristics of structural timber. This paper discusses the use of active thermography in the timber diagnostics, particularly in the determination of the knot area ratio (KAR) in elements covered with paint coatings. Moreover, on the basis of thermal images, the localization for the subsequent semi-destructive tests (SDTs) was established. Three different sources of external energy supply were used in the studies: laboratory dryer, air heater and halogen lamps. The active thermography tests were performed on elements made of three wood species (fir, pine and spruce). The specimens were covered with varying layers of paint coatings and primers, to reflect the actual condition of the historic structural elements. The obtained thermal images enabled the estimation of the KAR, due to the difference in temperature between solid wood and knots occurring therein. It should be noted that the results were affected by an external energy source and subjective judgement of the operator. Moreover, active thermography could be an effective method for the indication of the regions within which SDTs should be performed in order to properly assess the technical state of an element covered with polychrome.

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“…Defect quantification (determination of their size, thickness and embedment depth) in concrete structures using IRT was performed by only a few research groups [ 10 , 17 , 18 , 19 , 20 ]. From the literature review, it can be said that researchers are using impulse-thermography (IT), pulse phase thermography (PPT) and lock-in thermography (LT) in their efforts to detect defects in concrete structures and/or concrete samples.…”

Section: Introductionmentioning

confidence: 99%

Principal Component Thermography for Defect Detection in Concrete

Milovanović

Gaši

Gumbarević

2020

Sensors

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The goal of the condition assessment of concrete structures is to gain an insight into current condition of concrete and the existence of defects, which decrease durability and usability of the structure. Defects are quite difficult to detect using infrared thermography when concrete elements cannot be thermally excited with the Sun, together with unfavorable thermophysical properties of concrete structures. In this paper, principal component thermography (PCT) is applied as a post-processing method to a sequence of thermograms in order to enhance defect detectability in concrete structures. Defects are detected by analyzing a set of empirical orthogonal functions (EOFs), which were acquired by applying principal component analysis to a sequence of thermograms. The research was performed using concrete samples containing known defects, which were tested using a step heating thermography setup. The results of presented research show that PCT is an effective post-processing method to improve defect detection in concrete structures. By effectively improving the defect detection, PCT has a potential to improve the non-destructive testing (NDT) accuracy of using infrared thermography (IRT) on concrete structures, especially in shaded areas of such structures. The research also shows the defect detectability depending on concrete type thermal excitation setup and defect geometry.

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The methodology for defect quantification in concrete using IR thermography

Cited by 15 publications

References 16 publications

A Review of Infrared Thermography for Delamination Detection on Infrastructures and Buildings

A Review of Infrared Thermography for Delamination Detection on Infrastructures and Buildings

Active Thermography in Diagnostics of Timber Elements Covered with Polychrome

Principal Component Thermography for Defect Detection in Concrete

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