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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Principal Component Thermography for Defect Detection in Concrete.

Bojan Milovanović¹, Mergim Gaši¹, Sanjin Gumbarević¹

¹Faculty of Civil Engineering, Department of Materials, Fra Andrije Kačića Miošića 26, University of Zagreb, 10000 Zagreb, Croatia.

Sensors (Basel, Switzerland)

|July 17, 2020

Summary

Principal Component Thermography (PCT) enhances defect detection in concrete structures using infrared thermography (IRT). This method improves non-destructive testing accuracy, especially in shaded conditions.

Keywords:

concrete defect detection infrared thermography non-destructive testing principal component analysis

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Area of Science:

Materials Science
Civil Engineering
Non-Destructive Testing

Background:

Condition assessment of concrete structures is crucial for durability and usability.
Infrared thermography (IRT) faces challenges in defect detection due to environmental factors and material properties.
Defects in concrete can significantly reduce structural integrity.

Purpose of the Study:

To evaluate Principal Component Thermography (PCT) as a post-processing technique for enhancing defect detection in concrete.
To improve the accuracy of non-destructive testing (NDT) for concrete structures using IRT.
To investigate the influence of concrete type, thermal excitation, and defect geometry on detectability.

Main Methods:

Application of Principal Component Analysis (PCA) to sequences of thermograms.
Analysis of empirical orthogonal functions (EOFs) for defect identification.
Experimental testing of concrete samples with known defects using step heating thermography.

Main Results:

PCT effectively enhances the detectability of defects in concrete structures.
The study demonstrated PCT's capability to improve defect detection even in challenging conditions, such as shaded areas.
Results indicate that defect detectability is influenced by concrete properties, excitation methods, and defect characteristics.

Conclusions:

Principal Component Thermography (PCT) is a valuable post-processing tool for improving infrared thermography (IRT) in concrete structure assessments.
PCT offers a significant potential to increase the accuracy of non-destructive testing (NDT) for concrete elements.
Further research can optimize PCT application based on material and defect parameters.