Infrared Thermography of Steel Structure by FFT

Bagavac, Petra; Krstulović‐Opara, Lovre; Domazet, Željko

doi:10.1016/j.matpr.2019.03.127

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…For example, orthopedic and bone or joint trauma, hormonal imbalance, vascular diseases, burns healing and detection of ulcers are just some of the diverse ongoing and growing studied applications of thermography [4]. Furthermore, IRT is regularly used in civil engineering to assess the structural health and energy efficiency of buildings [5,6]. Furthermore, thermography is a popular method of evaluation of historic monuments constructed of stone, brick masonry, or reinforced cement concrete [7].…”

Section: Introductionmentioning

confidence: 99%

The Dangers of Analyzing Thermographic Radiometric Data as Images

et al. 2023

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Thermography is probably the most used method of measuring surface temperature by analyzing radiation in the infrared part of the spectrum which accuracy depends on factors such as emissivity and reflected radiation. Contrary to popular belief that thermographic images represent temperature maps, they are actually thermal radiation converted into an image, and if not properly calibrated, they show incorrect temperatures. The objective of this study is to analyze commonly used image processing techniques and their impact on radiometric data in thermography. In particular, the extent to which a thermograph can be considered as an image and how image processing affects radiometric data. Three analyzes are presented in the paper. The first one examines how image processing techniques, such as contrast and brightness, affect physical reality and its representation in thermographic imaging. The second analysis examines the effects of JPEG compression on radiometric data and how degradation of the data varies with the compression parameters. The third analysis aims to determine the optimal resolution increase required to minimize the effects of compression on the radiometric data. The output from an IR camera in CSV format was used for these analyses, and compared to images from the manufacturer’s software. The IR camera providing data in JPEG format was used, and the data included thermographic images, visible images, and a matrix of thermal radiation data. The study was verified with a reference blackbody radiation set at 60 °C. The results highlight the dangers of interpreting thermographic images as temperature maps without considering the underlying radiometric data which can be affected by image processing and compression. The paper concludes with the importance of accurate and precise thermographic analysis for reliable temperature measurement.

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Section: Introductionmentioning

confidence: 99%

The Dangers of Analyzing Thermographic Radiometric Data as Images

et al. 2023

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“…The detection by infrared thermography is classified into two approaches: active thermography and passive thermography. The development of active infrared thermography methods has been accompanied by the development of interpretation methods and adopted stimulation techniques (heating source or excitation) [9][10][11][12][13][14][15][16][17]. Active infrared thermography methods have been developed with different types of excitation (halogen lamps, CO 2 lasers, microwaves, etc.)…”

Section: Introductionmentioning

confidence: 99%

Detection of Concrete Cover of Reinforcements in Reinforced Concrete Wall by Microwave Thermography with Transmission Approach

et al. 2022

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Concrete cover has an important role in reinforced concrete (RC) structures because it protects reinforcement bars from the bad effects of weather, fire, and bad environmental conditions that cause the corrosion of the reinforcements. Although it is an essential parameter to be considered for structural health monitoring (SHM), its detection by infrared thermography, especially in the heating phase, has not been accessed yet. The detailed analysis and discussions of physical phenomena, known as diffraction and interference, affecting the thermograms during the detection of the steel bars by microwave thermography have given an essential key for resolving this issue. The present paper proposes an innovative methodology with microwave thermography for determining the concrete cover thickness of one-layer reinforcements (12 mm in diameter and regularly placed at 10 cm) in an RC wall (1 m × 1m × 6.5 cm). By using the transmission approach with five angles of microwave antenna direction (0°, 15°, 30°, 45°, and 60°) and the Snell–Descartes law and linear law, the proposed methodology leads us to deduce the approximate value of the concrete cover thickness (37.74 mm), which is close to the real value (38 mm), as well as the spacing of the steel bars and dielectric constant of the concrete. The detection of the concrete cover thickness is another new remarkable achievement of infrared thermography methods.

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Infrared thermographic investigation of the use of microcrystalline wax to preserve apples from thermal shocks

Morello

Capua

2020

Measurement

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Infrared Thermography of Steel Structure by FFT

Cited by 6 publications

References 4 publications

The Dangers of Analyzing Thermographic Radiometric Data as Images

The Dangers of Analyzing Thermographic Radiometric Data as Images

Detection of Concrete Cover of Reinforcements in Reinforced Concrete Wall by Microwave Thermography with Transmission Approach

Infrared thermographic investigation of the use of microcrystalline wax to preserve apples from thermal shocks

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