Applicability analysis of IR thermography and discrete wavelet transform for technical conditions assessment of bridge elements

Różański, Leszek; Ziopaja, Krzysztof

doi:10.1080/17686733.2018.1480307

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…The emissivity of dry concrete is in the range of 0.92 to 0.98 depending on the surface condition and roughness. In these studies, the emissivity of concrete was adjusted to 0.95 as commonly reported in the research literature [19,31,37] and emissivity tables in technical reports and sensor users' manual [36]. In general, the emissivity measurement based on the standard procedures is challenging and not reliable due to the variations in the surrounding and detector temperature as discussed in detail by Chen and Chen [38].…”

Section: Methodsmentioning

confidence: 99%

“…The thickness of concrete cover or the depth of void underneath the surface was 5, 10, 15, 20 and 25 mm for models SQ100-D5 to SQ100-D25, respectively. In the experimental studies [3,11,29,31,32] on the effect of geometry and depth of subsurface defects using IRT, void-like and delamination-like defects are simulated by casting pieces of polystyrene and timber of different sizes and at various depths in the concrete. Polystyrene-made inclusions are widely used in the simulation of artificial delamination and voids because the concrete over them has shown similar temperature contrast patterns to actual defects [29,33].…”

Section: Concrete Modelsmentioning

confidence: 99%

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Experimental investigation of subsurface defect detection in concretes by infrared thermography and convection heat exchange

Pedram

Taylor

Robinson

et al. 2022

J Civil Struct Health Monit

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Infrared thermography (IRT) is a non-destructive technique capable of detection and localisation of hidden subsurface defects in components of transportation infrastructure, such as concrete bridges, thereby contributing to structural health monitoring (SHM). Addressing the lack of research on subsurface defect detection in concretes by convection heat exchange, and regarding the importance of laboratory studies for proper implementation of IRT, this paper presents results from recent laboratory investigations of IRT on concrete slabs with simulated hidden defects using a convective thermal excitation mechanism. The concrete slabs in this study had simulated defects ranging 5–25 mm in depth from the surface. These studies show the effect of initial temperature, heating/cooling process, temperature range and defect depth on thermal contrast in the concrete slabs. Furthermore, this paper compares the performance of the IRT as a non-contact sensor and thermocouples attached to the surface, in the evaluation of the thermal contrast on slabs with various defect depth. The dependence of maximum thermal contrast on the initial temperature and defect depth is explored using multivariate linear regression.

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Section: Methodsmentioning

confidence: 99%

Section: Concrete Modelsmentioning

confidence: 99%

Experimental investigation of subsurface defect detection in concretes by infrared thermography and convection heat exchange

Pedram

Taylor

Robinson

et al. 2022

J Civil Struct Health Monit

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“…As mentioned earlier, there are various sources of uncertainties associated with practical implementation of IRT for monitoring of the concrete bridges. An in-depth understanding of the heat flow mechanism around the defective concrete with defects at different depths from the surface using basic laboratory investigations is indispensable and invaluable for tackling these challenges and uncertainties [26][27][28]. This basic knowledge and understanding about the trend of thermal contrast variation, helps in reduction of the uncertainty in interpretation of the IRT results.…”

Section: Objectives and Scope Of This Researchmentioning

confidence: 99%

Experimental evaluation of heat transition mechanism in concrete with subsurface defects using infrared thermography

Pedram

Taylor

Hamill

et al. 2022

Construction and Building Materials

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“…Thermographic systems indirectly measure the temperature of the tested object and directly measure the power of infrared radiation emitted by this object [44][45][46][47][48][49][50][51][52]. This radiation is converted by the system's detection structure into an electric signal, which is a carrier of information about the object's temperature.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Thermal Stability and Surface Characteristics of Thermoplastic Polyurethane V-Belt

et al. 2020

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This article proposes thermography as a non-contact diagnostic tool for assessing drive reliability. The application of this technique during the operation of the belt transmission with a heat-welded thermoplastic polyurethane V-belt was presented. The V-belt temperature changes depending on the braking torque load at different values of the rotational speed of the active pulley, which were adopted as diagnostic characteristics. In this paper, the surface morphology of the polyurethane (PU) belts was assessed on the basis of microscopic and hardness tests. A surface roughness tester was used to evaluate the surface wear. The surface morphology and topography of the materials was determined by scanning electron microscopy (SEM) and optical microscopy. It was found that the most favorable operating conditions occurred when the temperature values of active and passive connectors were similar and the temperature difference between them was small. The mechanical and structure results indicate that the wear of the PU belt was slight, which provided stability and operational reliability for V-belt transmission. The microscopic images lacked clear traces of cracks and scratches on the surface, which was confirmed by the SEM observations.

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Applicability analysis of IR thermography and discrete wavelet transform for technical conditions assessment of bridge elements

Cited by 7 publications

References 9 publications

Experimental investigation of subsurface defect detection in concretes by infrared thermography and convection heat exchange

Experimental investigation of subsurface defect detection in concretes by infrared thermography and convection heat exchange

Experimental evaluation of heat transition mechanism in concrete with subsurface defects using infrared thermography

Evaluation of the Thermal Stability and Surface Characteristics of Thermoplastic Polyurethane V-Belt

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