Active IR-applications in civil engineering

Wiggenhauser, Herbert

doi:10.1016/s1350-4495(02)00145-7

Cited by 76 publications

(37 citation statements)

References 2 publications

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“…However, owing to the developments in nondestructive or slightly destructive test techniques in the recent years, it is possible to carry out diagnostic studies and surveys in a relatively short time. Among these techniques, infrared thermography (IRT) (Grinzato et al, 1998;2002;Balaras and Argirou, 2002;Avdelidis and Moropoulou, 2004;Barreira and Freitas, 2007) impulse or ground penetration radar (Moropoulou et al, 2002), microwave (Binda et al, 1998;Ka¨a¨ria¨nen et al, 2001) and ultrasonic velocity (UV) measurements (Grinzato et al, 2004), and measurements of electrical conductivity, particularly in wood (Quarles, 2008) are those mostly employed in building and site investigations (Wirahadikusumah et al, 1998;Wiggenhauser, 2002;Clark et al, 2003;Meola et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…In case of dampness, cooler areas where evaporation (an endothermic reaction cooling the surface) occurs, represent the moistened parts of the surface (Grinzato et al, 1998;2002;Balaras and Argirou, 2002;Avdelidis and Moropoulou, 2004;Barreira and Freitas, 2007). However, in addition to the material properties, the existence of excessive relative humidity and/or carbon dioxide in the ambient air also affects the results of thermographic measurements .…”

Section: Dampness In Historic Housementioning

confidence: 99%

“…Each range is expressed by the tones of purple. As the application of IRT technique requires (Grinzato et al, 1998;2002;Balaras and Argirou, 2002;Avdelidis and Moropoulou, 2004;Barreira and Freitas, 2007), the thermal map of each longitudinal wall was obtained by the evaluation of several IR panoramic shots along and perpendicular to the wall surface due to the narrow widths of the Spaces 1 and 2. Therefore, the distorted IRT perspective-images presented together with the normal photographs here are not accurate but mere rough images of the walls taken at the beginning of the detailed scanning of each wall.…”

Section: Measurements Of Moisture Content and Temperature Of The Wallmentioning

confidence: 99%

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Dampness Problems in a Historic House in İzmir, Turkey

Yardım

Tunçoku

2008

International Journal of Architectural Heritage

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The study, as a preliminary stage of the restoration work of a historic house from Levantine ages of _ Izmir in the nineteenth century, involves the examination of the dampness basement problems. Moisture contents and temperature of the wall surfaces were monitored by nondestructive techniques, such as direct measurements of electrical conductivity and infrared thermography. The results were evaluated in the light of physical properties, moisture, and soluble salt types and contents in the materials, outdoor, and indoor climatic conditions, layout of the site, and architectural features of the building. In addition to rising damp and lack of sufficient ventilation for years, some faulty details along the intersections with the terraces of the neighbor buildings, and intersection with the asphalt coated street and the basement windows that gave way for rainwater leaks were the other sources of dampness. Some cool but relatively dry parts of the walls were found to be potential zones for dampness problem through condensation between midnight and early mornings, especially in winter.

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Section: Methodsmentioning

confidence: 99%

Section: Dampness In Historic Housementioning

confidence: 99%

Section: Measurements Of Moisture Content and Temperature Of The Wallmentioning

confidence: 99%

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Dampness Problems in a Historic House in İzmir, Turkey

Yardım

Tunçoku

2008

International Journal of Architectural Heritage

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“…The authors utilised a NIR (Near Infrared) Camera (Jade Camera Cedip, sensitive in the peak of maximum absorption of liquid water at 1.934 μm) to map precisely the liquid water stains on the surface [24]. The images (Fig.…”

Section: Optical Testmentioning

confidence: 99%

Evaluation and monitoring of water diffusion into stone porous materials by means of innovative IR thermography techniques

Ludwig

Rosina

Sansonetti³

2018

Measurement

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A B S T R A C TThis paper shows the application of two innovative infrared thermography (IRT) methods for the evaluation of water transport phenomena through the outer layers of porous stone materials. An infrared camera measured: (a) the moisture stain due to the water absorption after having spilled a drop on the stone surface and (b) the "moisture ring" around the damp surface, after the contact between a soaked round sponge and the stone surface. The time of spreading and the geometric shape of the damped area depend on the porosity of the stone material and are useful to characterize the physical stone features. In addition, monitoring the evolution of the moisture ring by IRT allows implementing and optimize the data coming from protocols of water repellent products with data coming from the "contact sponge measures". Moreover, moisture ring test links IRT and laboratory tests characterizing the transport phenomena of liquid and water vapour in porous building materials. Thirty specimens of marble, calcarenite and sandstone were tested with steady methods (dry index and water absorption by capillarity), that validated the data provided by the two innovative IRT techniques.

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“…Defect parameters include the depth of occurrence, geometrical dimensions, i.e. lateral size and thickness plus thermal properties compared to those of the material inspected (Wiggenhauser, 2002;Ibarra-Castanedo et al, 2009;Bagavathiappan et al, 2013;Milovanovic and Banjad Pecur, 2016). This paper focuses primarily on determination of the defect lateral size and its accuracy, considered for experimental data processed with the proposed processing path.…”

Section: Introductionmentioning

confidence: 99%

Determining the dimension of subsurface defects by active infrared thermography – experimental research

Gryś

2018

J. Sens. Sens. Syst.

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Abstract. This paper presents research into a method of processing thermal images aimed at detecting and characterizing material defects, or non-uniformities, of the internal structure of materials. Active thermography was chosen as the NDT method. Hidden defects were revealed by analysing the temperature field of the tested material's front surface which was externally excited with heating lamps. Background removal and image segmentation were applied to the last thermogram in the sequence recorded at the end of the heating phase. The paper focuses on the quality of determining lateral dimensions of subsurface flaws in a polymethylmethacrylate slab with bottom holes drilled to imitate flaws. The following accuracy-affecting factors were taken into account: defect depth, emissivity of the inspected surface as an input, user-set parameter for the IR camera, type of filtering used to eliminate the effect of non-uniformity when heating the object surface with an external source, and global and local thresholding as a segmentation method used for defect detection and sizing.

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Active IR-applications in civil engineering

Cited by 76 publications

References 2 publications

Dampness Problems in a Historic House in İzmir, Turkey

Dampness Problems in a Historic House in İzmir, Turkey

Evaluation and monitoring of water diffusion into stone porous materials by means of innovative IR thermography techniques

Determining the dimension of subsurface defects by active infrared thermography – experimental research

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