Quantitative infrared thermography in buildings

Up to now, infrared thermographic approaches have been considered either passive or active. In the latter case, the heat flux is historically attributed to a non-natural heat source. The use of the sun has recently been incorporated into the active approach thanks to multi-temporal inspections. In this paper, an innovative hybrid thermographic (HIRT) approach is illustrated. It combines both the time component and the solar source to obtain quantitative information such as the defect depth. Thermograms were obtained by inspecting the facade of the Santa Maria Collemaggio church (L'Aquila, Italy), whereas quantitative results related to the sub-superficial discontinuities were obtained thanks to the use of advanced techniques. Experimental results linked to passive approach (i.e., the mosaicking procedure of the thermograms) performed by selecting a set of historic churches are also included in order to explain, when and where, the hybrid procedure should be used. RESUMEN: Exploración infrarroja del patrimonio arquitectónico: de la termografía infrarroja pasiva al enfoque de la termografía infrarroja híbrida (HIRT).Hasta la fecha, los enfoques sobre la termografía infrarroja han sido considerados, o pasivos, o activos. En este último caso, el flujo de calor se obtiene a través de una fuente de calor no natural. El uso de energía solar ha sido recientemente incorporado al enfoque activo gracias a los estudios multitemporales. En este trabajo, se ilustra un enfoque innovador de la termografía híbrida (HIRT). Se combina tanto el componente de tiempo y la fuente de energía solar para recuperar la información cuantitativa así como la profundidad del defecto. Las imágenes térmicas se obtuvieron mediante el análisis de la fachada de la Iglesia de Santa María Collemaggio (L'Aquila, Italia), mientras que los resultados cuantitativos inherentes a las discontinuidades sub-superficiales se obtuvieron gracias al uso de otras técnicas avanzadas. Los resultados experimentales vinculados al enfoque pasivo (es decir, el proceso de mosaico de las imágenes térmicas) derivan de un conjunto de Iglesias antiguas, también incluidas en el estudio, a fin de explicar cuándo y dónde tiene sentido realizar un proceso híbrido.

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“…By considering a corrective factor k c , the z depth of the defect [m] can be retrieved through Eq. [3]:…”

Section: Hybrid Irt Approachmentioning

confidence: 99%

“…Recently, the use of thermographic quantitative procedures for the inspection of buildings has been generally applied to study thermal properties, such as the transmittance parameter (1)(2)(3)(4)(5).…”

Section: Introductionmentioning

confidence: 99%

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Сфарра¹,

Marcucci²,

Ambrosini³

et al. 2016

Mater. construcc.

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“…Quantitative infrared thermography can be undertaken in constructions following different artificial sources such as air flux or radiant flux (Grinzato et al, 1998). However, qualitative approaches are most widespread given the simplicity of acquiring imagery, and the chance to interpret these after visual inspections (Lerma et al, 2007).…”

Section: Thermography For Architectural Cultural Heritage Applicationsmentioning

confidence: 99%

Multidisciplinary Studies, Crossreading and Transversal Use of Thermography: The Castle of Monzón (Huesca) as a case study

Mileto

López-Manzanares

Lerma

2015

MODERN AGE FORTIFICATIONS of the MEDITERRANEAN COAST - DEFENSIVE ARCHITECTURE OF THE MEDITERRANEAN (FORTMED2015)

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The study carried out at the castle of Monzón (Huesca) while developing the Master Plan for the preservation of the site clearly aims at efficient interaction between different studies by several groups of experts in various disciplines. The various studies were coordinated jointly in order to offer a comprehensive analysis of the monument, intertwining approaches and points of views. Among the techniques used, thermography was especially interesting because of its flexibility and adaptability in several applications: from helping to identify materials to the detection of hidden pathologies. The efficiency of thermography for emphasizing different phenomena can only be improved by combining with other survey and analysis techniques. Synoptic plans allow these techniques to enrich the information available, reaching greater accuracy in determining materials and pathologies.

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“…In this area more or less complicated methods have been developed, for example with the use of surface heaters [16], a thermal impulse with constant intensity [17], hot air [18], or heating lamps [19].…”

Section: Introductionmentioning

confidence: 99%

Transient Infrared Measurement of Laser Absorption Properties of Porous Materials

Marynowicz¹

2016

Measurement Science Review

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The infrared thermography measurements of porous building materials have become more frequent in recent years. Many accompanying techniques for the thermal field generation have been developed, including one based on laser radiation. This work presents a simple optimization technique for estimation of the laser beam absorption for selected porous building materials, namely clinker brick and cement mortar. The transient temperature measurements were performed with the use of infrared camera during laser-induced heating-up of the samples' surfaces. As the results, the absorbed fractions of the incident laser beam together with its shape parameter are reported.

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Quantitative infrared thermography in buildings

Cited by 189 publications

References 2 publications

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Multidisciplinary Studies, Crossreading and Transversal Use of Thermography: The Castle of Monzón (Huesca) as a case study

Transient Infrared Measurement of Laser Absorption Properties of Porous Materials

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