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Advisor(s)
Abstract(s)
A crescente utilização da termografia de infravermelhos na construção civil está
intrinsecamente relacionada com o facto de se tratar de um ensaio não destrutivo, permitindolhe
apresentar-se como uma ótima ferramenta de diagnóstico, utilizada na manutenção e na
reabilitação, possibilitando desenvolver estudos relacionados com o desempenho térmico dos
elementos construtivos, assim como identificar anomalias construtivas e áreas degradadas.
Neste trabalho abordam-se os princípios fundamentais da termografia de infravermelhos, os
seus procedimentos, as suas principais vantagens e desvantagens, bem como as suas
aplicações em diversas áreas, assim como os principais fatores que influenciam as medições
aquando da utilização desta técnica.
A elaboração desta dissertação incidiu essencialmente na realização de duas campanhas
experimentais, uma com o intuito de avaliar o processo de secagem e outra com o intuito de
efetuar uma análise de sensibilidade. A avaliação do processo de secagem consistiu na
utilização da câmara termográfica e do humidímetro, para monitorizar a evolução da secagem
de quatro fachadas de um edifício, recorrendo à captação de termogramas “dinâmicos” e ao
registo de leituras efetuadas com o humidímetro, ao longo de cinco períodos do dia, durante
seis dias. Os resultados termográficos foram comparados com os do humidímetro, permitindo
avaliar qualitativamente a evolução da secagem dos elementos construtivos. A análise de
sensibilidade consistiu na utilização de três equipamentos de medição de temperaturas
superficiais, sendo eles a câmara termográfica, o termómetro de infravermelhos e termopares
do tipo T, com o objetivo de comparar o valor de temperatura por eles obtidos quando sujeitos
a diferentes condições de ensaio.
ABSTRACT: The increasing use of infrared thermography in construction is intrinsically related to the fact that it is a non-destructive testing. Therefore, it can be used as a diagnostic tool, both for maintenance and rehabilitation, enabling studies related to the thermal behavior of construction elements as well as to identify anomalies and degraded areas of a building. In this research the fundamental principles of infrared thermography are discussed, including their procedures, their main advantages and disadvantages, as well as its applications in different areas. The main factors that can influence the measurements are also discussed. This dissertation focused on conducting two experimental campaigns, one to evaluate the drying process and the other to perform a sensitivity analysis. The evaluation of the drying process was based on the use of infrared thermography and a moisture meter, and monitoring the drying progress of four façades of a building. For that "dynamic" thermograms were captured and moisture measured over five periods of the day, for six days. Thermal imaging results were compared with those of the moisture meter, allowing a qualitatively assessment of the drying process. The sensitivity analysis was developed using three different devices to measure surface temperatures, namely the thermal camera, the infrared thermometer and type T thermocouples. The aim was to compare the surface temperature determined by each device when subjected to different conditions.
ABSTRACT: The increasing use of infrared thermography in construction is intrinsically related to the fact that it is a non-destructive testing. Therefore, it can be used as a diagnostic tool, both for maintenance and rehabilitation, enabling studies related to the thermal behavior of construction elements as well as to identify anomalies and degraded areas of a building. In this research the fundamental principles of infrared thermography are discussed, including their procedures, their main advantages and disadvantages, as well as its applications in different areas. The main factors that can influence the measurements are also discussed. This dissertation focused on conducting two experimental campaigns, one to evaluate the drying process and the other to perform a sensitivity analysis. The evaluation of the drying process was based on the use of infrared thermography and a moisture meter, and monitoring the drying progress of four façades of a building. For that "dynamic" thermograms were captured and moisture measured over five periods of the day, for six days. Thermal imaging results were compared with those of the moisture meter, allowing a qualitatively assessment of the drying process. The sensitivity analysis was developed using three different devices to measure surface temperatures, namely the thermal camera, the infrared thermometer and type T thermocouples. The aim was to compare the surface temperature determined by each device when subjected to different conditions.
Description
Keywords
Análise de sensibilidade Secagem Temperatura superficial Termografia de infravermelhos