Improvement of building wall surface temperature measurements by infrared thermography |
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Institution: | 1. Department of Industrial and Information Engineering and Economics (DIIIE), University of L''Aquila, Piazzale E. Pontieri no. 1, Monteluco di Roio - L''Aquila (AQ), I-67100, Italy;2. Department of Information Engineering, Computer Science and Mathematics (DISIM), University of L''Aquila, Via Vetoio, L''Aquila (AQ), I-67100, Italy;3. Istituto Nazionale di Alta Matematica, I-00185, Rome, Italy;4. Gran Sasso Science Institute, L''Aquila (AQ), I-67100, Italy;5. Computer Vision and Systems Laboratory, Department of Electrical and Computer Engineering, Université Laval, 1065, av. de la Médecine, Quebec City, Quebec G1V 0A6, Canada |
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Abstract: | By using quantitative thermal scanning of building surface structures, it is possible to access the temperature field. For further calculation of the heat flux exchanged by these structures with the environment, one must quantify as finely as possible the temperature field on the bodies surfaces. For this purpose we have to take into account that real bodies are not black, which implies that a part of the ambient radiation received by the infrared camera detectors is reflected radiation. In this paper, we present a method to quantify the reflected flux by using an infrared mirror, which allows large surface temperature measurements by infrared thermography under near-ambient conditions with improved accuracy. In order to validate the method, an experimental study was carried out on a multi-layer wall, which simulated an insulation default. A good agreement was noticed between the thermocouple temperatures and the infrared corrected ones. Then, the method is applied to outdoor measurements. |
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