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22 April 2009 Characterization of thermal imagers under various ambient conditions
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Thermal imagers are often used under ambient conditions, which differ significantly from the calibration conditions. In this paper a method for characterization of thermal imagers under various ambient conditions is described in the ambient temperature range from -10 °C to +23 °C. A flat-plate blackbody source attached to a climatic chamber has been used to simulate the measurement conditions corresponding to the use of the imagers in thermography of buildings. The lower temperature limit has been selected based on typical field measurement conditions in the Nordic regions while the upper limit is a typical laboratory temperature during the calibration of the instruments. Correction factors of more than 1 K relative to the calibration at the laboratory conditions have been observed at lower temperatures with a high-quality imager under test. Analysis of the measurement results with corresponding uncertainty estimation is described. The expanded uncertainty (k = 2) of the correction factor has been estimated to be 0.4 K.
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Riho Vendt, Priit Jaanson, Viktor Vabson, Martin Vilbaste, Toomas Kübarsepp, and Mart Noorma "Characterization of thermal imagers under various ambient conditions", Proc. SPIE 7299, Thermosense XXXI, 729902 (22 April 2009);

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