Determining the infrared reflectance of specular surfaces by using thermographic analysis |
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| Affiliation: | 1. Department of Environmental Engineering and Science, Feng Chia University, Taichung 407, Taiwan;2. Department of Chemical Engineering, University of the Philippines, Diliman, Quezon City 1101, Philippines;3. Department of Chemical Engineering, Mindanao State University, Marawi City 9700, Philippines;4. Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan;1. Centre for Process Integration, Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M13 9PL, UK;1. Research Institute for Industrial Technology, Aichi Institute of Technology, Yakusa-cho, Toyota 470-0392, Japan;2. Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan;3. Graduate School of Engineering, University of Hyogo, 2167, Shosha, Himeji 671-2280, Japan;4. YUMEX Inc., Itota 400, Yumesaki-cho, Himeji 671-2114, Japan;5. Interaction Research Center for Nuclear Materials Science, Tohoku University, 2145-2, Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1313, Japan |
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| Abstract: | Specular surfaces as glass, mirrors and metals are commonly used in solar devices and in building facades. Determining the temperature distribution of such kind of surfaces allows estimating their thermal losses and detecting hot spots and temperature gradients that provokes material stress and rupture. In this sense, thermography is a non-contact measurement technique that is capable to quickly scan and record these surface temperature distributions, but when specular materials are inspected the infrared reflectance becomes a crucial parameter. This work describes a methodology to measure the reflectance of specular materials for different incidence angles in the infrared range 8 μm–14 μm, by using a thermographic camera and an infrared radiation source. The methodology includes the analysis of errors in the estimation of the reflectance and how to select the temperature of the source that minimizes these errors. The method is applied to different specular surfaces commonly used in building facades and solar devices, whose infrared specular reflectances are estimated for different incidence angles. The obtained results are analyzed in order to provide valuable information for in-situ thermographic measurements of specular surfaces. |
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| Keywords: | Infrared reflectance Thermography Infrared optical properties Specular materials |
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