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Author: search.filters.author.Nunak, T.Subject: search.filters.subject.Infrared thermography

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    Surrounding effects on temperature and emissivity measurement of equipment in electrical distribution system
    (2015-01-01)
    Nunak, T.
    ;
    Nunak, N.
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    Tipsuwanporn, V.
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    Suesut, T.
    This paper reports the effect of surrounding conditions, e.g. IR radiation through IR window and the reflectivity and temperature of internal surface of chamber on the temperature and emissivity measurement. The results show that the transmission percentage of IR window is about 50 for all IR temperatures, except when the target temperature was the same as the surrounding temperature (T,ur). At this condition (Ts = Tc), the temperature readings were almost the same for all percentage of IR window. The accurate temperature measurement can be achieved by adjustment of the transmission correction in the IR camera or in the software. Considering the effect of materials surface and temperature of chamber, it can be concluded that the surrounding conditions can affect to the accurate emissivity measurement only with the high reflectance object, whereas the high emissivity object has no effect from the surround.
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    Item type:Publication,
    Emissivity estimation using thermographic camera
    (2013-11-04)
    Nunak, N.
    ;
    Roonprasang, K.
    ;
    Suesut, T.
    ;
    Nunak, T.
    This paper proposes a method based on the spectra response of IR detectors mounted on thermographic camera for emissivity measurement at various target surface temperatures, while the reflected temperature istaken into account, and also studies on the effect of surface roughness on the emissivity value. The emissivity (ε8-14μm) of general engineering material such as iron, stainless steel, brass, copper and aluminum obtained in this paper are in agreement with other literatures. Finally, results found that the roughness and emissivity of equipment increases with increasing of the operating time. © (2013) Trans Tech Publications, Switzerland.