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

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    Emissivity measurements of reflective materials using infrared thermography
    (2016-01-01)
    Rakrueangdet, K.
    ;
    Nunak, N.
    ;
    Suesut, T.
    ;
    Sritham, E.
    This paper proposes the technique to measure the band emissivity using the infrared detector with a band pass filter of 7.5 to 14 um. The experimental setup consists of an infrared camera, K-type contact thermocouples, a tripod, a water bath, aluminium plate, a black tape, and an environmental control chamber. Three types of reflective engineering materials including aluminium, stainless steel, and copper are tested using this technique. Results are in good agreement with the findings from other literatures. Therefore, the proposed technique, which is easy to operate, can be an alternative method for measuring the emissivity of reflective materials. However, care must be taken in selecting the location the infrared camera, the material for lining internal surface of an environmental control chamber, and the temperature of chamber surface.
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    Surrounding effects on temperature and emissivity measurement of equipment in electrical distribution system
    (2015-01-01)
    Nunak, T.
    ;
    Nunak, N.
    ;
    Tipsuwanporn, V.
    ;
    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.