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Author: search.filters.author.Suesut, T.Subject: search.filters.subject.Emissivity

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    Detection of Foreign Bodies in Roasted Coffee by using Active Thermography
    (2017-01-01)
    Ngoensod, A.
    ;
    Nunak, N.
    ;
    Suesut, T.
    This paper presents the detection of foreign bodies in roasted coffee by using active thermography with real-time thermal image processing. Foreign bodies, including stone, wood, etc., are found in roasted coffee beans contaminated during drying process and transportation. The principle of radiation from objects with different emissivity and heat capacity is applied. The heat radiation from the roasted coffee and the foreign body are different; therefore, the thermal image can be used to identify the foreign objects. The active thermography system consists of a thermal image camera and computer image processing, heat source and conveyor system controlled by programmable logic controller. The testing and experimental results of the proposed system show that the foreign bodies in roasted coffee beans can be found in all batches, however, the number counting of foreign objects are inaccurate.
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    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.