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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.
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    3D metallic surface acquisition for inspection and reading character
    (2013-11-04)
    Suesut, T.
    ;
    Gulphanich, S.
    ;
    Roonprasang, K.
    This paper presents a real-time implementation of 3D acquisition for reading text and inspection the metallic surface based on light sectioning. A measurement is achieved with a standard low cost CMOS camera. Surface defects are modeled as deviations in the local relief from a smooth approximation of the surface. Discrete orthogonal bases are used to generate a smoothed global model of the surface structure. Modified discrete Tchebychev polynomials are used as orthogonal basis functions to perform least square approximations of the geometry. QR decomposition is used to obtain a unitary basis, minimizing the numerical effort when modeling surfaces. The result of test measurements on copper sheets in a production environment is presented to demonstrate the surface inspection. Another result is shown the readable character on the textured metallic surface after the proposed processing. A prototype system of the laser scanning instrument can be implemented in a production line as well. © (2013) Trans Tech Publications, Switzerland.