Measurement of Normal Spectral Emissivity of Liquid Copper

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The normal spectral emissivity of copper in solid and liquid states was measured at 1273 to 1673 K with wavelength during 400 to 850 nm. The ratio of radiation intensity to that at a reference wavelength of 650 nm was measured in order to avoid the difficulty of simultaneous measurement of the radiation intensity from a black body. The emissivity of copper increases in solid state and decreases in liquid state with increasing temperature and decreases with increasing wavelength in both states. At the melting point of 1358 K, the emissivity at 650 nm discontinuously increases from 0.123 in solid to 0.143 in liquid.

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  • ISIJ international  

    ISIJ international 37(4), 399-403, 1997-04-15 

    The Iron and Steel Institute of Japan

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