平面金属基板上の塗膜の指向単色ふく射率*
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概要
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An investigation on the emissive property of the coating film-metal substrate system, with attention to the thermal radiation inside the medium, is performed to derive an equation of the directional spectral emittance in connnection with optical constants and film thickness, and then the analytical solution is compared with the measured values of a coated surface on aluminum plate. In the range 0＜k_1≦0.1, the emissive property of the coating film on a metal can be considered as a function of dimensionless optical thickness τ. When τ≧0.25, the emittance of a coating film on the metal agrees with that of the calculated value from Fresnel’s formula, and forτ＜0.25, the emittance decreases by an influence of the emissive property of metallic substrate with decreasing τ. In the wavelength region from 3 to 8 microns, the calculated values coincinde with the measured values of surfaces with silicon-orange paint and acrylic-melamine resin.
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