鉄鋼材料の酸化過程における分光放射率の非線形挙動

概要

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The authors have made clear that spectral emissivity ε(λ_0, t) of non-oxidized steel at the effective wavelength (λ_0=0.65μm) of optical pyrometer is approximately 0.4 and that the wavelength dependency in visible region is negative. But in case of oxidized surface, above-mentioned ε(λ_0, t) is increased to approximately 0.9 and the wavelength dependency is changed from negative to positive. When the oxidized film thickness is increasing, it is known that ε(λ_0, t) does not increase monotonously but increase in vibratory curve. The above-mentioned process is not still made clear yet. In this paper, the spectral emissivity ε(λ_0, t) and the ratio of emissivity ε(λ_1, t)/ε(λ_2, t) at the two effective wavelengths (λ_1, λ_2) of twocolor pyrometer are measured during the steel oxidizing. And the vibratory curve should be considered as the light interference phenomenon. Consequently, taking account of nonlinearity, the dispersion model of light interference phenomenon is proposed and the experimental results can be explained well by the model.
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