Abstract
A high-speed spectrophotometer system is developed to study radiation characteristics of materials. The system allows measurements of the spectra at wavelengths of 0.35–10μm repeatedly with a period of less than 1 s. It is applied to the study of transient behaviors in reflection characteristics of heat-resisting alloys and the constituent transition metals in air-oxidation processes at high temperatures. An interference phenomenon due to the multiple reflection at the upper and lower boundaries of the oxide film is observed in the diffuse reflection spectra of oxidizing rough-finished surfaces as well as in the specular reflection spectra of oxidizing specular-finished surfaces. The phenomenon is found to be fairly reproducible and consistent over all the materials investigated. It is attributed to the interference and diffraction of radiation at three-dimensional nonparallel film elements of the polycrystalline oxide grains. A possibility is suggested for the theoretical modeling of radiation characteristics of real surfaces in the actual environments of industry.
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