Development of Measurement System of Spectral Reflection and Trans-mission Chracteristics of Environmental Surfaces in Middle Infrared Region

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A spectral measurement system for reflection and transmission properties by using an optical fiber and an ellipsoidal mirror was newly developed. The hemispherical reflectance and transmittance spectra of several environmental constituent materials were measured from visible to middle infrared region. The directional characteristics of reflection and transmission were also investigated in consideration of the absorptance.The absorptance of many environmental constituent materials was sufficiently less than 1.0 even in middle infrared region. As to the scattering materials, in visible region, the diffuse reflection was superior to the surface reflection except for the absorption band. As the wavelength increased, the reflection characteristics were more affected by the surface condition.The measured data were analyzed by using a four-flux model of radiation transfer. The radiation properties could be estimated by the obtained scattering and absorption coefficient spectra.