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

研制了一种利用光纤和椭球面镜测量反射和传输特性的光谱测量系统。测量了几种环境组成材料从可见光到中红外区域的半球反射光谱和透射谱。考虑吸收率的影响，研究了材料的反射和透射率的方向性，许多环境组成材料的吸收率即使在中红外区域也充分小于1.0。对于散射材料，除了吸收带外，在可见光范围内，漫反射优于表面反射。随着波长的增加，反射特性受表面条件的影响更大，利用辐射传输的四通量模型对测量数据进行了分析。通过获得的散射和吸收系数谱可以估计其辐射性质。

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.