Spectral Radiative Properties of Fibrous Materials in Visible and Near Infrared Regions

1996 ~ 1998年，对碳纤维布、几种纤维布、玻璃棉绝缘体和铝纤维等纤维材料在可见光和近红外波段的光谱辐射特性进行了测量和研究.利用辐射传输方程，通过给定纤维材料的特征参数，如纤维直径及其分布、空隙率、光学常数和试件厚度，估算纤维材料的方向光谱透射率和反射率.用测角仪和多用途光谱辐射计测量了定向光谱透射率和反射率。利用积分球和分光辐射计测量了纤维材料的半球光谱辐射特性.除了波长范围a短于0.35 μ m和a长于0.8 μ m外，纤维材料光谱特性的计算值和测量值是一致的。用积分球测得的半球面性质与用CF片方向性测量数据计算的半球面性质吻合较好。但是用积分球测量的单片CF板的半球透过率比用定向透过率测量的数据计算的值大2倍左右.利用积分球测量数据，评价了材料和颜色对服装半球光谱特性的影响.测量了玻璃棉绝缘子的球面光谱透过率和反射率。玻璃棉绝缘子的吸收率随着比重的增加而增加。在比重大于48 kg/m_3的范围内，吸收率几乎不变。

In visible and near infrared wavelength regions, spectral radiative properties of fibrous material such as a carbon fiber sheet(CF-sheet), clothes of several kinds, a glass wool insulator and an aluminum fiber were measured and investigated from 1996 to 1998.The results obtained through measurements and analyses can be summarized as follows.1. Using the radiation transfer equation, directional spectral transmittance and a reflectance of the fibrous materials were estimate by given characteristics parameters of fibrous material such as diameter of fiber and its distribution, void ratio, optical constant and specimen thickness.2. The directional spectral transmittance and reflectance were measured with a goniometer and a multi-purpose spectroradiometer. The hemispherical spectral radiative properties of fibrous material were measured with an integrating sphere and the spectroradiometer.3. The calculated values and the measured values on the spectral properties of the fibrous materials were well agreements except the wavelength range a shorter than 0.35 mu m and a longer than 0.8 mum.4. The hemispherical properties measured with the integrating sphere and the hemispherical properties calculated from the data measured directional properties of the CF-sheet agreed well. But the hemispherical transmittance of single CF-sheet measured with the integrating sphere are greater than about two times the calculated values from the data of the directional transmittance measured.5. The influences of material and color on the hemispherical spectral properties of the clothes were evaluated by measured data with the integrating sphere.6. The spherical spectral transmittance and the reflectance of the glass wool insulators were measured. Absorptances of the glass wool insulator increase with increasing the specific gravity. The absorptances are nearly constant in range of specific gravity are greater than 48kg/m_3.