On the basis of theories of physics , geometrical optics and photometry , the optical properties of collimated light beam incident upon single fiber perpendicular to the fiber axis are studied . by exploring the behaviors of reflected light and transmitted light from single fiber , the distribution of the light is described and the proportionalities between the intensity of the reflected , transmitted and scatered light are obtained respectively , and the different laws governing the intensity of diffused light and transmitted light from single fiber between near and far field are discussed . experiments demonstrate that the decrease of projecting light in far field is in direct proportion for the increase of fiber diameter , which serves as the theoretical basis for a series optics equations , as well as for the designment for photoelectric deviccs for detecting fibers 结合物理学的基本原理和几何光学的基本规律以及光度学的基础理论等三方面,研究了单纤维在平行均匀光束垂轴入射时的光学性质.分析了单纤维反光和透光的特征,光强分布及反射光、透射光和散射光的相对大小;讨论了在近场和远场条件下,漫反射光和透射光光强的不同规律;通过实验验证了远场时,纤维的漫射光强度与纤维直径成正比的关系
