圆形截面纤维皮芯结构对其内部反光性能的影响

Influences of Round-Section Fiber's Skin-Core Structure to Internal Reflected Light

借助纤维内部反射光中的笛卡尔线,针对纤维皮层厚度及皮芯层折射率差异对内部反射光的影响,从理论上进行分析,认为纤维皮芯结构中仍存在笛卡儿线.在薄壁玻璃管中加入一定折射率的液体,对其二维漫反射光强进行测试,验证了理论分析的结论.研究表明:纤维皮芯层折射率差异对笛卡儿线出射角的影响,大于纤维皮层厚度变化对纤维笛卡儿线出射角的影响.纤维皮芯层折射率差异的增大会使纤维笛卡儿线的出射角增大,反光强度变小.

In the article, with the aid of the internal reflected light＇s Descartes ray, the influence of the skin thickness and the difference of skin-core structure＇s refractive index on reflected light are systematically analyzed based on the theory. Descartes ray also exists in skin-core structure. Joining the certain refractive index liquid into a thin-wall glass tube, the intensity of two-dimensional diffuse reflection is tested, which confirms the conclusion of theoretical analysis. The research indicates that the difference of skin-core structure＇s refractive index influences the emergent angle of Descartes ray more than the change of skin thickness. The increase of the difference of refractive index will make the emergent angle of Descartes ray increase. The intensity of reflection light decreases.