圆形截面纤维的笛卡尔线及特征

Descartes ray and character of round-section fibers

分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象———笛卡尔线现象。在理论分析的基础上,通过试验着重研究了纤维笛卡尔线的产生机理、特征和主要影响因素。结果表明,透明圆形截面纤维在垂直纤维轴光线照射时有笛卡尔线产生,其原理与水珠在光照射时虹产生的原理相似。

An analysis is made about Descartes rays of transparent round-section fibers——a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis. Production principle, character and primary influence factors of Descartes ray are studied by experiments on the basis of theoretical analysis. It is proved that round-section fiber has Descartes rays, and its principle and characteristics are similar to the water drops producing the rainbow in the sun.