【摘要】 基于菲涅尔原理设计了一种结构简单的新型光纤折射率测量仪。实验采用同时监测输入光P0、反射光P,消除光源不稳定产生的误差;理论推导了折射率随光强的变化关系,并引入修正因子η;选择空气和水作为样品进行了测试,测得25℃时样品在1550nm波长的折射率分别为1.0025和1.3122,与参考值相对误差不大于0.27%,实现了气体和液体折射率的测量。该装置可用于折射率的实时监测,适用于工业在线监测物体折射率。更多还原

【Abstract】 Based on the Fresnels′ principle,a fiber refractometer was designed with a simple structure.The measure error induced by the source variation was erased by comparing the input power P₀ and reflected power P.Relation of the light power and the refractivity is deduced and modifying factor η is introduced.As samples of gas and liquid,air and water were selected to be measured.The experiment values were separately 1.002 5 and 1.312 2 at 1 550 nm in 25 ℃ and relative error with the data was no more than 0.27%.This device can be used in line to monitor the refractivity.更多还原