基于光纤Fresnel反射原理的溶液浓度测量方法研究

Research on Measuring Solution Concentration Based on Fresnel Reflection Principle in Optical Fiber

针对传统溶液浓度测量方法的不足,提出了一种基于光纤端面反射原理的溶液浓度测量方法。通过Fresne(l菲涅耳)定律以及折射率与溶液浓度关系,建立了反射光强同溶液浓度的函数关系,分析了反射光强变化的规律特征,指出反射光强随溶液浓度变化应具有保持线性关系。并且通过蔗糖溶液和葡萄糖溶液的实验研究,验证了反射光强随溶液浓度变化符合线性关系特性,线性拟合度达到99%以上。该方法可用于蔗糖、葡萄糖等溶液浓度的在线测量,具有线性度高、操作简单、易于实现特点。

For the improvement of traditional measurement method for solution concentration, a method of mea-suring concentration is proposed, which is based on the Fresnel principle in optical fiber. Through the Fresnel reflec-tion formula and the relationship between refractive index and concentration, the concentration-dependent powerchanges are demonstrated, and the characteristics of the reflected power changes are also analyzed correspondingly.The reflected power should change with the variation of solution concentration and keep a good linearity. Further-more, the experimental research prove the linearity between the power and solution concentration by using the su-crose solution and glucose solution,and the linear fitting factor is more than 99%. This method can be used for online measurement of the concentration of sucrose, glucose and other solutions, which has high linearity, simple oper-ation, and easy to be operated.