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利用液滴指纹图实现溶液折射率的精确测量

Accurate Measurement of Liquid Refractive Index Using Liquid Droplet Fingerprints

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摘要

提出一种利用光纤-电容液滴分析仪进行溶液折射率精确测量的方法。利用最小二乘法拟合得到与水表面张力近似溶液(NaCl、葡萄糖等)的液滴指纹图第一峰的光纤值与折射率之间的线性模型;仿真分析乙醇、丙醇等与水表面张力相差较大的溶液的表面张力对液滴外形的影响,并提出带表面张力修正的折射率计算模型。实验结果表明,利用所提出的线性模型得到的葡萄糖和NaCl溶液的折射率平均误差为2.9447×10-4;利用带表面张力修正的折射率计算模型得到的为1.4381×10-4,且测试样品的最大相对误差为0.1258%。该方法对扩展液滴分析仪的适用性和提高其分析精度有一定意义。

Abstract

An accurate measurement approach to liquid refractive index of liquids with a fiber-capacitance droplet analyzer is proposed. A linear model between first peak values of liquid droplet fingerprints and refractive indexes is built by the least square method, where the surface tensions of glucose solutions and NaCl solutions are similar to that of water. The refractive index calculation model with surface tension modification is proposed based on the simulation analysis on influence of the surface tensions of ethanol and propanol solutions on droplet shape, where the surface tensions of ethanol solutions and propanol solutions have large difference with that of water. The experimental results show that, the mean error of glucose solutions and NaCl solutions by the linear model is 2.9447×10-4, the mean error of the tested solutions by the refractive index calculation model with surface tension modification is 1.4381×10-4, and the maximal relative error of tested solutions is 0.1258%. The proposed method is meaningful to extend applicability of fiber-capacitance droplet analyzers and improve the accuracy of refractive index measurement.

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中图分类号:TP212.9

DOI:10.3788/aos201737.0412002

所属栏目:仪器,测量与计量

基金项目:国家自然科学基金(51375338)

收稿日期:2016-09-29

修改稿日期:2016-12-08

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裘祖荣:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
陈哲:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
樊玉铭:天津大学精密测试技术及仪器国家重点实验室, 天津 300072

联系人作者:裘祖荣(qzr@tju.edu.cn)

备注:裘祖荣(1958-),男,博士,教授,主要从事精密测试技术及测量仪器方面的研究。

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引用该论文

Qiu Zurong,Chen Zhe,Fan Yuming. Accurate Measurement of Liquid Refractive Index Using Liquid Droplet Fingerprints[J]. Acta Optica Sinica, 2017, 37(4): 0412002

裘祖荣,陈哲,樊玉铭. 利用液滴指纹图实现溶液折射率的精确测量[J]. 光学学报, 2017, 37(4): 0412002

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