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基于法布里珀罗干涉仪的液体浓度实时检测系统的研究

Research on Liquid Concentration RealTime Detecting System Based on Fabry-Pérot Interferometer

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摘要

设计了一种对透明液体浓度进行高精度测量的动态跟踪系统。该系统根据液体的浓度与折射率关系以及折射率与光纤法布里珀罗(F-P)干涉仪干涉光波波长、级次之间关系,通过测量法布里珀罗干涉仪干涉级次的变化量,获得液体浓度的变化量。系统中光源选用He-Ne激光器,波长为632.8 nm,输出功率为2 mW,法布里珀罗干涉腔反射面的反射系数为0.9~0.95,平行度为(1/10~1/20)光波波长,平面度为(1/20~1/100)光波波长,接收干涉条纹的器件采用电荷耦合器件(CCD),对电荷耦合器件输出的信号进行二值化处理时采用阈值浮动措施,消除光强波动带来的测量误差。通过对一组不同浓度酒精进行测量,该系统可识别出0.01℅的浓度变化。

Abstract

A kind of dynamic tracking system for conducting high-precious measurement of transparent liquid concentration is designed. In accordance with the relations between liquid concentration and refractive index as well as the relations among refractive index, interference light wavelength of optical-fiber Fabry-Pérot (F-P) interferometer and grade orders, the liquid concentration variable quantity is obtained by measuring the variable quantity of fringe interference order. In this system, light source is He-Ne laser. Wavelength is 632.8 nm. Output poweris 2 mW. Reflectance of interference cavities is 0.90~0.95, the plane degrees of two reflective surfaces are 1/20~1/100 wavelength, and their parallel degrees are 1/10~1/20 wavelength. Linear charge coupled device (CCD) receives interference frings. When the output signals by linear CCD are processed in two-valuation, the threshold floating measures adopted can eliminate measurement error. The detecting system can recognize or detect concentration variations of 0.01% via measuring a group of alcohol.

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中图分类号:TN247

所属栏目:仪器,测量与计量

收稿日期:2004-12-28

修改稿日期:2005-03-16

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杨秀芳
王小明
高宗海
赵念念

备注:杨秀芳(1965~),女,陕西乾县人,讲师,主要从事光学仪器、光电检测技术、光纤传感器的研究。

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