基于光纤光栅的液体粘度测量方法的研究  

Study on Measurement Method of Liquid Viscosity Based on Fiber Bragg Grating

作　　者：陈曦[1] 赵美蓉[1] 黄银国[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《传感技术学报》2017年第2期189-193,共5页Chinese Journal of Sensors and Actuators

基　　金：国家重大科学仪器设备开发专项项目(2013YQ030915);国家自然科学基金青年科学基金项目(61304246)

摘　　要：针对液体粘度在线测量问题,提出了一种基于光纤光栅的液体粘度测量方法,即通过检测光纤光栅中心波长的变化量测得液体自身的粘度值。这种依靠液体自身流动得到液体粘度的方法是对粘度在线测量问题的一种新的探索和突破。在液体流动过程中,利用光纤光栅感知阻流元件表面粘滞力引起的悬臂梁的应力变化,对解调出的波长变化量经过计算得到应力变化的大小,从而得到相对应的粘度值。通过实验研究,对于粘度标准液进行光纤光栅的标定,建立了中心波长变化量与粘度的数学模型。最终,进行验证性实验,测量一组液体的粘度值,并与标准粘度计测得的结果进行比对,证明了实验方法的可行性。According to the online measurement of liquid viscosity,a new measuring method based on the fiber Bragg grating（FBG）is proposed.Through this method,the liquid viscosity can be derived from the variation of the FBG center wavelength.This method,the viscosity can be obtained by the fluid flowing,is a new exploration and breakthrough.Using FBG to sensing the stress change of cantilever beam caused by viscous force on the surface of the blocking element with the liquid flowing.Then,the stress change will be calculated by the center wavelength variation obtained from the FBG interrogator,thereby the corresponding viscosity value can be gotten.Through the experimental study,the measurement system was calibrated by the standard viscosity liquids,and the mathematical model between the center wavelength variation and the liquid viscosity was established.Eventually,the verification experiments,test results of a group of liquid viscosity from this measurement system comparing with the result from the standard viscometer,has verified the feasibility of the experimental method.

关 键 词：液体粘度在线测量 光纤光栅 波长变化量 阻流元件 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]