光纤Bragg光栅液位传感器的传输理论及数值模拟  

Theoretical Analysis and Numerical Simulation on FBG Liquid Level Sensor

作　　者：刘一泓[1] 周树民[1] 杨明红[2] 周培[1] 

机构地区：[1]武汉理工大学理学院,湖北武汉430070 [2]武汉理工大学光纤传感技术研究中心,湖北武汉430070

出　　处：《武汉理工大学学报（信息与管理工程版）》2012年第5期555-557,580,共4页Journal of Wuhan University of Technology：Information & Management Engineering

基　　金：国家自然科学基金资助项目(60908020)

摘　　要：针对一种光纤Bragg光栅的液位传感器,采用传输矩阵法和多层模法对光在传感器光栅段的传输特性进行了详细分析。将在液体中与空气中两部分光栅的传输矩阵和光栅边界处的传输矩阵依次相乘,得出整段光栅的传输矩阵,进而得到整段光栅的传输特性。利用Matlab对液位传感器光栅段的传输特性进行数值模拟,得出了光纤Bragg光栅的反射率变化量随液位变化的规律,为实验研究奠定了基础。In accordance with a liquid-level sensor based on a fiber Bragg grating,utilizing the transfer matrix method and the Rouard′s method,the transfer characteristic of the Bragg grating in the sensor was investigated thoroughly.After multiplying the transfer matrices of the two grating segments surrounded by the liquid and air and the transfer matrix describing transition between the two regions,the transfer matrix of the whole structure was obtained.From this matrix the characteristic of the whole grating can be obtained.The relationship between the liquid level and the reflectivity difference of the grating was derived through a Matlab numerical simulation of the transfer characteristic of the Bragg grating in the sensor,which established the basis for experimental study.

关 键 词：光纤BRAGG光栅 传输矩阵 液位传感器 数值模拟 

分 类 号：TN253[电子电信—物理电子学]