空时域混合差分法在光纤光栅传感器的检测与定位研究  

Research on Detection and Location of Fiber Bragg Grating Sensors by Space-time Domain Hybrid Difference Method

作　　者：王红[1] 徐学武 赵克 陶辉 潘家栋 WANG Hong;XU Xue wu;ZHAO Ke;TAO Hui;PAN Jia dong(School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Guilin Guangming Technology Industrial Co.,Ltd.,Guilin 541004,China)

机构地区：[1]桂林电子科技大学机电工程学院,广西桂林541004 [2]桂林市光明科技实业有限公司,广西桂林541004

出　　处：《仪表技术与传感器》2020年第4期20-22,30,共4页Instrument Technique and Sensor

基　　金：桂林市科学研究与技术开发计划项目(20170102-1);广西科技重大专项项目(2018AA28002)。

摘　　要：在对光纤光栅传感器检测与定位时,因偏振衰弱影响,传感器定位准确率下降,故提出一种基于空时域混合差分的检测定位法。分别在空间域和时间域对光纤中返回的光强进行差分处理,并在空间域和时间域分别设置相应的光强检测阈值,可提高光纤光栅传感器的定位准确率。并在光纤长度为100 m、空间分辨率为1 m的实验条件下进行了多次验证,结果表明该方法具有可行性,与现有时域、空域差分检测定位法相比,光纤光栅传感器的定位准确率得到了提高,具有实用价值。When detecting and locating the fiber Bragg grating sensor,the accuracy of sensor positioning was reduced due to the influence of polarization weakening.Therefore,a detection and localization method based on hybrid time difference in space-time domain was proposed.The optical intensity returned in the optical fiber was differentially processed in the spatial domain and the time domain,and the corresponding light intensity detection thresholds were respectively set in the spatial domain and the time domain,thereby improving the positioning accuracy of the FBG sensor.The experiment was carried out several times under the experimental conditions of fiber length of 100 meters and spatial resolution of 1 meter.The results show that the method is feasible.Compared with the existing time domain and spatial differential detection and positioning methods,the fiber grating sensor is accurate.The rate has been improved and has practical value.

关 键 词：光纤光栅传感器 检测与定位 偏振衰弱 空时域混合差分 光强阈值 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN253[自动化与计算机技术—控制科学与工程]