基于传感技术的系统光纤光栅分布动态监测设计  

Design of systematic distributed dynamic monitoring of fiber Bragg grating based on sensor technology

作　　者：钟友坤 岑振宇 陆正杰 ZHONG Youkun;CEN Zhenyu;LU Zhengjie(Physics and Mechanical&Electrical Engineering School,Hechi University,Yizhou 546300,China;Guangxi normal University,Guilin 541004,China)

机构地区：[1]河池学院物理与机电工程学院,广西宜州546300 [2]广西师范大学,广西桂林541004

出　　处：《激光杂志》2022年第9期188-192,共5页Laser Journal

基　　金：广西高校中青年教师科研基础能力提升项目(No.2019KY0640);广西高等教育本科教学改革工程项目(No.2019JGZ143)。

摘　　要：由于传统方法缺少对光纤光栅动态信号特征的提取过程,导致其监测结果不准确、监测用时增加。为此,提出一种基于传感技术的系统光纤光栅分布动态监测方法。首先利用EWT方法将系统在不同状态下的光纤光栅动态信号划分为若干经验小波函数,然后计算各个分量的Hilbert谱,并采用时频直观表示不同分布条件下光纤光栅信号的频率特征信息。在计算各个EWT分量和原始信号间相关系数的基础上,提取相关度偏高的分量,构建信号对应的特征向量,再根据系统光纤光栅的分布特征,分析长周期系统光纤光栅的带阻滤波特性,得到光栅调制后的出射光。将传感技术和光电探测器两者相结合,对系统光纤光栅分布展开动态监测。实验结果表明:该方法能够有效减少特征提取用时和监测用时,并获取更加精准的监测结果。Because the traditional method lacks the extraction process of dynamic signal characteristics of fiber Bragg grating,the monitoring results are not accurate and the monitoring time is increased.Therefore,a systematic dynamic monitoring method of FBG distribution based on sensor technology is proposed in this paper.Firstly,the dynamic FBG signals in different states were divided into several empirical wavelet functions by EWT method,then the Hilbert spectrum of each component was calculated,and the frequency characteristic information of FBG signals under different distribution conditions was visually represented by time-frequency.Based on the calculation of the correlation coefficients between each EWT component and the original signal,the components with high correlation were extracted to construct the corresponding feature vector of the signal.Then,according to the distribution characteristics of the system’s fiber grating,the band-stop filtering characteristics of the long-period system fiber grating were analyzed to obtain the output light modulated by the grating.By combining the sensor technology and photodetector,the distribution of fiber Bragg grating in the system is dynamically monitored.Experimental results show that this method can effectively reduce the time of feature extraction and monitoring,and obtain more accurate monitoring results.

关 键 词：传感技术 系统光纤光栅 分布监测 特征提取 光电探测器 

分 类 号：TN247[电子电信—物理电子学]