基于光频域反射仪的应变实时监测系统(特邀)

Strain Real-time Monitoring System Based on Optical Frequency-domain Reflectometry(Invited)

在分布式光纤传感技术中,光频域反射仪(optical frequency-domain reflectometry,OFDR)凭借高空间分辨率及高灵敏度等特点,在测量应力和温度等物理量测量方面有很大优势。结合弱反射光纤光栅阵列搭建了一套OFDR分布式传感系统,并使用可视化编程平台实现了数据的采集和处理,最终能够实时显示弱反射光纤光栅阵列中任一点的应变或温度测量结果。实验结果显示,所搭建的分布式传感系统具备0.08 mm空间分辨率,6.9με的应变测量精度,1 Hz应变测量刷新率的测量能力,具备分布式动态应变实时监测的能力。在石油化工和航空航天等需要高空间分辨率和实时动态应变感知能力的领域,所研制的分布式光纤应变传感系统将拥有广阔的应用前景。

In distributed optical fiber sensing technology,the optical frequency-domain reflectometry(OFDR)has a great advantage in measuring physical quantities such as stress and temperature by virtue of its high spatial resolution and high sensitivity.A set of OFDR distributed sensing system is built by combining weak-reflection fi⁃ber grating array,and the visual programming platform is used to realize the collection and processing of data,and ultimately the strain or temperature measurement results at any point in the weak-reflection fiber grating array can be displayed in real time.Experimental results show that the distributed sensing system constructed has a spatial resolution of 0.08 mm,a strain measurement accuracy of 6.9με,a measurement capability of 1 Hz strain measure⁃ment refresh rate,and the ability of distributed dynamic strain monitoring in real time.In petrochemical,aerospace and other fields that require high spatial resolution and real-time dynamic strain sensing capability,the distributed optical fiber strain sensing system developed will have a broad application prospect.