Distributed Vibration Sensor Based on Coherent Detection of Phase-OTDR
Distributed Vibration Sensor Based on Coherent Detection of Phase-OTDR
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DOI：
10.1109/jlt.2010.2078798
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发表时间：
2010-11-15
影响因子：
4.7
通讯作者：
Bao, Xiaoyi
中科院分区：
文献类型：
--
作者：
Lu, Yuelan;Zhu, Tao;Bao, Xiaoyi
针对相位光时域反射系统，采用外差检测和滑动平均、滑动微分信号处理技术，研制了一种分布式振动传感器。本文首次利用分布式振动传感器对断齿振动产生的宽带声频分量进行了现场测量和识别。裂缝破裂测量是一种标准技术，用于模拟混凝土或钢桥中裂缝的声发射，以进行早期裂缝识别。空间分辨率为5 m，最高频率响应为1 kHz，受数据采集卡触发频率的限制。这种新型传感系统可用于各种土木结构的振动检测和健康监测以及任何动态监测要求。
We developed a distributed vibration sensor by using heterodyne detection and signal processing of moving averaging and moving differential for the phase optical time domain reflectometry system. The broadband acoustic frequency components generated by pencil-break vibration have been measured and identified in location by our distributed vibration sensor for the first time. Pencil break measurement is a standard technique to emulate the acoustic emission of cracks in concrete or steel bridges for early crack identification. The spatial resolution is 5m and the highest frequency response is 1 kHz, which is limited by the trigger frequency of data acquisition card. This new sensing system can be used for vibration detection of health monitoring of various civil structures as well as any dynamic monitoring requirement.