作者：邹捷¹, 王宇¹, 张建国¹, 刘昕¹, 白清¹, 王东¹, 靳宝全^1,2

作者单位：1. 太原理工大学 新型传感器与智能控制教育部与山西省重点实验室, 山西 太原 030024;
2. 山西晋城无烟煤矿业集团有限责任公司 煤与煤层气共采国家重点实验室, 山西 晋城 048012

关键词：光纤传感;振动检测;相干光时域反射;后向瑞利散射光

摘要：

针对基于相干光时域反射的分布式光纤振动传感系统中数据量庞大，且需要信号发生器外部驱动，集成度低的缺点，利用现场可编程逻辑门阵列实现传感数据的高速采集与声光调制器的同步驱动，采用USB 3.0实现采集模块与上位机的实时数据传输。搭建一种基于相干光时域反射的分布式光纤振动传感系统，利用本地光与后向瑞利散射光的拍频效应，实现对微弱后向瑞利散射光信号的探测，并提高系统的传感距离。采用正交相位解调方法获取振动信号的位置信息。实验结果表明：该系统可在22 km传感光纤上对振动信号进行有效定位，定位误差在20 m以内，且系统对正弦波和方波等不同形态的振动信号定位效果一致。

Development of a distributed optical fiber vibration sensing system based on coherent optical time domain reflectometry
ZOU Jie¹, WANG Yu¹, ZHANG Jianguo¹, LIU Xin¹, BAI Qing¹, WANG Dong¹, JIN Baoquan^1,2
1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China;
2. State Key Laboratory of Coal and CBM Co-mining, Shanxi Jincheng Anthracite Mining Group Co., Ltd., Jincheng 048012, China
Abstract: To solve the problem of large data, the need for external driving of the signal generator and low integration of the distributed optical fiber vibration sensing system based on coherent optical time domain reflection, the high-speed acquisition of the sensing data and the synchronous driving of the acousto-optic modulator are realized by the field programmable logic gate array, and USB 3.0 is used to complete the real-time transmission of data between the acquisition module and the host computer. A distributed optical fiber vibration sensing system based on coherent optical time domain reflection is built. The beat effect of local light and backward Rayleigh scattered light is used to detect the weak backward Rayleigh scattered light signal and improve the sensing distance of the system. The quadrature phase demodulation method is used to obtain the position information of the vibration signal. The experimental results show that the system can effectively locate different vibration signals such as sine wave and square wave and the vibration signals can be located effectively on the 22 km sensing fiber, and the positioning error is within 20 m.
Keywords: optical fiber sensing;vibration detection;coherent optical time domain reflection;backward Rayleigh scattering light
2019, 45(6):114-120,152  收稿日期: 2018-07-12;收到修改稿日期: 2018-09-11
基金项目: 山西省煤层气联合研究基金资助项目（2016012011）；山西省重点研发计划社会发展项目（201703D321037）；山西省应用基础研究计划（201701D221115）；山西省回国留学人员科研资助项目（2016-035）
作者简介: 邹捷(1993-),女,江苏泰州市人,硕士研究生,专业方向为光纤传感检测
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