基于Φ-OTDR的分布式光纤声波传感系统相位解调方法研究  

Research on phase demodulation method of distributed fiber optic acoustic wave sensing system based onΦ-OTDR

作　　者：李佳阳 周哲海[1] 李子豪[1] 邵祎康 张东旭 王彦丁 LI Jiayang;ZHOU Zhehai;LI Zihao;SHAO Yikang;ZHANG Dongxu;WANG Yanding(Beijing Information Science and Technology University,Key Laboratory of the Ministry of Education For Optoelectronic Measurement Technology and Instruments,Beijing,100192;The 13th Research Institute of the Ninth Research Institute of China Aerospace Science and Technology Corporation,Beijing,100854;XI’AN Jiaotong University,School of Life Science and Technology,Xi’an,710049)

机构地区：[1]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [2]中国航天科技集团公司第九研究院第十三研究所,北京100854 [3]西安交通大学生命科学与技术学院,西安710049

出　　处：《激光杂志》2022年第9期14-19,共6页Laser Journal

基　　金：北京长城学者支持计划项目(No.CIT&TCD20190323);北京青年拔尖人才支持计划项目(No.Z2019042);国家自然科学基金项目(No.61875237);2020年度北京市实培计划项目。

摘　　要：分布式光纤传感技术有着检测范围大、传输距离广、结构简单等特点,在大型公共设施的安全检测,油管道泄漏检测及防入侵报警系统等中有着极为广泛的应用。研究了Φ-OTDR高灵敏分布式光纤振动传感器的相位解调方法,分析使用积分法对原始信号的相位解调全过程,绘制了振动信号实时动态图,通过振动幅度以及相位变化的相关关系,获得了光纤链路上的振动位置,判断出在该实验环境中1号光纤前端100 m~120 m之间存在明显噪声点,130 m~140 m之间有相干衰落现象,证明了方法的有效性。该研究为进一步发展高灵敏度的基于Φ-OTDR的分布式光纤声波传感系统奠定了技术基础。Distributed optical fiber sensing technology has the characteristics of a large detection range,wide transmission distance and simple structure.It is widely used in the safety detection of large public facilities,oil pipeline leakage detection and anti-intrusion alarm systems.This paper studies the phase demodulation method ofΦ-OTDR highly sensitive distributed optical fiber vibration sensor.It analyzed the whole process of phase demodulation of the original signal using the integral method.It has also drawn the real-time dynamic diagram of the vibration signal,obtained the vibration position on the optical fiber link through the correlation between the vibration amplitude and phase change,and judged that there are obvious noise points between 100 m-120 m at the front end of No.1 optical fiber in the experimental environment.,There is coherent fading between 130 m and 140 m,which proves the effectiveness of the method.And the research results provide the technology basis for further development ofΦ-OTDR highly sensitive distributed optical fiber vibration system.

关 键 词：分布式光纤传感 Φ-OTDR 积分法相位解调 

分 类 号：TN29[电子电信—物理电子学]