基于两模光纤φ-OTDR的振动检测方法及实验研究  

Vibration Detection Method and Experimental Study Based on Two Mode Fiber-OTDR

作　　者：秦祖军[1] 银珊 QIN Zujun;YIN Shan(Guangxi Key Laboratory of Optoelectronic Information Processing,Guilin University of Electronic Technology,Guilin,Guangxi Province,541004 China)

机构地区：[1]桂林电子科技大学广西光电信息处理重点实验室,广西桂林541004

出　　处：《科技创新导报》2020年第25期92-97,共6页Science and Technology Innovation Herald

基　　金：国家自然科学基金(项目名称:基于少模光纤非线性效应的模式转换研究,项目编号:61665001);光电教指分委2019年“新工科建设与实践”教育教学研究项目(项目名称:新工科背景下的“光+”模块化课程体系建设,项目编号:gdyljs39)。

摘　　要：研究了基于两模光纤和相位敏感光时域反射计(φ-OTDR)的振动检测系统。两模光纤支撑LP01模和LP11模稳定传输。实验结果表明,LP01模和LP11模的后向瑞利散射信号经相干检测和正交解调后,均可独立检测出振动信号并进行准确定位;同时,两种模式均复原500Hz的振动信号波形。本实验通过提供基于两模光纤的振动信号检测方法,旨在培养学生的研究、探索与创新能力。A vibration detection system combined by a two-mode f iber(TMF)and phase sensitive optical time domain ref lectometer(φ-OTDR)is investigated.The TMF supports the transmission of the LP01 and LP11 modes.It is proved that each mode supported by the two-mode f iber(i.e.,LP01 mode and LP11 mode)can be used as an independent channel to detect the vibration signal with an acceptable signal-to-noise ratio after processing by coherent detection and IQ demodulation.In addition,both modes restore 500Hz vibration signal waveform.By providing a vibration signal detection method based on two-mode fiber,this experiment aims to cultivate students'ability of research,exploration and innovation.

关 键 词：相位敏感光时域反射计 两模光纤 振动检测 差分累加算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]