【摘要】 利用光纤中的布里渊散射光频移与温度和应变呈线性关系的原理,提出了一种基于自发布里渊散射的双支路分布式光纤传感系统。该系统利用不同种类光纤的布里渊频移差别,同时对两条线路的应力和温度进行监测,实现对被测对象多方位的同时测量,缩短了探测时间,提高了工作效率。本文实现了两路光纤的同时监测,用6km的光纤作为传感介质,获得了4m的空间分辨率。得到的实验结果表明,提出的系统能准确判断40ns脉冲光在两路传感光纤沿线产生的自发布里渊背向散射光谱的中心频率变化。更多还原

【Abstract】 On the basis of linear dependence of Brillouin frequency shift in fiber on both strain and temperature,this paper proposes a distributed fiber sensing system based on spontaneous Brillouin back-scattering light.By the differences of Brillouin shifts from different kinds of optical fibers,this system can be used to distinguish the sensing area,and to obtain the temperature and strain information of different lines at the same time,so that the detecting time is shortened and work efficiency is improved.Proposed system realizes synchronous detection for two optical fiber lines,and obtains the 4 m resolution when a 6 km fiber is used as sensing media.Obtained experimental results show that the system can get the variety of the spontaneous Brillouin back-scattering light caused by a 40 ns pulse in the two sensing lines.更多还原