分布式光纤振动和温度双物理量传感系统

Distributed Fiber-Optic Vibration and Temperature Sensing System

提出了一种分布式光纤振动和温度传感系统。该系统在双马赫-曾德尔干涉仪分布式振动传感系统的框架上,采用波分复用的方法在一条传感臂上耦合两种波长的光,并行实现了基于激光干涉的分布式光纤振动传感和基于拉曼背向散射的分布式温度传感,从而达到了振动和温度双物理量的同时探测。该方法有效利用了双马赫-曾德尔干涉仪的传感光纤,在实验中实现了10km长度上振动和温度双物理量的同时探测,振动传感的定位误差为±30m,温度传感的空间分辨率和温度精度分别为1m和±1.8℃。该系统的优点是将激光干涉和拉曼背向散射有效结合,实现了复杂环境中对振动和温度同时探测的需求,并有效利用了传感光纤,具有重要的实际意义和经济价值。

We propose a distributed fiber-optic vibration and temperature sensing system. The proposed system can obtain coupled light of two wavelengths on one sensing arm based on the structure of the dual Mach-Zehnder interferometer by employing the wavelength division multiplexing technique. The implement scheme can achieve the parallel detection of distributed fiber-optic vibration sensing based on laser interference and distributed temperature sensing based on Raman backscattering, thus the simultaneous detection of vibration and temperature is realized. The method effectively uses the sensing fiber-optic based on the dual Mach-Zehnder interferometer and realizes simultaneous detection of vibration and temperature at a distance of 10 km in the experiment. The positioning error of vibration sensing is ±30 m. The spatial resolution and temperature error of temperature sensing are 1 m and ±1.8 ℃, respectively. The advantage of the system is to combine laser interference with Raman backscattering effectively and realize simultaneous detection of vibration and temperature under the complicated condition. In addition, the proposed system effectively uses sensing fiber-optic and has great practical and economic value.