30km远程分布光纤拉曼温度传感器系统

30 km Long Distance Distributed Optical Fiber Raman Temperature Sensor System

研制了30km远程分布光纤拉曼温度传感器(DOFRTS)系统。采用了新的光纤放大的反斯托克斯背向拉曼自发散射测温原理,用1550nm掺铒光纤激光器作为抽运源,采用高速瞬态波形采样技术和累加平均等信号处理技术,提高了信噪比,解决了弱信号检测问题;采用了智能化恒温技术,使主要元器件在恒温条件下工作,解决了工程应用中环境的适应性。远程DOFRTS已达到的主要技术指标为:光纤长度31km;测温范围0～100℃(可扩展);温度测量不确定度±2℃;温度分辨率0.1℃;测量时间432s;空间分辨率4m。

A 30 km long range distributed optical fiber Raman temperature sensor(DOFRTS) system was presented.It use new measuring temperature principle of optical fiber amplified anti-Stokes Raman spontaneous scattering.In the system,1 550 nm erbium-doped optical fiber laser,high speed data acquisition card and signal processing technique are used.By using these technique,the problem of weak signal detection is resolved and signal to noise ratio is increased.All components of system are put into an intellectualized constant temperature box and work in constant temperature condition.Stability and environment adaptability are improved.By appraisal,performance of the system is listed as follows:length of single mode fiber 31 km,measuring temperature range 0～100 ℃ (can be expanded),measuring uncertainty ±2 ℃,temperature resolution 0.1 ℃,measurement time 432 s,spatial resolution 4 m.