30km远程分布光纤拉曼温度传感器系统的实验研究

Experimental Research of 30 km Long Distance Distributed Optical Fiber Raman Temperature Sensor System

研制成功一套 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和 15 5 0nm掺铒光纤激光器作为抽运源及高速瞬态波形采样技术 ,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。使用智能化恒温技术 ,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问题。经鉴定 ,远程分布光纤拉曼温度传感器系统的主要技术指标如下 :光纤长度为 31km ,测温范围为 0～ 10 0℃ (可扩展 ) ,温度测量不确定度为± 2℃ ,温度分辨率为 0 1℃ ,测量时间为 4 32s,空间分辨率为 4m。

A 30 km long range distributed optical fiber Raman temperature sensor (DOFRTS) system has been made, it use new measuring temperature principle of optical fiber amplified anti Stokes Raman spontaneous scattering. In the system, 1550 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: optical single mode fiber: 31 km, temperature rang: 0～100℃ (can be expanded), temperature measuring uncertainty: ±2℃, temperature resolution: 0.1℃, measurement time: 432 s, spatial resolution: 4 m. The contrast table of the performance of DOFRTS system is given in the paper.