光纤后向拉曼散射的温度特性及其应用

Temperature Character of Optical Fiber Raman Backscattering and its Application

利用波长为９０５ｎｍ，ＧａＡＳ大功率半导体脉冲激光器为泵浦光源，采用光时域反射ＯＴＤＲ（ＯｐｔｉｃａｌＴｉｍｅ－ＤｏｍａｉｎＲｅｆｌｅｃｔｏｍｅｔｒｙ）技术，以及高速采样平均技术对芯径为５０／１２５μｍ，１ｋｍ长的ＧＩ多模光纤的后向散射光光谱进行了分析与测量．着重研究了光谱成份中，强度仅为入射光强的１０－８～１０－９极其微弱的反斯托克斯散射光的温度特性及其应用—分布光纤温度传感系统．

A high power pulsed laser diode is used to pump a 1 km GI multimode optical fiber in which the ratio of core to cladding is 50/125 μm. Meanwhile, the OTDR (Optical Time Domain Refiectometry) technique and high speed sample average technique are adopted to measure and analyse spectra from backseattering fibers. The study of the temperature character of anti-stokes SCattering, the intensity of which is only 10-8～10-9 of the incident light, and its aPPlication in the distributed optical fiber temperature sensors are emphasized.