在对光纤背向喇曼散射温度效应理论分析的基础上,研制了基于单模光纤的5km分布式温度传感器。实验比较了温度传感解调方法,选择反斯托克斯(Anti-Stokes)和斯托克斯(Stokes)背向喇曼散射光强度比值进行解调。介绍了系统的硬件组成和软件实现。实验表明,系统能精确地进行分布式测温,温度分辨率为1℃,空间分辨率为2m。 Based on the theoretical analysis of the temperature dependence of Raman backscattering, a 5km distributed temperature sensor based on single mode fiber was developed. The temperature-sensing demodulation method was compared experimentally, and the ratios of backscattered Raman scattering light intensity of Anti-Stokes and Stokes were chosen for demodulation. Introduced the system hardware and software implementation. Experiments show that the system can accurately distributed temperature measurement, the temperature resolution of 1 ℃, the spatial resolution of 2m.