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光缆线路应变监测对于通信系统的安全运行及预警等具有重要的意义。利用光缆内单模光纤中的自发布里渊散射,其频移和外界应变变化呈线性关系,构建布里渊光时域反射传感系统(BOTDR)。对长57m光缆施加拉力,利用BOTDR传感技术,对光缆所承受的拉力进行测量。随着拉力增加,光缆内布里渊频移增加,所测得光纤应变增加,多次测量具有重复性。BOTDR测量结果略小于光缆拉力试验机的测量结果,其误差为1.6%,这是由应力传递引起的。实验结果表明,BOTDR传感技术能够准确的、分布式的实现光缆沿线应变监测,可为通信光缆的机械性能监测供技术支持。
Fiber optic cable strain monitoring for the safe operation of communications systems and early warning has important significance. Using the self-propagating Brillouin scattering in the single-mode optical fiber cable, the frequency shift and the external strain change have a linear relationship, and the Brillouin optical time-domain reflectometry system (BOTDR) is constructed. Tensile force is applied to the long 57m optical fiber cable, and the tension of the optical fiber cable is measured by using the BOTDR sensing technology. With the increase of tension, the Brillouin frequency shift in the optical cable increases, the measured optical fiber strain increases, and the repeatability of multiple measurements. The BOTDR measurement is slightly less than the optical cable tensile testing machine with an error of 1.6% due to stress transfer. The experimental results show that the BOTDR sensor technology can accurately and distributedly monitor the strain of fiber optic cables and provide technical support for the mechanical performance monitoring of the fiber optic communication cables.