BOTDA在城市角钢结构变形监测中的应用研究

Application Research of BOTDA in Deformation Monitoring of Urban Angle Steel Structure

针对城市钢结构建筑难以进行变形监测的问题,通过角钢不同位置布设分布式传感光纤,采用布里渊光时域分析技术(BOTDA)分布式光纤应变温度分析仪,采用裸光纤、紧套光纤两种类型光纤,10 cm、50 cm两种不同空间分辨率进行角钢变形实验分析。实验结果可知:分布式光纤应变传感技术应用于钢结构变形监测完全可以达到要求;裸光纤比紧套光纤更能反映钢结构形变;10 cm比50 cm空间分辨率信噪比低,抗干扰能力较低,在城市角钢结构的变形监测有较好的指导意义。

In view of the difficulty of deformation monitoring of urban steel structures,distributed sensing optical fibers are deployed at different positions of angle steel,Brillouin optical time domain analysis technology(BOTDA) distributed optical fiber strain temperature analyzer is used,and bare optical fibers and tight optical fibers are used. Two types of optical fibers,two different spatial resolutions of 10 cm and 50 cm,were used to analyze the angle steel deformation experiment. The experimental results show that the distributed optical fiber strain sensing technology can fully meet the requirements of steel structure deformation monitoring;bare optical fiber can reflect the steel structure deformation more than tight sleeve optical fiber;10 cm to 50 cm spatial resolution has low signal-to-noise ratio and relatively high anti-interference ability,which has good guiding significance in the deformation monitoring of urban angle steel structure.