基于分布式光纤传感的长大桥健康监测应用研究

Application Research on Health Monitoring of Long Bridge Based on Distributed Optical Fiber Sensing

本文提出采用布里渊光时域分析技术,在某长大桥的行车方向布设传感光缆,通过荷载对比、长期应变监测等试验,实现桥梁纵向整体的线性应变测量。结果证明该技术既突破了传统点式传感器的空间连续监测瓶颈,实现分布式连续应变测量,又能用于桥梁车流荷载信息的监控及趋势预测等,对桥梁等重大结构的健康监测具有重要意义。

In this paper, the technique of Brillouin optical time domain analysis has been applied to the bridge. By laying optical sensing fiber cables, the total strain distribution along the bridge has been obtained. We also compare the experimental result with traditional sensors by load test and long-term strain monitoring. The result shows that this technique is able to overcome the problem of distributed monitoring of traditional point-based sensors, and predicts the trend of strain evolution, which makes it a highly competitive candidate for future structural healthy monitoring.