光纤光栅多参数桥梁结构监测系统的研究

从土木工程应用的实际情况出发，利用光纤光栅传感器具有波长绝对编码和易于复用的特点，提出工程化同时测量温度、应变和压力的全光栅型低成本分布式传感方案。设计了基于连续波调频技术的光纤光栅多参量桥梁结构监测系统，将光频域反射复用与波分复用技术相结合，实现分布式光栅传感网络的寻址，提高了系统复用容量。实验表明：所设计的传感系统能够准确监测结构重要部位的内部应变及车流量等参数，为桥梁结构的静、动载测试提供了准确的数据，同时也为桥梁的工作状态评估和健康诊断提供了依据。

Multi-parameter monitoring system based on FBG for bridge structure

Proceeding from the practical application of civil engineering, an all-grating low-cost distributed sensing system for simultaneous measurement of temperature, strain and pressure based on the optic Bragg grating (FBG) is proposed by using the multiplexing and wavelength abslute coding features of the FBG sensor. A FBG multi-parameter monitoring system for the bridge structure was designed based on continuous wave modulation frequency technology. The address of distributed FBG sensing network was realized by combining optical frequency domain reflectometry (OFDR) with wavelength division multiplexing (WDM), and the content of multiplexing was increased. The experiments show that the system can accurately monitor the internal strain of the important parts of bridges, and provide the precision data for static and dynamic load testing of bridges.