基于TDM的分布式光纤光栅传感网络

为有效提高光栅复用容量,提出了一种分布式光纤布拉格光栅传感网络方案,并进行了实验.方案中传感解调模块以TDM方式与多个传感通道相连通,利用传感通道选择光链路以时分复用方式实现传感解调端对多个传感通道的开关控制,以时分/波分相结合的机制对分布式传感量进行解调.在实验验证系统中,基于匹配光纤光栅解调方案下,以2.5 Hz的循环测试频率,多次测量同一FBG(fiber bragg grating)周期,测得系统的解调精度为±0.06 nm,具有较好的重复测量稳定性.结果表明,方案结构简单可行性好且具有良好的可升级扩展性.     

Novel weigh-in-motion system based on FBGs

In this weighinmotion (WIM) research, a novel fiber Bragg grating (FBG)based weighinmotion (WIM) system was introduced. The design derived from the idea using inservice bridge abutments as the weigh scale. The bridge beam was replaced by a piece of steel plate which supports the weight of the traveling vehicle. All weights would be finally transferred into the tubes where four FBGs were attached and could record the weightinduced strains by shifting their Bragg wavelengths. The system identification algorithm based on parameters estimation was initiated. Over 40ton load had been applied on the system and the experimental results showed a good repeatability and linearity. The system resolution had been achieved as low as 10 kg. Compared with other designs of fiberoptic WIM systems, this design is easy and reliable.     

基于无线传感器网络的远程结构健康监测系统研究

设计了一种基于无线传感器网络的结构健康监测系统,提出了一种结合层次拓扑结构的无线传感器网络、有线Internet网络以及无线CDMA1X网络的组网方案,并对光纤光栅传感器的特点进行了分析,加强了系统的可靠性和安全性,提高了数据传输质量,扩展了系统的应用范围。