基于光纤传感器的结构健康监测系统的研究

Investigations on the structural health monitoring system based on the optical fiber sensor

利用激光测振仪和测振控制器设计了一套“非接触”式结构健康监测系统。通过激光测振仪的非接触式光纤探头,监测悬臂梁在不受外界荷载的情况下做自由振动的运动特性。通过数据采集卡,将振动解码器解码的电压信号进行AD转换,并实时将采集的信号发送至上位机,经过Labview软件连接,实现对悬臂梁的运动状态进行实时监测,并分析是否发生损伤。结果表明:该结构健康监测系统能够准确地监测悬臂梁的振动情况并提取损伤特征,判断损伤是否发生。在预防大型建筑结构安全事故,保障人们生命财产安全方面具有使用价值。

A set of "non-contact" structural health monitoring system is designed using a laser vibration meter and vibration decoder.The non-contact optical fiber probe of the laser vibrometer is used to monitor the motion characteristics of free vibration of a cantilever beam without applying external load.In terms of the data acquisition card,the voltage signal decoded by the vibration decoder is used for AD transformation.The acquired signals are sent to the upper computer,connected using the Lab VIEW software in real time to monitor the motion state of the cantilever beam and analyze whether there is a damage occurred or not.The results show that the structural health monitoring system can accurately monitor the vibration of the cantilever beam,extract the damage characteristics and judge whether the damage occurs or not.It has potential applications in monitoring and preventing safety accidents of large-scale civil structures and ensuring the safety of people’s lives and property.