FBG传感技术在大坝安全监测中的应用研究

Study on Application of FBG Sensing Technology for Dam Safety Monitoring

在阐述光纤布喇格光栅 (FBG)传感器工作原理的基础上 ,研究了光纤光栅传感器在混凝土结构中的埋设技术。通过对混凝土结构施加载荷 ,探讨了光纤光栅传感器对混凝土结构内部应力应变变化的监测技术 ,并与振弦式应变传感器的监测结果进行了对比分析。结果表明 :FBG传感器具有更高的精度和灵敏度 ,可实现绝对数值测量 ,抗干扰能力强 ,结构简单 ,长期稳定性好 ,能实现实时、在线监测。该技术在大坝安全监测方面具有广泛的应用前景。

The embedding technology of the FBG sensor in concrete structure has been studied based on FBG sensing principle. The monitoring technology of FBG sensor for the changes of the stress and strain within the concrete structure under the applied load and the comparative experiment of the FBG senor and the common vibrating wires sensors in concrete beam have been investigated. The results show that the FBG sensors, which can realize a real-time and on-line monitoring, have higher measurement accuracy, better interference resistance,long-term stability and simple structure. Thus, the FBG sensor has an extensive prospect in dam safety engineering.