光纤布拉格光栅传感技术在边坡监测中的应用

Application of Fiber Bragg Grating Sensing Technology in Slope Monitoring

介绍了基于光纤光栅传感技术的新型测斜管的工作原理、埋设方法及位移计算方法,并结合该测斜管特点提出了一种新的光纤光栅传感器温度补偿方法。采用有限元模拟和理论分析2种方法计算了光纤布拉格光栅传感器的应变传递率,并根据计算结果对比分析了粘贴长度与厚度对应变传递率的影响。在广陕高速某边坡埋设了该新型光纤光栅测斜管并进行了监测,将其监测结果与埋设在同一位置的传统测斜管的监测结果进行了对比分析,证实了该测斜方法精度高、抗干扰性好、数字化、自动化程度高。

The working principle, embedding method and displacement calculation method of a new type of inclinometer based on fiber Bragg grating sensing technology are introduced, and a new FBG sensor temperature compensation method is presented combining with the characteristics of this type of inclinometer. The strain transfer rate of the FBG sensor is calculated by the methods of finite element modeling and theoretical analysis, and the impact of bonding length and thickness on strain transfer rate is comparatively analysed based on the results of the two methods. This new type of inclinometer is embedded in a typical slope along Guangyuan-Shanxi expressway for monitoring. Comparing with the monitoring results obtained from conventional inclinometer at the same location, the monitoring result of this new type inclinometer shows that the new inclinometer has the advantages of high accuracy, strong anti-interference, high digitization and automation.