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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 inclinometer tube based on FBG sensing technology are introduced. A new temperature compensation method of FBG sensor is proposed based on the characteristics of the inclinometer tube. The strain transfer rate of fiber Bragg grating sensor was calculated by two methods of finite element simulation and theoretical analysis. The influence of the bonding length and thickness on the strain transmissibility was compared and analyzed. The new optical fiber grating inclinometer tube was buried at a slope of Guanghan expressway and its monitoring results were compared with that of the traditional inclinometer buried in the same position. The accuracy of the inclinometer method was verified High, good anti-interference, digital, high degree of automation.