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为了监测地壳内部的微应力应变,设计了一种基于光纤布拉格光栅(FBG)的钻孔应变传感器。结合FBG的传感原理,通过有限元分析,构建出曲边三角形的传感应变结构,并根据其传感特点进行相应的封装。使用参考光栅法,在应变片上粘贴两支FBG,在一支FBG测量应变的同时另一支FBG对其进行温度补偿,解决了FBG对温度和应变同时敏感的问题。为了模拟传感器在钻孔中的环境,建立了微应变测试平台。实验结果表明,研制的钻孔应变传感器的灵敏度为0.092 3pm/με,且具有较大的增敏空间。
In order to monitor the micro-stress strain in the crust, a borehole strain sensor based on Fiber Bragg Grating (FBG) was designed. Combined with the sensing principle of FBG, the sensing strain structure of curved triangle is constructed through finite element analysis, and the corresponding package is made according to the sensing characteristics. Using the reference grating method, two FBGs are attached to the strain gage. When one FBG measures the strain, another FBG compensates for the temperature. This solves the problem that the FBG is sensitive to temperature and strain at the same time. In order to simulate the sensor in the drilling environment, a micro-strain testing platform was established. The experimental results show that the sensitivity of the drilled hole strain sensor is 0.092 3 pm / με, and has a larger sensitization space.