温度补偿式光纤光栅土压力传感器

针对现有土压力传感器无法实现长期、实时监测的要求,设计了温度补偿式光纤光栅土压力传感器。选用有硬中心的平膜片作弹性元件,选用灵敏度高、体积小、质量轻、易于波分复用和组成传感网络的光纤光栅作敏感元件;同时采用了不受力光栅法进行了温度补偿。经实验测试,该传感器的灵敏度为1.5 nm/M Pa;线性度误差为0.35%;重复性为0.06%;迟滞为2.19%;静态误差为2.21%;这些指标能够满足实际工程应用要求。

Soil pressure sensor based on temperature compensation FBG

Since the present soil pressure sensors cannot be used to realize long term and real time monitoring,a temperature compensation FBG sensor is designed.Flat diaphragm with hard core is selected as elastic element,and a compact FBG with high sensitivity,wave division multiplexing and sensor network features is adopted as sensing element.Grating free of stress is used to compensate temperature.According to experiments and tests,the sensor has sensitivity of 1.5 nm/MPa,linearity error of 0.35%,repetitiveness of 0.06%,delay of 2.19% and static error of 2.21%,which meet the requirements of engineering application.