光纤布拉格光栅渗压传感器设计

The design of FBG seepage pressure sensor

为实现对尾矿库的安全渗压实时监测,设计了一种波纹膜片结构封装的光纤布拉格光栅渗压传感器,通过材料及温度光栅双温度补偿,剔除了环境温度的影响。实测结果表明,该光纤光栅传感器量程为0~20 k Pa,压力灵敏度为27.8 pm/k Pa,线性拟合度达到0.999 99,适用于液位小范围变化的高精度检测。在尾矿库浸润线检测中的应用表明,传感器精度高,重复性好。

In order to realizing the real-time monitoring of the seepage pressure of the tailing pond, a kind of corrugated diaphragm based optical FBG seepage pressure sensor was designed. The influence of the ambient temperature was eliminated by the double temperature compensation of the material and temperature grating. The experimental results show that the pressure measuring range is O-20 kPa, the pressure sensitivity is 27.8 nm/MPa, the linearity-fitted is up to O. 999 99, which is suitable to high accurate measurement of the liquid level changes within narrow range, The application of the sensor in the detection of saturation line of tailing pond shows that the sensor possesses the advantages of high precision and good repeatability.