关键词: 光纤布拉格光栅, 高精度, 压力传感器, 温度补偿

Abstract:

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 0~20 kPa, the pressure sensitivity is 27.8 nm/MPa, the linearityfitted is up to 0. 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.

Key words: FBG, sensitivity, temperature compensation, pressure sensor