设计了一种新型的矿用光纤光栅风速传感器, 利用差压原理实现风速转化, 由波纹管、等强度悬臂梁和双光纤光栅组成差分敏感机构, 并通过算法进一步进行温度补偿, 有效克服了温度交叉敏感问题, 提高了应变测量的灵敏度。文中推导了光纤光栅中心波长变化量与风速的关系, 同时对敏感机构进行了水压模拟试验, 得到传感器敏感机构的灵敏度为0.703 pm/Pa, 与理论值具有很好的吻合度; 对风速传感器样机进行风洞试验测试, 结果表明风速在0.2~20 m/s的情况下, 传感器测量误差可基本控制在±0.3 m/s以内, 并具有良好的线性关系。

A design of mine wind speed sensor using fiber Bragg grating (FBG) was reported, which was based on differential pressure principle and differential sensitive architecture was adopted which was composed of a bellows, an equal-strength beam and two FBGs. Furthermore, an algorithm was introduced for temperature compensation. Through these methods the cross sensitivity of temperature was effectively eliminated and a high strain sensitivity was achieved. The relation between the central wavelength variation of the two FBGs and the wind speed was derived. Meanwhile, the hydraulic simulation test of sensitive architecture was carried out and the sensitivity of 0.703 pm/Pa was given, which agreed well with the theoretical value. The wind speed sensor was tested by wind tunnel and the results show that the measurement error of the sensor is within ±0.3 m/s in the range of 0.2-20 m/s, and the wind speed sensor has good linearity.