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提出并研究了一种新颖的钟摆式光纤光栅(FBG)二维倾斜角传感器,其摆杆顶端采用圆锥结构,两个FBG沿着母线方向并间隔四分之一圆周粘贴在圆锥表面,摆杆下端固定一定质量的重物。在倾斜角发生变化时,圆锥表面产生的沿着母线方向梯度分布的应变场使FBG产生啁啾效应。利用功率谱平坦的宽带光源,通过监测两个FBG的反射光强变化,可实现二维倾斜传感。此外,由于光纤光栅的反射光强不随温度变化,所以该传感器的测量对温度不敏感。实验在±4°范围内测得该传感器的灵敏度为1.96μW/(°),精度为±0.125°。
A novel two-dimensional tilting angle sensor of FBG is proposed and studied. The top of the pendulum rod has a conical structure. The two FBGs are attached to the conical surface along the direction of the generatrix at a quarter of the circumference, The bottom of a fixed mass of heavy objects. When the tilt angle changes, the strain field generated by the tapered surface along the direction of the generatrix distribution causes the FBG to chirp effect. By using a broadband light source with a flat power spectrum, two-dimensional tilt sensing can be realized by monitoring the reflected light intensity changes of two FBGs. In addition, the sensor’s measurement is insensitive to temperature because the reflected light intensity of the fiber grating does not change with temperature. The sensitivity of this sensor measured at ± 4 ° was 1.96μW / (°) with an accuracy of ± 0.125 °.