为了研究基于两光斑旋转的光纤传感器对温度变化的灵敏性,设计了一种基于光斑旋转角度调制的新型光纤传感系统。在一根光纤上绕制2个光纤环,通过改变光纤环1的直径使光纤发生宏弯损耗获得2个光斑,将光纤环2置于水温控制箱中,观察温度的变化与出射光斑发生旋转的关系。为了更好地对比,还观察了温度变化与三光斑角度旋转的关系。通过对光纤宏弯损耗及光纤环耦合原理的分析,利用MATLAB对实验数据进行处理,得出了两光斑光纤传感器具有温度稳定性的结论。

In order to research the temperature sensitivity of optical fiber sensor based on two faculae rotation,a new optical fiber sensor system based on the monitoring of facula rotation angle is designed.Firstly,one fiber is coiled into two fiber loops (Loop 1 and Loop 2).Then the radius of the Loop 1 is changed to incur macros bending loss and two faculae is realized.Meanwhile,Loop 2 is put into water temperature monitor box and temperature changes are observed relate to facula rotation angles.The experiment also shows how temperature changes relate to three faculae rotation angles for comparison.Finally,the principle of optical fiber macros bending loss and fiber optic ring coupling is analyzed.MATLAB is used to process the collected data of the experiments and the result shows that two faculae optical sensor is thermally stable.