双圈同轴光纤束位移传感器研究

Displacement Sensor of Two-Circle Reflective Coaxial Fiber Bundle

设计了用于测量滑动轴承油膜的双圈同轴式光纤位移传感器,建立了双圈同轴光纤传感器调制函数的数学模型,并对其补偿机理进行了分析。对影响传感器特性的参数,包括接收光纤纤芯半径a0、发射光纤和接收光纤的轴间距d、光纤的最大入射角θc等进行了仿真计算和分析。结果表明,这种光纤传感器可以有效地消除因光源光强波动、表面反射率以及光纤传输损耗的改变对输出特性的影响。最后,通过分析给出了系统最终选定的设计参数。

Displacement sensor of two-circle reflective coaxial fiber bundle for measuring slide bearing of rotating machinery was designed. A mathematical model of modulation function for the fiber bundle sensor was established. The factors influencing the sensor's characters,including receiving fiber core radius a0,axis space d between the transfer fiber and the receiving fiber,the maximum entrance angle θc of the optic fiber,were simulated and analyzed. Results show that this fiber sensor can effectively eliminate influences on the output characteristics caused by power fluctuation,difference of surface reflectivity and transmission loss. At last,optimization design parameters of the system were presented.