Optimization Design of Fiber Parameters in Reflective Fiber-optic Vibration Sensor

In this paper the mechanism of reflective fiber-optic vibration sensor has been researched by mathematical modeling and Simulation. Research shows that fiber structure, the numerical aperture and core diameter of fiber, can affect the performance of RIM-FOS. With the increase of the numerical aperture, the peak point and range of detection move forward, received power is not changed, sensitivity is improved; with the increase of core diameter of transmitting fiber, power peak and sensitivity decreases; along with the core diameter of receiving fiber increases, the peak power increases, the slope before sensitivity increased. According to the research results, the best SNR is obtained in an experimental system that the 62.5 mu m of transmitting fiber and 100 mu m core diameter of receiving fiber is adopted.