反射式横向位移光纤传感器特性

Characteristics of the Reflective Fiber Optical Sensor for Measuring Transverse Displacement

在实验测量的基础上形成了一种在高斯光束几何反射模型下的一维数值计算方法,可以在计算机上对反射式横向位移光纤传感器的特性进行计算分析,为该传感器的优化设计提供了一个必要工具.对用62.5/125多模光纤组成的并列反射式横向位移光纤传感器的计算分析结果表明:接收光纤端面处的反射光斑半径在180μm附近时有最大的接收光强和最佳信噪比;反射光斑半径在180μm^600μm时接收光强对反射条边缘的横向位移或横向振动的动态范围、线性关系和信噪比都较佳;接收光强对反射条横向位移的分布宽度主要取决于反射条的宽度和接收光纤的芯径.

In order to study the design method of reflective fiber optical sensor, a one-dimension integrating formula derived from the reflection of Gaussian beam and experimental results has been given. That formula can be used to calculate the reflection intensity characteristics of optical fiber sensor rapidly on the personal computer for the purpose of optimizing the sensor design. The calculating results of reflective optical fiber sensor made up of 62.5/125 multimode optical fiber show that the sensor has the maximum receiving power and optimal signal-to-noise ratio when the reflection beam width on the receiving fiber face is 180 μm, that the widest variation range and the best linearity relation for the receiving power vs. reflector＇s transverse displacement can be reached with the beam width on the receiving fiber face is among 180 μm～600μm, and that the distribution width of receiving power is decided by the reflector＇s width and the core diameter of receiving fiber.