光纤陀螺正交磁漂移研究

Research on the Vertical Magnetic Drift in Fiber Optical Gyroscope

提出了与陀螺敏感环平面垂直的正交磁场作用下保偏光纤(PMF)陀螺产生非互易相位差(NPD)的理论,建立了相应的数学模型,并对该模型进行仿真分析和实验验证。正交磁致非互易相位差源于光纤的弯曲,与光纤环的直径、光纤直径、光纤长度及正交磁场大小等参数密切相关。理论、仿真和实验结果表明,光纤环尾纤与集成光学元件(IOC)尾纤0°熔接的保偏光纤陀螺的正交磁漂移在一定范围内随机分布,而45°熔接的保偏光纤陀螺的正交磁漂移比较稳定,其正交磁漂移与正交磁场大小呈线性关系。

The theory that the magnetic field vertical to the sensing coil plane may induce nonreciprocal phase difference （NPD） in polarization maintaining fiber （PMF） optical gyroscope is put forward. The corresponding mathematical model is established. Simulated analysis and experimental verification are carried out. The magnetic field error induced by vertical magnetic field in polarization maintaining fiber optical gyroscope arises from the bending of the fiber. And the error is closely related with the diameter of the optical fiber coil, fiber′s diameter, fiber′s length and the strength of the vertical magnetic field and so on. The simulation analysis and experimental result show that, as to a fiber optical gyroscope, in which the angles of the two tail fibers between the integrated optical components （IOC） and the fiber loop are 0°, and the magnetic drift is random in some range. But in which the ones are 45°, the magnetic drift is very stable and is linear to the magnitude of the vertical magnetic field.