基于光纤环安装方式的光纤陀螺振动误差抑制方法

Suppression method of fiber optic gyroscope vibration error based on fiber coil installation

随着光纤陀螺的实用化,发现载体振动会引起光纤陀螺尤其是高精度光纤陀螺的测量误差增大,对光纤陀螺的性能指标造成不可忽视的影响。对干涉式数字闭环光纤陀螺,从弹光效应出发,分析了振动对光纤陀螺光路的影响机理,得出了振动影响下光纤环中反向传播的光信号非互易相移误差信号的表现形式,并针对此提出了通过合理安装光纤环,使光路满足互异性,来抑制振动情况下光纤陀螺输出信号噪声和漂移。实验结果表明,该方案有效降低光纤陀螺输出信号的噪声,抑制了由振动引起的陀螺漂移,使得陀螺振动误差减小了一个数量级。

With the practical application of fiber optic gyroscope,it is found that the carrier vibration would increase the measurement error of FOG,especially high-precision FOG.The carrier vibration also significantly influences the performance indicators of FOG.In this paper,the impact mechanism of vibration to all-digital closed-loop interferometric fiber optic gyroscope is analyzed based on the elastic-optic effect,and the non-reciprocal phase shift error signal forms between opposite spread optical signals in the fiber coil under the influence of vibration are obtained.It is proposed that noise and drift in FOG output signal could be suppressed through reasonably install the fiber coil.Experiment results show that the proposed method can effectively reduce the FOG output signal noise and suppress the vibration of the FOG drift.The FOG vibration error decreased one order of magnitude.