基于Shupe系数的光纤陀螺光纤环评价方法

Evaluation Method of FOG Fiber Coil Based on Shupe Coefficient

针对当前缺乏有效的光纤环温度性能评价方法确保光纤陀螺整表全温精度的问题,搭建了光纤环温度测试系统,提出了一种光纤环评价方法。该方法不但能够评价光纤环的温度性能,而且能够反映陀螺整表的全温精度。根据测试结果,分析了基于Shupe系数的线性误差和线性补偿后的非线性误差。其中,前者代表了光纤环的温度灵敏度,后者代表了光纤环的可补偿程度,两者共同构成了光纤环的评价指标。利用该测试系统测试了数十只同一尺寸的光纤环,非线性误差小于0.022(°)/h,补偿后整表的全温零偏稳定性小于等于0.01(°)/h(-40℃~+60℃,1℃/min),为后续高精度光纤陀螺的生产提供了一定的指导。

In view of the current lack of an effective evaluation method of optic fiber coil temperature performance to ensure the full temperature accuracy of the FOG,a test system is established in this paper,which not only can validate the fiber coil,but also fully reflect the FOG’s bias stability over the full temperature range.Based on the test results,the linear and non-linear errors are deduced and analyzed.The former represents Shupe coefficient and stands for the temperature sensitivity of optic fiber coil,the latter is the residual error after compensation by a linear model and indicates the degree of compensability of fiber coil,both errors make up the evaluation index of the optic fiber coil.Using this test system,dozens of coils in the same size are tested.Experiment results show that the compensated FOG’s bias stability is less than or equal to 0.01(°)/h(-40℃~+60℃,1℃/min),when the non-linear error is less than 0.022(°)/h.It provides a certain guiding significance for the subsequent production of high precision FOG.