基于等效不对称长度的光纤环温度性能评价方法

Temperature Performance Evaluation of Fiber Coil with Equivalent Asymmetric Length

将光纤环接入光纤陀螺系统,用全温零偏极差评价其温度性能是光纤环常用的评价方法。针对全温零偏极差因仅能判断光纤环温度性能而对后期应用指导作用不明显的问题,提出光纤环等效不对称长度的概念和基于此判据的光纤环温度性能评价方法。通过量化分析,明确了等效不对称长度的测试方法,验证了等效不对称长度用于评价光纤环温度性能的可行性以及该参数对应用的指导效果。实验结果显示,光纤环等效不对称长度与全温零偏极差近似线性相关,根据该参数对称性调整3只光纤陀螺,在温度变化率为1℃/min和2℃/min下测试时,其温度性能均得到明显改善。由此表明等效不对称长度不仅能准确评估光纤环温度性能,同时对光纤环应用具有较强的指导意义。

Fiber coils are generally evaluated from the aspect of their temperature performance with the full-temperature zero bias range after being connected to a fiber optic gyroscope system.However,the full-temperature zero bias range can only judge the temperature performance of fiber coils but is less effective to guide their applications.To address this problem,this paper proposes the concept of equivalent asymmetric length(EAL)of fiber coils and the way to evaluate their temperature performance based on it.With quantitative analysis,the paper determines the EAL test method and verifies the feasibility of evaluating fiber coils with EAL and the guiding effect of EAL on fiber coil applications.The results show that EAL is approximately linearly correlated with the full-temperature zero bias range,and the temperature performance of three fiber optic gyroscopes whose symmetry is tuned depending on EAL is improved significantly at a temperature change rate of 1℃/min or 2℃/min.This indicates that EAL is capable of both accurately estimating the temperature performance of fiber coils and guiding their applications.