双环形腔并联瑞利后向散射式光纤陀螺  

Two-Ring-Resonantor in Parallel Combined Rayleigh Backscattering Fiber Optic Gyroscope

作　　者：刘艳磊[1] 苑立波[1] 周爱[1] 

机构地区：[1]哈尔滨工程大学理学院,黑龙江哈尔滨150001

出　　处：《光学学报》2008年第5期846-851,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60577005)资助课题

摘　　要：基于单环后向瑞利散射式光纤陀螺原理,提出了一种双环形腔并联的瑞利后向散射式光纤陀螺仪新结构。利用两个2×2单模光纤耦合器,建立了并联双环形腔瑞利后向散射式光纤陀螺仪的理论模型,给出了信号表达式。利用优化的环长和分光比两结构参量,分析了瑞利后向散射式光纤陀螺仪信号的输出特性。选择双环的长度分别为1500m和1078m,2×2光纤耦合器的耦合系数分别为95.23%和94.88%构建了测试系统,用光时域反射计(OTDR)对不同转速所探测到的后向瑞利散射信号进行测量,验证了这种新结构的可行性。同单环后向瑞利散射式光纤陀螺仪相比,双环的采用,增加了测试的有效数据,使其更有利于识别,提高了测量转速的精度。A novel two-ring-resonantor in parallel combined Rayleigh backscattering fiber optic gyroscope （RBFOG） is proposed based on the single ring scheme. The theoretical model of the two-ring combined RBFOG is established by using two 2 × 2 fiber star coupler. The expression of detection signal intensity is deduced. The output signal characteristics are analyzed by optimizing the structure parameters of the two-ring cavity lengths and coupling ratios. The experimental system is constructed with cavity lengths of 1500 m and 1078 m at coupling ratios of 95.23% and 94.88 % respectively. Rayleigh backscattering signals are measured at different rotation rate by OTDR. Feasibility of the novel structure is validated. Compared with single-ring RBFOG, the two-ring system increases measuring effective data, and is propitious to recognize, and the measuring precision is improved.

关 键 词：传感器 光纤陀螺仪 瑞利后向散射 双环形腔 光时域反射计(OTDR) 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]