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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
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
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)
sensor
fiber optic gyroscope
Rayleigh backscattering
two-ring-resonators
optical time domain reflectometer （OTDR）
