双频率调制谐振式光纤陀螺谐振谷分裂现象研究  

Splitting Phenomenon of Resonance Dips in Two-Frequency Serrodyne Modulation R-FOG

作　　者：应迪清[1] 郑阳明[1] 马慧莲[1] 金仲和[1] 

机构地区：[1]浙江大学信息与电子工程系,杭州310027

出　　处：《传感技术学报》2007年第6期1245-1248,共4页Chinese Journal of Sensors and Actuators

基　　金：教育部"优秀青年教师资助计划"(教人司(2003)355号)

摘　　要：谐振式光纤陀螺(Resonator Fiber Optic Gyro,R-FOG)是利用光纤环形谐振腔的Sagnac效应实现对转动角速度检测的一种高精度惯性传感器件.双频率锯齿波组合调制技术可应用于谐振式光纤陀螺数字处理系统.实验发现,在基于双频率锯齿波组合调制技术的R-FOG系统中,对激光器输出光频率进行扫描时,在示波器上观察到光纤环形谐振腔的谐振曲线会分裂成两个谐振谷.利用频谱分析与光波场叠加原理相结合的方法对光纤环形谐振腔的输出光场进行了具体推导和仿真分析,并对谐振谷分裂现象的物理原因作了解释.仿真分析发现,光纤环形谐振腔的谱线宽度越窄或两个锯齿波组合调制频率相差越大,谐振谷分裂现象越明显.最后对这种谐振谷分裂现象进行了具体测试,实验测试结果和理论分析结果一致.Resonator fiber optic gyro （R-FOG） is an inertial rotation sensor with high accuracy based on the Sagnac effect. The two-frequency serrodyne modulation technique can be used in the digital R-FOG system. When the frequency of the laser is swept, the splitting phenomenon of resonance dips could be observed in the oscillator. Combining the frequency spectrum analysis and the optical field overlapping method, the output optical field of the fiber ring resonator is derived theoretically. On this basis, the physical reason for the splitting phenomenon is explained. It is found that decreasing the fiber ring resonator spectral linewidth or increasing the two serrodyne modulation frequency difference will make the splitting phenomenon of the resonance dips be more obvious. At last, the splitting phenomenon is tested by experiments, and the experiment results agree with the theoretical analysis well.

关 键 词：光电子学 谐振式光纤陀螺 双频率锯齿波组合调制 谐振谷分裂 

分 类 号：TN815[电子电信—信息与通信工程] TN911.74