谐振式光学陀螺的快速锁频技术

摘要

Resonant optical gyroscope (R-MOG) is used to measure the rotation angular velocity of a carrier.It's resonant frequency difference signal is extremely weak.The fast and accurate frequency-locked detection technique directly determines the output stability of R-MOG.By setting up the R-MOG test system,the resonant characteristics of the fiber ring resonator (FRR) and its first-order harmonic characteristics are analyzed.A digital proportional (PI) closed-loop feedback control method is proposed to accurately lock the output frequency of the light source at the resonant frequency of the loop,the digital lock-in method is applied to the R-MOG to optimize the lock-in technique so that the lock-in of the resonant frequency at 4 000 s is achieved with stability better than 9 × 10-12.The test shows that the digital frequency-locking technology improves the sensitivity and output stability of the gyroscope,has the advantages of fastness,accuracy and wide application range,and provides a new detection method for the R-MOG with high engineering application value.%通过搭建谐振式光学陀螺(R-MOG)测试系统,对光纤环形谐振腔(FRR的谐振特性及其一次谐波特性进行分析,提出一种数字比例(PI)闭环反馈控制的方法,将光源的输出频率精确锁定在环路的谐振频率点处.采用数字锁频方式应用于R-MOG中,优化锁频技术,实现谐振频率在4 000 s的锁定,稳定度优于9×10-12.测试表明,该数字锁频技术提高了陀螺的灵敏度和输出稳定度,具有快速准确及适用范围广等优点,为R-MOG提供了新的检测方法,具有较高的工程应用价值.