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谐振型光纤陀螺(RFOG)因具有敏感光纤短和体积小等优点而备受关注。分析了激光线宽、光纤环形谐振腔(FRR)及检测技术对RFOG灵敏度的影响。依据RFOG信号检测方法,推导了受光电检测器灵敏度限制的RFOG灵敏度公式,并给出了考虑激光线宽和腔内偏振轴90°旋转的RFOG灵敏度修正公式。基于多光束干涉原理,分析了数字调相电压的误差和噪声对灵敏度的影响。仿真结果表明,为获得高灵敏度,针对不同的激光线宽应选取不同的FRR腔长,偏振轴90°旋转熔接的两边长度差应为保偏光纤半拍长的奇数倍,数字调相电压的噪声方均根值应小于0.22V。该工作为高精度RFOG的设计提供了理论指导。
Resonant Fiber Optic Gyro (RFOG) due to the advantages of short sensitive fiber and small size, and much attention. The effects of laser linewidth, fiber ring resonator (FRR) and detection technology on RFOG sensitivity were analyzed. Based on the RFOG signal detection method, the RFOG sensitivity formula which is limited by the sensitivity of the photodetector is deduced. The RFOG sensitivity correction formula considering the laser linewidth and the 90 ° rotation of the in-cavity polarization axis is given. Based on the principle of multi-beam interference, the influence of the error of the digital phase-modulation voltage and the sensitivity of the noise on the sensitivity is analyzed. The simulation results show that in order to obtain high sensitivity, different lengths of FRR should be chosen for different laser linewidths. The length difference between the two sides of the 90 ° rotating polarization axis should be an odd multiple of half the length of polarization maintaining fiber, The rms value of noise should be less than 0.22V. This work provides theoretical guidance for the design of high-precision RFOGs.