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谐振式光纤陀螺(R-FOG)是基于Sagnac效应产生的谐振频率差来测量旋转角速率的一种新型光学传感器。信号检测技术和系统中存在的各种噪声对系统的检测精度有着重要的影响。基于调相谱检测技术的谐振式光纤陀螺系统中,除顺时针(CW)和逆时针(CCW)光路传播的光强不均匀会引入非互易相位差,使系统出现零漂外,顺时针和逆时针光路的调制系数也会引入系统零漂。光克尔效应引入的系统零漂与系统的真实旋转在测量时是无法区分的,因此成为主要的噪声之一。通过光波场叠加原理,推导得到调相谱检测方案下的谐振式光纤陀螺系统中,光克尔效应引起的系统零漂的解析表达式。依据光克尔效应产生的零漂不随陀螺转速的改变而变化,利用简单的开环系统,对光克尔效应引入的陀螺零漂进行了测试。
Resonant Fiber Optic Gyro (R-FOG) is a new type of optical sensor that measures the angular rate of rotation based on the resonance frequency difference produced by the Sagnac effect. Signal detection techniques and systems exist in a variety of noise on the system’s detection accuracy has an important impact. In the resonant FOG system based on phase spectrum detection technology, the non-reciprocal phase difference is introduced in the optical path except clockwise and anticlockwise (CCW), which makes the system appear out-of-phase and clockwise And the modulation factor of the anticlockwise optical path will also introduce system zero drift. The zero-drift of the system introduced by the Kerr effect is indistinguishable from the real rotation of the system and therefore becomes one of the major noises. Based on the superposition principle of optical wavefield, the analytic expression of zero drift caused by optical Kerr effect in the resonant fiber optic gyroscope system under the phase detection spectrum detection scheme is deduced. The zero drift due to the Kerr effect does not change with the change of the gyroscopic speed, and the gyro zero drift introduced by the Kerr effect has been tested with a simple open-loop system.