谐振式光纤陀螺偏振波动噪声的温度特性

光纤环形谐振腔环境温度变化带来的偏振波动噪声是影响谐振式光纤陀螺检测精度的主要光学噪声源之一,通过控制谐振腔温度,可以使偏振波动噪声得到有效抑制.为了抑制偏振波动噪声,减小R-FOG精度受FRR温度变化的影响,从理论上分析了谐振腔温度变化对谐振曲线、解调曲线的影响;针对不同温度下光纤环的谐振特性、解调曲线特性、陀螺零偏及零偏稳定性开展了实验,并对实验结果进行了分析.结果表明,谐振腔的工作温度为27.00℃时,两本征偏振态相距最远,总谐振曲线关于谐振频率点对称,谐振频率点检测误差可以忽略;陀螺零偏稳定性近似等于谐振腔温度为25.50℃时的1/100,在150 s的采样时间内达到0.07°/s,陀螺检测精度得到很大提高.

Temperature characteristics of polarization fluctuation noise in resonator fiber optic gyroscope

Polarization fluctuation owing to temperature variations of the fiber ring resonator(FRR)is one of the main optical noises,which seriously affects detection accuracy of resonator fiber optic gyroscope,it can be effectively sup?pressed by controlling temperature of resonator. In order to suppress polarization fluctuation to reduce the deteriora?tion of R-FOG accuracy caused by temperature changes of FRR,the effect of temperature variations on resonance curve and demodulation curve were theoretically analyzed in this paper. Experiments to research resonant character?istics and demodulation curve features and zero bias and zero bias stability at the gyro output were carried out under different temperatures,and experimental results were analyzed. Results show that by controlling the temperature around the fiber ring resonator to 27.00℃,phase separation between the unwanted resonance and the desired reso?nance achieves farthest,the desired resonance is primly symmetrical about the resonant frequency point,slope of the linear region on demodulation curve reaches its maximum,detection error of resonant frequency can be ignored in this state;a zero bias stability of 0.07 °/s of gyro is obtained in sampling time of 150 s,which is almost 100 times small than that when the temperature of resonantor is 25.50℃,detection accuracy of gyro is markedly improved.