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谐振式光纤陀螺(R-FOG)是新一代惯性旋转传感器的代表。在陀螺系统中,信号检测系统占有非常重要的地位,其检测精度的大小直接影响陀螺的分辨率,而解调曲线的优化能够进一步提高检测系统的灵敏度。利用贝塞尔函数展开和光波场叠加的方法分析了谐振式光纤陀螺调相检测系统解调输出信号与谐振频率偏差之间的关系,系统采用的是带有铌酸锂相位调制器的相位谱检测技术。根据解调输出信号的解析表达式,通过数值计算,分析了解调曲线的变化规律,得到了施加在铌酸锂相位调制器上调制波形的最佳调制系数和相应的最佳调制频率范围,并进一步用实验系统验证了上述分析结果。
Resonant Fiber Optic Gyro (R-FOG) is a new generation of inertial rotation sensor representative. In the gyroscope system, the signal detection system occupies a very important position, the detection accuracy of the size of a direct impact on the resolution of the gyroscope, and the demodulation curve optimization can further improve the sensitivity of the detection system. The relationship between the demodulated output signal and the resonance frequency deviation of resonant fiber optic gyro phase modulation detection system is analyzed by the method of Bessel function expansion and optical wave field superposition. The system uses the phase spectrum with lithium niobate phase modulator Detection Technology. According to the analytical expression of the demodulated output signal, the variation law of the demodulation curve is analyzed by numerical calculation. The optimal modulation factor and the corresponding optimal modulation frequency range are obtained for the modulated waveform on the lithium niobate phase modulator. The results of the above analysis are further validated by the experimental system.