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调相谱检测技术是谐振式光纤陀螺(R-FOG)角速率信号提取的关键技术,通过选取合适的调制参数,可大大提升陀螺的综合性能。利用相位调制频谱展开式,依据调相谱载波分量和调制信号的幅度关系,提出了双光路调相谱最优参数的确定方法,该方法在保证陀螺最佳灵敏度工作点的同时,有效地抑制了背向散射噪声的影响;在正弦波调相谱下,采用自外差法实测了相位调制器的半波电压,得到了调相谱载波分量与调制电压幅度的关系曲线,与理论分析相符;以长度为12 m的保偏光纤熔接环为敏感谐振腔,直径为0.15 m,耦合系数为50%,进行了不同角速率的转动测试,得到了动态范围为±480(°)/s、非线性度为3%的转动结果。
The phase spectrum detection technology is the key technology of R-FOG angular rate signal extraction. By selecting the appropriate modulation parameters, the overall performance of the gyroscope can be greatly improved. Based on the phase modulation spectrum expansion, the method of determining the optimal parameters of the dual optical phase modulation spectrum is proposed according to the amplitude relationship between the carrier component of the phase modulation spectrum and the amplitude of the modulated signal. This method can effectively restrain the optimal sensitivity operating point of the gyro The influence of backscattering noise was analyzed. The half-wave voltage of the phase modulator was measured by heterodyning method under the sinusoidal phase modulation spectrum, and the relationship between the carrier frequency and the modulation voltage amplitude was obtained, which was consistent with the theoretical analysis ; The length of 12 m polarization-maintaining fiber fusion ring as a sensitive resonator, a diameter of 0.15 m, the coupling coefficient of 50%, carried out a different angular rate of rotation test, the dynamic range of ± 480 (°) / s, Non-linearity of 3% of the rotation results.