谐振式光学陀螺的两种相位调制波形比较研究

调相谱技术在谐振式光学陀螺信号检测过程非常重要,其中调相波形的选择在抑制光电噪声、实现高精度锁频尤为关键。理论分析了正弦波与三角波信号的调制及光电检测机理。设计并搭建光学平台,对双路谐振式光学陀螺分别采用这两种信号进行调制,得到了两路信号的锁频精度及输出精度。最后分析对比了采用正弦波与三角波信号调制的实验结果:采用正弦波调制的效果优于三角波一倍以上,可以有效解决三角波调制过程存在的瞬态响应噪声;为谐振式光学陀螺进一步调相集成提供理论及实验支撑。

Comparison of Two Phase Modulation Waveforms in Resonant Optical Gyroscope

Phase modulation spectroscopy in the resonant optical gyroscope signal detection process is very important, the choice of phase modulation waveform is particularly critical in suppressing photoelectric noise and achieving high-precision frequency locking. The modulation and photoelectric detection mechanism of sine and triangular wave signals are analyzed theoretically, and the optical platform is designed and constructed. Furthermore, the two signals are modulated by two-way resonant optical gyroscope, and the frequency locking accuracy and output precision are obtained. Finally, the experimental results of sine wave and triangular wave signal modulation are analyzed and compared: the modulation effect of sine wave is better than that of triangular wave, which can effectively solve the transient response noise of triangular wave modulation. It can provide theoretical and experimental support for further phase modulation integration of resonant optical gyroscope.