Suppression of backscattering-induced noise in a resonator optic gyro by the dual-frequency modulation method
Suppression of backscattering-induced noise in a resonator optic gyro by the dual-frequency modulation method
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DOI：
10.1016/j.optcom.2019.124766
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发表时间：
2020-03
影响因子：
2.4
通讯作者：
Haoyu Wang;Wenyao Liu;Ziwen Pan;Yu Tao;J. Niu;Jun Tang;Jun Liu
中科院分区：
文献类型：
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作者：
Haoyu Wang;Wenyao Liu;Ziwen Pan;Yu Tao;J. Niu;Jun Tang;Jun Liu
后向散射噪声是影响谐振式光学陀螺精度的主要噪声之一。提出了一种利用双频调制技术抑制ROG后向散射噪声的方法。在获得Sagnac频差的前提下，增大前后向波束之间的频率间隔。其中，锁频电路采用高频调制，输出通道采用低频调制，调制后的光学元件具有一定的频率差。首先，通过高低频调制增大顺时针光路和逆时针光路之间的频率差，提高载波抑制比，抑制后向散射和信号光产生的噪声。然后，带通滤波被用来消除由后向散射本身引起的噪声。通过理论分析和实验验证了该方案的可行性和有效性。该方法有效地提高了陀螺的输出精度，陀螺的最终输出达到0.0054 μ s/s（10 s积分时间）。
Backscattering noise is one of the main noises affecting the accuracy of resonant optical gyroscope (ROG) systems. A method of suppressing backscattering noise in a ROG is demonstrated using a dual frequency modulation technique. On the premise of obtaining the Sagnac frequency difference, the frequency interval between the forward and backward beams is increased. Among them, high frequency modulation is used in the frequency-locked circuit, low-frequency modulation is used in the output path and the modulated optical components have a certain frequency difference. Firstly, the frequency difference between the clockwise and counterclockwise optical paths is increased by high and low frequency modulation to increase the carrier rejection ratio, and the noise generated by backscattering and signal light is suppressed. Then, bandpass filtering is used to eliminate the noise caused by the backscattering itself. Through theoretical analysis and experiment, the feasibility and effectiveness of the scheme are verified. The method effectively improves the output precision of the gyro, and the final output of the gyroscope reaches 0.0054∘/s (10 s integration time).