Zheng Yue, Liu Jiaqi, Chen Heyu, Li Lijing, Zhang Chunxi
Opt Express. 2019 Sep 16;27(19):27028-27038. doi: 10.1364/OE.27.027028.
The measuring accuracy of the fiber optic gyroscope (FOG) for weak signals under very short sampling time is significantly impacted by the quantization error, impeding its application in high-speed measurement and real-time control. In this work, we propose and implement a double-electrode-pair multifunction integrated-optic circuit (MIOC), which contains an additional pair of short electrodes besides the conventional electrode-pair. Taking advantage of the better modulating precision of the additional electrode-pair, the digital feedback is more refined and the quantization error in the FOG output is significantly suppressed. The driving circuits and the control scheme of the proposed MIOC are specially designed for FOGs. Experimental results show that the resolution for extremely small angular rates at short smoothing times is significantly improved. This work provides the potential of the applications in high-speed measuring and controlling systems for high-precision FOGs.
在极短采样时间下，光纤陀螺仪（FOG）对微弱信号的测量精度会受到量化误差的显著影响，这阻碍了其在高速测量和实时控制中的应用。在这项工作中，我们提出并实现了一种双电极对多功能集成光路（MIOC），它除了传统电极对外还包含一对额外的短电极。利用额外电极对更好的调制精度，数字反馈更加精细，并且FOG输出中的量化误差得到了显著抑制。所提出的MIOC的驱动电路和控制方案是专门为FOG设计的。实验结果表明，在短平滑时间下，对极小角速率的分辨率有显著提高。这项工作为高精度FOG在高速测量和控制系统中的应用提供了潜力。
