Institute of Laser & Micro/Nano Engineering, College of Electronics & Information Engineering, Sichuan University, Chengdu 610065, China.
Sensors (Basel). 2023 May 9;23(10):4590. doi: 10.3390/s23104590.
The performance of a gyroscope is directly affected by the fluctuations in the light source power (LSP) in an interferometric fiber-optic gyroscope (IFOG). Therefore, it is important to compensate for fluctuations in the LSP. When the feedback phase generated by the step wave completely cancels the Sagnac phase in real-time, the error signal of the gyroscope is linearly related to the differential signal of the LSP, otherwise, the error signal of the gyroscope is uncertain. Herein, we present two compensation methods to compensate for the error of the gyroscope when the error is uncertain, which are double period modulation (DPM) and triple period modulation (TPM). Compared with the TPM, DPM has better performance, but it increases the requirements for the circuit. TPM has lower requirements for the circuit and is more suitable for small fiber- coil applications. The experimental results show that, when the frequency of the LSP fluctuation is relatively low (1 kHz and 2 kHz), DPM and TPM do not differ significantly in terms of performance; both of them can achieve an improvement of about 95% in bias stability. When the frequency of the LSP fluctuation is relatively high (4 kHz, 8 kHz and 16 kHz), DPM and TPM can achieve about 95% and 88% improvement in bias stability, respectively.
陀螺仪的性能会受到干涉型光纤陀螺仪（IFOG）中光源功率（LSP）波动的直接影响。因此，补偿 LSP 波动非常重要。当阶跃波产生的反馈相位实时完全抵消萨格纳克相位时，陀螺仪的误差信号与 LSP 的差分信号呈线性关系，否则，陀螺仪的误差信号是不确定的。在此，我们提出了两种补偿方法来补偿陀螺仪在误差不确定时的误差，分别是双周期调制（DPM）和三周期调制（TPM）。与 TPM 相比，DPM 具有更好的性能，但会增加对电路的要求。TPM 对电路的要求较低，更适用于小光纤线圈应用。实验结果表明，当 LSP 波动频率较低（1 kHz 和 2 kHz）时，DPM 和 TPM 在性能上没有明显差异；它们都可以将偏置稳定性提高约 95%。当 LSP 波动频率较高（4 kHz、8 kHz 和 16 kHz）时，DPM 和 TPM 分别可以将偏置稳定性提高约 95%和 88%。
