Magnetic error suppression in Polarization-Maintaining fiber optic gyro system with orthogonal polarization states

Li, Jing; Zhou, Yanru; Xue, Luyao; Liu, Wenyao; Xing, Enbo; Tang, Jun; Li, Jun

doi:10.1016/j.yofte.2022.102927

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Usually, we think that I 0 is a constant. However, the LSP certainly fluctuates when the working environment of the gyroscope changes [ 19 , 20 , 21 ]. In addition, in the process of miniaturization and cost reduction, the light source and its drive circuit might be simplified, compromising the stability of the light source.…”

Section: Analysis and Simulationmentioning

confidence: 99%

A Novel Closed-Loop Control to Solve Light Source Power Fluctuations in the Fiber-Optic Gyroscope

Zheng

Ren

Luo

et al. 2023

Sensors

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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.

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Section: Analysis and Simulationmentioning

confidence: 99%

A Novel Closed-Loop Control to Solve Light Source Power Fluctuations in the Fiber-Optic Gyroscope

Zheng

Ren

Luo

et al. 2023

Sensors

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show abstract

“…Such fluctuations are closely related to the working environment. Even small changes in temperature, air pressure, electromagnetic field, and the power system lead inevitably to fluctuations in SLD light-source power [ 16 , 17 , 18 ]. When SLD power fluctuates, there are deviations in IFOG SLD power in the first and second half-cycles, and these small errors gradually accumulate in the process of closed-loop control until their impact is non-negligible.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Compensation for SLD Light-Power Fluctuation in an Interferometric Fiber-Optic Gyroscope

Zheng

Ren

Luo

et al. 2023

Sensors

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An interferometric fiber-optic gyroscope (IFOG) demodulates a rotation signal via interferometric light intensity. However, the working environments of IFOGs typically involve great uncertainty. Fluctuations in temperature, air pressure, electromagnetic field, and the power system all cause the power of the superluminescent diode (SLD) light source to fluctuate as well. In this invited paper, we studied the effects of SLD power fluctuation on the dynamic and static performance characteristics of a gyro system through the use of a light-power feedback loop. Fluctuations of 0.5 mA, 1 mA, and 5 mA in the SLD source entering the IFOG caused zero-bias stability to be 69, 135, and 679 times worse. We established an effective method to monitor power fluctuations of SLD light sources and to compensate for their effects without increasing hardware complexity or system cost. In brief, we established a real-time power-sensing and -compensating system. Experimental results showed that for every 0.1 mA increase in the fluctuation amplitude of the driving current, the zero-bias stability became 4 to 7 times worse, which could be reduced about 95% through the use of SLD power compensation.

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The Third Closed-Loop Control for Compensating Light Power Fluctuations in the Interferometric Fiber-Optic Gyroscope

et al. 2023

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Magnetic error suppression in Polarization-Maintaining fiber optic gyro system with orthogonal polarization states

Cited by 5 publications

References 22 publications

A Novel Closed-Loop Control to Solve Light Source Power Fluctuations in the Fiber-Optic Gyroscope

A Novel Closed-Loop Control to Solve Light Source Power Fluctuations in the Fiber-Optic Gyroscope

Real-Time Compensation for SLD Light-Power Fluctuation in an Interferometric Fiber-Optic Gyroscope

The Third Closed-Loop Control for Compensating Light Power Fluctuations in the Interferometric Fiber-Optic Gyroscope

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