Application of a novel spatial non-reciprocal phase modulator in fiber optic gyroscope

Qi, Yuefeng; Zhang, Xin; Wang, Yantao; Wang, Mingjun; Liu, Zimeng; Gong, Chenbo; Liu, Yanyan

doi:10.1016/j.yofte.2020.102258

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…In a miniature fiber-optic gyroscope, the length of the fiber coil is very short, only 100–200 m. The time it takes for the light to pass through the fiber coil is also very short, perhaps less than 1 μs. The DPM method requires the division of a period into several parts, which greatly increases the requirements for the circuit and may significantly affect the performance of the gyroscope [ 24 ]. Therefore, we use the method of TPM.…”

Section: Principle Of the Compensation Methodsmentioning

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: Principle Of the Compensation Methodsmentioning

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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“…Optical current sensor can be divided into all-fiber current sensor and magneto-optical current sensor according to different sensing units. The all-fiber cur-rent sensor [2][3][4] uses optical fiber as the sensing medium, improving the antiinterference ability. However, the Verdet constant of ordinary quartz optical fiber is low, and the Faraday magneto-optical rotation effect produced by it is weak.…”

Section: Introductionmentioning

confidence: 99%

Current measurement method based on integral reconstruction of magnetic rotation angle

Shui¹,

Rong²,

Dong³

et al. 2023

IJE

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In view of the nonlinear limitation of the sine function on the magnetic rotation angle in the optical current sensor based on the light intensity detection mode, this paper proposes a current measurement method based on the integral reconstruction of the magnetic rotation angle, thus avoiding the large current measurement error caused by the approximate linear measurement of the magnetic rotation angle. In this method, the cosine term in the derivative of the sine signal containing the magnetic rotation angle is eliminated by the constant deformation of the trigonometric function, and then the magnetic rotation angle is reconstructed by integration. The experimental results show that within the current range of 0.20 Arms to 2.40 Arms, the measurement error of the current value of the integral reconstruction method is less than 1.30%, the measurement error is less than the approximate linear measurement method, and there is a good linear relationship between the magnetic rotation angle and the current, with a linearity of 99.987%.

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“…Yuefeng Qi et al employed a new phase modulator that can simultaneously modulate the light waves transmitted in two different directions, which overcomes the modulation of traditional Y-waveguide phase modulator disadvantages of intrinsic frequency limitation. The research on the new phase modulator has made incremental progress but is still in the conceptual and laboratory stages [9]. Hence, there is a need to investigate high-precision methods for measuring the intrinsic frequency of fiber optic gyroscopes [10].…”

Section: Introductionmentioning

confidence: 99%

“…They changed the phase modulation waveform to a sawtooth wave, where the modulation error reflects the degree of deviation of the sawtooth wave modulation frequency from an even multiple of the intrinsic frequency. By adjusting the sawtooth wave frequency based on the modulation error and achieving zero modulation error, the frequency of the sawtooth wave signal becomes an even multiple of the intrinsic frequency, achieving a measurement accuracy of 1 Hz [9]. However, these intrinsic frequency measurement methods have relatively low efficiency and are susceptible to various interference sources in the optical and electrical paths, making it challenging to provide high measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Automatic Detection of Fiber Optic Gyroscope Intrinsic Frequency Based on Optimal Projection Approximation

Xu,

Tian

2023

Photonics

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To address the complexity and low detection accuracy issues in the intrinsic frequency detection process of fiber optic gyroscopes, a highly precise automatic measurement method based on optimal projection approximation is proposed. Building upon the digital closed-loop fiber optic gyroscope hardware circuit, this method generates a frequency-adjustable square wave with a 25% duty cycle through field-programmable gate array (FPGA) fractional division. Subsequently, it calculates the difference between the high and low levels of the sign bits of the modulated optical intensity signal sampled by the analog-to-digital converter (ADC). This yields an error signal related to the modulation frequency and intrinsic frequency. The modulation frequency is then approximated using the nearest projection of this error signal, thereby achieving automatic detection of the fiber optic gyroscope’s intrinsic frequency. The experimental results indicate that this method, requiring no external auxiliary equipment, enables rapid and highly accurate measurement of the intrinsic frequency of the fiber optic gyroscope. The measurement of intrinsic frequency takes approximately 300 milliseconds, achieving a measurement accuracy of up to 0.001 Hz.

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Application of a novel spatial non-reciprocal phase modulator in fiber optic gyroscope

Cited by 9 publications

References 17 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

Current measurement method based on integral reconstruction of magnetic rotation angle

Automatic Detection of Fiber Optic Gyroscope Intrinsic Frequency Based on Optimal Projection Approximation

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