Modeling of Rate Error in Interferometric Fiber-Optic Gyroscopes Due to Stress Induced by Moisture Diffusion

Webber, Matthew; Willig, R.; Rackowski, H.; Dineen, Andrew

doi:10.1109/jlt.2012.2198045

Cited by 25 publications

(7 citation statements)

References 17 publications

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“…, p 12 and p 11 are the photoelastic coefficients of the fiber glass, andε f anḋ ε p are the time derivatives of the strain fields through the fiber propagation axis and the perpendicular axis inside the fiber core, respectively. The strain change can be induced by the temperature fluctuation [9][10][11][12][13][14], the vibration [15], or the change of the moisture level inside the fiber [16]. The two bias error mechanisms are additive and the total bias error is…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Thermally induced bias error due to strain inhomogeneity through the fiber optic gyroscope coil

2020

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One of the performance limits of a navigation grade fiber optic gyroscope is the bias error due to the thermal sensitivity of the fiber coil. Thermal stress inside the fiber coil is an important source of the bias error. The reduction of the total stress inside the fiber coil can be limited. In this paper, it is shown that further improvement can be achieved by controlling the strain inhomogeneity through the fiber coil. A validated simulation environment is presented for strain distribution analysis. Thermally induced bias error formation mechanisms are compared. The effect of the strain inhomogeneity is reduced by presenting a different coil cross section and spool material. Experiments utilizing a coil design with better performance are presented for the verification of the approach.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Thermally induced bias error due to strain inhomogeneity through the fiber optic gyroscope coil

2020

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“…In the FOC winding process, additional stress brought to the optical fiber will change the light propagation state and affect the output stability [3]. Therefore, during FOC The associate editor coordinating the review of this manuscript and approving it for publication was Valentina E. Balas .…”

Section: Introductionmentioning

confidence: 99%

Constant Small Tension Control for Fiber Optic Coil Variable-Velocity Winding

Yang

Guo

2019

IEEE Access

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Fiber Optic Gyroscope (FOG) is a new type of rotation sensor that plays an important role in navigation and guidance system. As the sense element of FOG, the fiber coil (FOC) performance directly affects the FOG measurement precision. Many factors influence the quality of FOC, ideal structure and constant small tension control in the winding process were key factors. In order to prevent FOC edge defect, we proposed piecewise variable speed winding method to make regular FOC structure more accessible. In view of the shortage of the common control method used in FOC winding, we optimized fuzzy PID by introducing domain adjusting factors and designed a new tension controller based on mechanical analysis. The optimization controller can adaptively adjust the control factors to ideal settings and ensure constant tension throughout all variable winding speeds stages even in the present of complex external disturbance. Comparative experiments shown that the new controller has a higher accuracy and better robustness than commonly used controller.

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“…To improve the thermal performance of the fiber-optic gyroscope, the approach of using air-core photonic-bandgap fiber is present in [ 7 ] and it is demonstrated by experiments in [ 8 ] that the thermal sensitivity is 6.5 times less than the conventional fiber coil. Furthermore, modeling for rate errors of IFOG induced by moisture diffusion is present in [ 9 ]. In practical applications for high precision IFOG, mechanical vibration is a common and inevitable environmental factor that typically encountered in the inertial navigation platforms, and it will degrade the performance of the gyroscope seriously.…”

Section: Introductionmentioning

confidence: 99%

Modeling for IFOG Vibration Error Based on the Strain Distribution of Quadrupolar Fiber Coil

Gao

Zhang

2016

Sensors

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Improving the performance of interferometric fiber optic gyroscope (IFOG) in harsh environment, especially in vibrational environment, is necessary for its practical applications. This paper presents a mathematical model for IFOG to theoretically compute the short-term rate errors caused by mechanical vibration. The computational procedures are mainly based on the strain distribution of quadrupolar fiber coil measured by stress analyzer. The definition of asymmetry of strain distribution (ASD) is given in the paper to evaluate the winding quality of the coil. The established model reveals that the high ASD and the variable fiber elastic modulus in large strain situation are two dominant reasons that give rise to nonreciprocity phase shift in IFOG under vibration. Furthermore, theoretical analysis and computational results indicate that vibration errors of both open-loop and closed-loop IFOG increase with the raise of vibrational amplitude, vibrational frequency and ASD. Finally, an estimation of vibration-induced IFOG errors in aircraft is done according to the proposed model. Our work is meaningful in designing IFOG coils to achieve a better anti-vibration performance.

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Modeling of Rate Error in Interferometric Fiber-Optic Gyroscopes Due to Stress Induced by Moisture Diffusion

Cited by 25 publications

References 17 publications

Thermally induced bias error due to strain inhomogeneity through the fiber optic gyroscope coil

Thermally induced bias error due to strain inhomogeneity through the fiber optic gyroscope coil

Constant Small Tension Control for Fiber Optic Coil Variable-Velocity Winding

Modeling for IFOG Vibration Error Based on the Strain Distribution of Quadrupolar Fiber Coil

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