Low cost technique for improving open loop fiber optic gyroscope scale factor linearity

Medjadba, H.; Mohamed, Latifah

doi:10.1109/ictta.2006.1684718

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…Açık çevrim fiberoptik jiroskopun optik ve elektriksel bağlantılarını gösteren bağlantı şeması Şekil 1'de gösterilmiştir [9,15,16] işareti için kabul edilebilir ölçüttedir [23,24]. Geleneksel jiroskop için aynı doğrusallık ilişkisinde dinamik ölçüm aralığı ise 0-0,38 rad/s hesaplanmıştır.…”

Section: Teori̇ (Theory)unclassified

“…Ancak, sağladığı avantajlar nedeniyle bu alanda yürütülen ve günümüze kadar uzanan çalışmalarda genellikle açık çevrim ve kapalı çevrim jiroskop konfigürasyonları araştırmacıların ilgi odağı olmuştur. Bu araştırmaların ortak hedefi, jiroskop boyutlarının küçültülmesi [12,13], maliyetinin düşürülmesi [14][15][16], ölçüm hassasiyetinin ve/veya dinamik ölçüm aralığının artırılması olmuştur [17,18].…”

Section: Gi̇ri̇ş (Introduction)unclassified

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açık çevrim fiberoptik jiroskop için yeni bir açısal hız modellemesi

Navruz

Arı

Yücel

et al. 2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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 Sensitive angular velocity measurement  Extended measurement range  Cost effective fiberoptic gyroscope Fiber optic gyroscopes are optoelectronic technology products that are sensitive to angular velocity. In this study, a cost-effective open loop optical fiber gyroscope configuration is proposed, which can accurately measure the angular velocity of rotating objects. By performing a harmonic analysis of the signal at the gyroscope output, a novel angular velocity model that correlate the angular velocity of rotation with high accuracy is presented. Using this model in an open-loop fiber gyroscope, it has been shown that angular velocity can be measured at a wider measuring range with higher measurement sensitivity. Purpose: This paper has multiple purposes. The main purpose is to present a novel open loop fiber optic gyroscope design to more accurately measure the angular rotation speed in a wider measuring range. Other objectives are to perform time and frequency domain analysis of the fiberoptic gyroscope, to determine the relationship between the first and second harmonics changing with angular velocity and to develop a low cost and uncomplicated gyroscope design for experimental studies. Theory and Methods: Harmonic analysis of the gyroscope demonstrates that the 1st and 2nd harmonics show periodic changes with the circular velocity. By deriving the difference of harmonics, a highly accurate output signal associated with angular velocity and can be generated. A more precise angular velocity measurement can be performed in a wider dynamic measurement range using the obtained gyroscope signal. Analysis and testing of the presented model is simulated in Matlab software. Furthermore, the proposed fiber gyroscope system has been successfully installed to obtain real-time measurements. Results: Both the graphs generated from the simulation studies and the experimentally obtained data clearly demonstrate the gyroscopic properties overlapping each other. All results clearly show that the proposed model increases the dynamic range of the gyroscope and its sensitivity to angular velocity. In the experimental measurements performed within the 0 to 0.7 rad/s angular velocity measurement range, the smallest angular velocity that can be measured is 5.10-4 rad/s and the corresponding 1st harmonic amplitude is-93.5dB. Conclusion: The studies presented in this paper contribute to the development of a cost effective gyroscope. The proposed design method increases the measurement accuracy and range of the open loop fiberoptic gyroscope.

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Section: Teori̇ (Theory)unclassified

Section: Gi̇ri̇ş (Introduction)unclassified

açık çevrim fiberoptik jiroskop için yeni bir açısal hız modellemesi

Navruz

Arı

Yücel

et al. 2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

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“…OFOG has many advantages such as small size, low cost and fast response [ 3 , 4 ], leading to a wide range of applications in low precision weapons production, navigational systems for ships, inertial gyro-stabilized platforms and servo tracking systems [ 8 , 9 , 10 , 11 ]. Under the comprehensive effects of temperature and angular velocity, the OFOG drift is relatively small and the nonlinearity of scale factors is the main error that restricts the accuracy of its applications [ 12 , 13 ]. Researchers have worked extensively on the modeling and compensation of gyro output [ 14 , 15 , 16 , 17 , 18 ], improving the performance of OFOGs to a certain degree.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have worked extensively on the modeling and compensation of gyro output [ 14 , 15 , 16 , 17 , 18 ], improving the performance of OFOGs to a certain degree. In view of the nonlinear scale factor of OFOG, [ 13 , 19 ] presented the look-up table and piecewise compensation methods to compensate the OFOG angular velocity error. In [ 20 , 21 ] an OFOG digital demodulation method to reduce the OFOG linearization error was proposed.…”

Section: Introductionmentioning

confidence: 99%

A New Open-Loop Fiber Optic Gyro Error Compensation Method Based on Angular Velocity Error Modeling

Zhang

Guo

et al. 2015

Sensors

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With the open-loop fiber optic gyro (OFOG) model, output voltage and angular velocity can effectively compensate OFOG errors. However, the model cannot reflect the characteristics of OFOG errors well when it comes to pretty large dynamic angular velocities. This paper puts forward a modeling scheme with OFOG output voltage u and temperature T as the input variables and angular velocity error Δω as the output variable. Firstly, the angular velocity error Δω is extracted from OFOG output signals, and then the output voltage u, temperature T and angular velocity error Δω are used as the learning samples to train a Radial-Basis-Function (RBF) neural network model. Then the nonlinear mapping model over T, u and Δω is established and thus Δω can be calculated automatically to compensate OFOG errors according to T and u. The results of the experiments show that the established model can be used to compensate the nonlinear OFOG errors. The maximum, the minimum and the mean square error of OFOG angular velocity are decreased by 97.0%, 97.1% and 96.5% relative to their initial values, respectively. Compared with the direct modeling of gyro angular velocity, which we researched before, the experimental results of the compensating method proposed in this paper are further reduced by 1.6%, 1.4% and 1.2%, respectively, so the performance of this method is better than that of the direct modeling for gyro angular velocity.

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“…For this model, the following performance parameters have been analyzed: sensitivity threshold [29], dynamic range, and scale factor (SF) [30]. The values calculated (using the formulae) and estimated (by the results of the simulations) for such parameters are shown in Table 1.…”

Section: Design Of the Electronic Systemmentioning

confidence: 99%

Optoelectronic Design of a Closed-Loop Depolarized IFOG with Sinusoidal Phase Modulation for Intermediate Grade Applications

Menéndez¹

2018

Selected Topics on Optical Fiber Technologies and Applications

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A depolarized fiber optic gyroscope (DFOG) prototype with closed-loop configuration, sinusoidal-bias, and serrodyne-feedback electrooptic phase modulations was designed. A complete optoelectronic design is realized by using computational simulation tools (optical subsystem: Synopsys ® -Optsim™ software and electronic subsystem: National Instruments ® -MultiSim™ software). The design presented here includes both optical and electronic circuits, being the main innovation, is the use of an analogical integrator provided with reset and placed in the feedback of the electrooptic phase-modulation chain that produces a serrodyne-shaped voltage ramp signal for obtaining the interferometric signal phase cancellation. The performance obtained for this model (threshold sensitivity ≤0.052 /h; dynamic range = AE 78.19 /s) does reach the IFOG intermediate grade (tactical and industrial applications) and does demonstrate the suitability and reliability of simulation-based software tools for this kind of optoelectronic design.

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Low cost technique for improving open loop fiber optic gyroscope scale factor linearity

Cited by 8 publications

References 7 publications

açık çevrim fiberoptik jiroskop için yeni bir açısal hız modellemesi

açık çevrim fiberoptik jiroskop için yeni bir açısal hız modellemesi

A New Open-Loop Fiber Optic Gyro Error Compensation Method Based on Angular Velocity Error Modeling

Optoelectronic Design of a Closed-Loop Depolarized IFOG with Sinusoidal Phase Modulation for Intermediate Grade Applications

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