Investigation of the effects of temporal thermal gradients in fiber optic gyroscope sensing coils, part 2

Lofts, Cassie M.; Ruffin, Paul; Parker, Mike; Sung, C. C.

doi:10.1117/1.601188

Cited by 18 publications

(4 citation statements)

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“…The effects of the different types of optical noise [37][38][39][40][41][42][43][44][45][46][47][48][49][50] which take place are not critical in the specific design of this sensor, since its operation works in a medium level of optical-power and the signal-to-noise-ratio (SNR) is relatively high at photodetector's optical-input (SNR > 100 dB).…”

Section: Discussion Of Simulation Resultsmentioning

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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Section: Discussion Of Simulation Resultsmentioning

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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“…With the origin of the coordinate located at the fiber coil midpoint s = L/2 (L is the total fiber length), the nonreciprocal phase shift e ϕ ∆ induced by the Shupe effect in the singlemode fiber can be expressed as [12][13][14]:…”

Section: Pointing Error Caused By Time-dependent Radial Thermal Gradientmentioning

confidence: 99%

A novel method for determining and improving the quality of a quadrupolar fiber gyro coil under temperature variations

Li¹,

Zhang²,

Liu³

et al. 2013

Opt. Express

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We introduce a parameter called pointing error thermal sensitivity (PETS) for quantitatively determining the quality of a quadrupolar (QAD) fiber coil under radial temperature variations. We show both analytically and experimentally that the pointing error of a fiber gyro incorporating the fiber coil is linearly proportional to the final radial thermal gradient on the coil, with PETS as the proportional constant. We further show that PETS is linearly proportional to another parameter called effective asymmetric length of the coil. By thermally inducing different radial thermal gradients on the fiber coil and measuring the corresponding pointing errors in a gyroscopic measurement setup, we can confidently determine the PETS of the fiber coil and its associated effective asymmetric length caused by imperfections in coil winding. Consequently, we are able to precisely trim the coil to achieve best thermal performance.

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“…Owing to the thermal deformation itself, the drift of FOG is sensitive to environmental temperature variation and temperature related drift has become a main source of error affecting the performance of FOG in engineering application [3,4]. At present, there are two main methods to avoid temperature drift error: one is employing machining techniques and experimental approaches to control temperature [5][6][7][8]; the other is modeling compensation method [3,4,9,10]. The temperature control method has a disadvantage of increasing weight and cost, so there will be a certain amount of restraint in the application.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Wavelet Threshold Denoising Method for Environmental Drift of Fiber Optic Gyro

Zhang¹,

Wang

Gao³

et al. 2016

Mathematical Problems in Engineering

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Fiber optic gyroscope (FOG) is a core component in modern inertial technology. However, the precision and performance of FOG will be degraded by environmental drift, especially in complex temperature environment. As the modeling performance is affected by the noises in the output data of FOG, an improved wavelet threshold value based on Allan variance and Classical variance is proposed for discrete wavelet analysis to decompose the temperature drift trend item and noise items. Firstly, the relationship of Allan variance and Classical variance is introduced by analyzing the drawback of traditional wavelet threshold. Secondly, an improved threshold is put forward based on Allan variance and Classical variance which overcomes the shortcoming of traditional wavelet threshold method. Finally, the innovative threshold algorithm is experimentally evaluated on FOG. The mathematical evaluation results show that the new method can get better signal-to-noise ratio (SNR) and gain the reconstruction signal of the higher correlation coefficient (CC). As an experimental validation, the nonlinear capability of error back propagation neural network (BP neural network) is used to fit the drift trend item and find out the complex relationship between the FOG drift and temperature, and the final processing results indicate that the new denoising method can get better root of mean square error (MSE).

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Investigation of the effects of temporal thermal gradients in fiber optic gyroscope sensing coils, part 2

Cited by 18 publications

References 0 publications

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

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

A novel method for determining and improving the quality of a quadrupolar fiber gyro coil under temperature variations

An Innovative Wavelet Threshold Denoising Method for Environmental Drift of Fiber Optic Gyro

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