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

Content Provider	IEEE Xplore Digital Library
Author	Webber, M. Willig, R. Rackowski, H. Dineen, A.
Copyright Year	1983
Abstract	Interferometric fiber-optic gyroscopes exhibit time-dependent rate error patterns during operation due to environmental stress on the fiber coil. Short-term errors, equilibrating on the order of minutes to several hours, are attributed to nonreciprocity due to thermal gradients. Long-term rate errors, equilibrating on the order of days to weeks, have not been thoroughly addressed. In this study, we show that diffusion of moisture into or out of a sense coil can cause long-term rate errors. To calculate this effect, we measured the effect of moisture on the mechanical properties of the optical fiber coating. Using these data, we modeled diffusion in a sense coil with finite-element analysis. The rate error is calculated with an integral that is similar to that used by Shupe and others. A variation in water concentration in the coil due to diffusion causes changes in the properties of the fiber coating. This in turn produces nonreciprocal stresses on the waveguide and leads to a rate error.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	2356
Ending Page	2362
Page Count	7
File Size	1302119
File Format	PDF
ISSN	07338724
Volume Number	30
Issue Number	14
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Stress Moisture Humidity Young's modulus Optical fibers Coatings Coating diffusion coefficient error fiber-optic gyroscope finite-element method (FEM) humidity stress
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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