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Sensors 2017, 17(9), 2046; https://doi.org/10.3390/s17092046

Temperature Dependence of Faraday Effect-Induced Bias Error in a Fiber Optic Gyroscope

1
College of Automation, Harbin Engineering University, Harbin 150001, China
2
Shandong Institute of Space Electronic Technology, Yantai 264000, China
*
Author to whom correspondence should be addressed.
Received: 2 August 2017 / Revised: 29 August 2017 / Accepted: 5 September 2017 / Published: 7 September 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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Abstract

Improving the performance of interferometric fiber optic gyroscope (IFOG) in harsh environments, such as magnetic field and temperature field variation, is necessary for its practical applications. This paper presents an investigation of Faraday effect-induced bias error of IFOG under varying temperature. Jones matrix method is utilized to formulize the temperature dependence of Faraday effect-induced bias error. Theoretical results show that the Faraday effect-induced bias error changes with the temperature in the non-skeleton polarization maintaining (PM) fiber coil. This phenomenon is caused by the temperature dependence of linear birefringence and Verdet constant of PM fiber. Particularly, Faraday effect-induced bias errors of two polarizations always have opposite signs that can be compensated optically regardless of the changes of the temperature. Two experiments with a 1000 m non-skeleton PM fiber coil are performed, and the experimental results support these theoretical predictions. This study is promising for improving the bias stability of IFOG. View Full-Text
Keywords: fiber optics sensors; gyroscope; Faraday effect; magnetic fields; bias errors fiber optics sensors; gyroscope; Faraday effect; magnetic fields; bias errors
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Li, X.; Liu, P.; Guang, X.; Xu, Z.; Guan, L.; Li, G. Temperature Dependence of Faraday Effect-Induced Bias Error in a Fiber Optic Gyroscope. Sensors 2017, 17, 2046.

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