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.
Highlights
Inertial sensors for rotation are used widely in commercial and military systems
X = Ey), the Faraday effect-induced bias error can be eliminated by optical compensation regardless of the changes of the temperature
Substituting Equations (10) and (11) into Equation (15), when the intensities of two polarizations are balanced (Ex = Ey ), the Faraday effect-induced bias error can be eliminated by optical compensation regardless of the changes of the temperature
Summary
Inertial sensors for rotation are used widely in commercial and military systems. In the tactical applications market, the microelectromechanical systems (MEMS) gyroscope [1,2,3] and resonant micro optical gyroscope (RMOG) [4,5,6] have attracted much attention due to compactness, light weight, and low-cost. As opposed to RLG, the IFOG is a truly solid-state device using semiconductor light sources as opposed to high voltage gas lasers, and offers greater reliability. The IFOG is used in a variety of applications, including ship and sub-sea inertial navigation, along with stabilization and positioning, and it is expected to become the ultimate rotation sensing technology [11,12]
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