A New Optical Method for Suppressing Radial Magnetic Error in a Depolarized Interference Fiber Optic Gyroscope

Abstract

Based on the theory of the radial magnetic error (RME) in depolarized interference fiber optic gyroscopes (D-IFOGs) under magnetic field, a new optical method is proposed to decrease the RME by adding a suppressing section fiber (SSF) in D-IFOGs. A related theoretical model is established, and the solutions of the parameters of the SSF are obtained with numerical calculations. Then the results of the suppressed RME are simulated. An experimental system is set up to verify the theory and simulation, and the experimental results prove that the RME can be suppressed effectively with a SSF added in the D-IFOG. The magnitude of the RME can be reduced to one-tenth of the original.

Research on Three-Dimensional Magnetic Induced Error Model of Interferometric Fiber Optic Gyro

“…In order to reduce the device, the long side of Y waveguide is used as the reference, and the parallel direction is used as positive direction. Keeping the parameters of fiber coil unchanged, we change the angle between the radial magnetic field and IFOG, and record the output of IFOG [24]. The series magnetic field of 0.…”

“…where E 0 is initial electric field component in the fiber optic coil. The fiber coil is divided into n pieces, the length of the piece is dz = L/n [24]. φ = φ s + ∆φ(t) contains the Sagnac phase shift φ s and the modulation-induced phase ∆φ(t).…”

“…However, the magnetic shielding cannot completely isolate the magnetic field, and the Faraday effect-induced bias error still exists in the IFOG. At present, the study of Faraday phase shift is based on two-dimensional model with a singledirection magnetic field in IFOG [22], [23], [24], [25]. Actually, the IFOG is subjected to the radial magnetic field and the axial magnetic field simultaneously, so the single magnetic field cannot accurately calculate the Faraday effect-induced bias error under actual conditions.…”

A fiber optic gyroscope based on integrated optoelectronic devices

“…After more than 40 years of development, Fiber Optic Gyroscope (FOG) has been widely used in various fields [1][2]. In recent years, various types of miniaturized gyroscopes have developed rapidly, gradually forming a competitive advantage over traditional fiber optic gyroscopes in the field of light and small equipment.…”

Magneto-Refractive Effect and Mechanism Analysis of Erbium-Ytterbium Co-Doped Silica Fiber

“…At present, optical fiber magnetic field sensing methods mainly include the magneto-optic Faraday effect [3], tunable refractive index (RI) of magnetic fluid (MF) [4], and magnetostrictive method [5], etc. A magnetic field sensor based on the Faraday effect uses metallic glass and crystals with a large Verdet constant as the sensing unit to achieve target detection by measuring the Faraday rotation angle [6]. Although these sensors have the advantages of a simple structure and fast response speed, and are widely used in current and pulsed magnetic fields, there are certain drawbacks because the measurement of their optical path requires high polarization stability and their sensitivity is limited by the low Verdet constant.…”