Research On Angular Velocity Sensing Based On Slow - Motion Structure Of Coupled Resonator

The advantage and application prospect of FOG is received much concern as an inertial measurement unit. It has become the core component in the new generation of inertial guidance system. As the performance requirements for FOG is increasing day by day, a series of improvement measures are put forward with further study on FOG. A technique with slow light to improve the sensitivity of the detection of the angular velocity owned the top topic in the world. So, is very necessary to the research on the key issue and main theoretical involved.We have a overview of fiber optic gyro in this paper, and analyze the basic principle of slow light angular velocity at the same time. According to analyze the ring resonator, a new type of coupled resonator is proposed. An optical gyroscope comprising a double-ring slow-light structure (DRSLS) coupled by a 3×3 coupler is presented. The principle whereby the slow light improves the sensitivity of the angular velocity detection is analyzed theoretically. According to the 3X3 coupler transmission matrix is deduced double-ring slow-light structure of response between the input and output waveguides. The expression for the rotation phase difference of the DRSLS between the counter-propagating waves is derived and discussed.The effects of the loss and the coupling coefficient on the phase difference are also mentioned. The paper determines the angular velocity sensor based on double-ring slow-light structure optimal sensitivity of the optimal parameters.A signal detection scheme of Slow light gyro scheme is provided, which is based on the integrated optic phase modulator.After applying a square wave to the modulator, we obtain the linear relationship between the phase difference and the angular velocity. Thus, the complexity of the signal detection is greatly reduced, and the best sensitivity of the system is obtained, especially near the zero-input angular velocity.