Investigation on scale factor and output nonlinearity in resonator micro-optic gyro

The output nonlinearity of the resonator micro-optic gyro (RMOG) becomes significant along with the increase of the rotation rate. The influence on the scale factor and output nonlinearity by bias-frequency-modulation rate was theoretically analyzed. Corresponding to the resonant characteristics of the RMOG, theoretical scale factor and output nonlinearity within the rotation rate range were calculated. Furthermore, analysis on scale factor error induced by temperature was carried out. RMOG experimental system was set up, with the scale factor of ~0.95. Nonlinearity of 6.88×10 ^-4 and 0.93% in the region from 500(°)/s to +500(°)/s were reliably achieved in the simulated and real rotational test, expressing the output nonlinearity can be low enough for most inertial application with proper countermeasure to eliminate the influence from the environment.