Dynamically monitoring the instantaneous zero rotation rate voltage of interferometric fiber optic gyroscope (IFOG)

摘要

The drift (°/h) for an interferometric fiber optic gyroscope (IFOG) means the variations on the voltage generated versus the zero angular (rotation) rate, while IFOG is not under influence of any angular rate effect. If the drift of an IFOG is predefined, the compensation of the drift can trivially be carried out by a subtraction process. However, with this invention, the necessity of the predefinition of the zero rotation rate voltage of the IFOG which belongs to the primary coil called “Gyro Coil” herein, is removed because the instantaneous variations on the zero rotation rate voltage of the IFOG can be monitored either periodically or whenever required with help of a secondary coil, called as “Monitor Coil”, which is able to be switched by a microcontroller controlled-MEMS fiber optic ON/OFF switches. The new configuration of IFOG, to be referred as Dynamical Drift Monitoring-Interferometric Fiber Optic Gyroscope (DDM-IFOG) and the new method presented and implemented in this invention are valid for IFOG having open-loop and closed-loop schemes by engaging the voltage of zeroing the total phase (Feedback Phase Ø plus Sagnac Phase Shift) in the sensing coil instead of directly using the voltage of the demodulation circuit induced by the Sagnac Phase Shift (SPS).