Closed Loop Optical Resonator Gyro Locked Key Technologies

Resonant optical gyroscope having a long life, high reliability, good arguments stability. It works, determines the resonant optical gyroscope miniaturization potential, light weight, small size, its construction of inertial systems, low power consumption advantages. Related devices in micro and nano satellite inertial navigation guidance, attitude determination and attitude stability, and well inclinometer, inclinometer dam related fields, geodesy and vibration measurement has wide applications, in-depth study of resonant optical gyroscope having very important scientific significance.Resonant optical gyroscope is based Sagnac effect, through the through microcavities along, counterclockwise beam transmitted frequency difference detection, enabling accurate measurement of the angular velocity. Carrier rotation caused by the resonance frequency difference is extremely weak, and the dynamic range of the resonance frequency difference are large optical cavity temperature, magnetic fields and other environmental factors are very sensitive; the large dynamic range of the resonant frequency difference at high accuracy of frequency error detection more difficult. At present, the common solution is to use a closed-loop tracking technology lock-locked fiber ring resonator counter-clockwise optical transmission signal path all the way, using correlation detection technology to extract weak signals another way, therefore, the fiber ring resonator frequency of locking technology is very important.In this paper, the traditional analog lock-in amplifiers improved, dual-phase lock-in amplifier circuit, the transmission spectrum of the modulated wave demodulates; digital frequency lock circuit according to a light path of the demodulated signal to achieve frequency tracking lock. The performance of the Fast Track locked system was tested and the results show that the system is stable, the laser frequency can be locked to the resonance frequency of the light path is set, testing requirements to meet R-FOG system.