Double-closed loop locking technology-based resonant optical gyro

Abstract

The invention discloses a double-closed loop locking technology-based resonant optical gyro. The double-closed loop locking technology-based resonant optical gyro comprises an optical system composed of a tunable laser, an optical shunt, two frequency shifters of a first frequency shifter and a second frequency shifter, two modulators, an optical resonant cavity and a photoelectric conversion module, and a processing circuit composed of a modulation-demodulation module and three feedback locking modules. Main components of the optical system comprise the tunable laser as a double-closed loop feedback terminal and the two frequency shifters. A first signal extracted by the modulation-demodulation module can respectively change frequency shift amounts of the tunable laser and the first frequency shifter through two of the threes feedback locking modules. A second signal extracted by the modulation-demodulation module can change a frequency shift amount of the second frequency shifter through another feedback locking module. A rotation signal is obtained according to the difference between frequency shift amounts of the first frequency shifter and the second frequency shifter. The double-closed loop locking technology-based resonant optical gyro has a completely reciprocal resonant optical gyro structure, and is beneficial for elimination of reciprocal noise of a system, improvement of system linearity, broadening of a system dynamic scope, and reduction of optical Kerr noise.

Description

Technical field [0001] The invention relates to the field of optical sensing and signal detection, in particular to a resonant optical gyroscope based on a dual-circuit closed-loop locking technology. Background technique [0002] Resonator Optic Gyroscope (ROG) is a high-precision inertial sensor based on the Sagnac effect to achieve angular velocity detection. It detects the rotation angular velocity of the object by detecting the resonance frequency difference caused by the clockwise transmission of light in the system. Compared with interferometric optical gyroscopes, resonant optical gyroscopes have greater advantages in miniaturization and integration. [0003] The detection scheme using a single-circuit closed-loop ROG mainly locks the center frequency of the laser to the resonant frequency of one of them, and the other directly detects effective signals. Using a single-circuit closed-loop ROG, through the design of the first locked loop, the laser frequency noise and other...

AI Technical Summary

Problems solved by technology

However, a too narrow low-pass filter will greatly reduce the response speed of the system, which does not meet the application requirements of the gyroscope, and the dynamic range and linearity of the single-channel closed-loop ROG output are limited

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