Two-path loop-locked resonant mode optical gyro

Abstract

The invention discloses a two-path loop-locked resonant mode optical gyro, which comprises an optical system comprising a tunable laser, an optical splitter, optical frequency shifters, optical modulators, an optical resonant cavity, a photoelectric conversion module and the like, and a processing circuit consisting of a demodulation module and feedback lock modules. In the optical gyro, two paths of signals with gyro rotation information are extracted by the processing circuit, and the frequency shift quantities of two paths of frequency shifters are respectively changed through two feedbacklock modules; simultaneously the two paths of signals are added together and then locked at the central point of clockwise and anticlockwise optical path resonant frequencies of the resonant cavity after the laser frequency is controlled by a third feedback lock module; and finally the frequency shift quantity outputs of the two paths of frequency shifters are subtracted each other to obtain a gyro signal. The two-path loop-locked resonant mode optical gyro disclosed by the invention is conductive to improving the reciprocity of the resonant mode optical gyro and better eliminating reciprocity noise, is conductive to improving the linear and the dynamic range of a gyro system, and is conductive to reducing the optical power difference of clockwise and anticlockwise light paths in the cavity and reducing optical Kerr noise.

Description

technical field [0001] The invention relates to the technical field of optical sensing and signal detection, in particular to a double-channel closed-loop resonant optical gyroscope. Background technique [0002] Resonator Optic Gyro (ROG) is a high-precision miniature inertial sensor that uses the optical Sagnac effect to detect rotation. The resonant optical gyro without vibrating parts has the advantages of miniaturization, high precision and anti-vibration. Compared with Micro Electro Mechanical Systems (MEMS) and Fiber Optic Gyroscopes (Interferometric Fiber Optical Gyroscope, IFOG), ROG will have greater advantages. [0003] The most common locking method in ROG is single-channel locking, that is, the center frequency of the laser is locked on one of the resonant frequencies, and the output of the other channel is the gyro signal output. However, the problem with single-channel locking is that the loop bandwidth is narrow, and the gyro The output linearity is smal...

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Problems solved by technology

[0003] The most common locking method in ROG is single-channel locking, that is, the center frequency of the laser is locked on one of the resonant frequencies, and the output of the other channel is the gyro signal output. However, the problem with single-channel locking is that the loop bandwidth is narrow, and the gyro The output linearity is small; the dual-channel closed-loop also has certain applications in ROG, but the existing dual-channel closed-loop scheme does not build a relatively reciprocal structure, so that the reciprocal noise is not well suppressed

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