Optical-path-structure open-loop gyroscope and working method thereof

Abstract

The invention discloses an open-loop gyroscope with an optical path structure and its working method. The optical fiber and the fourth port fiber are connected to the fiber ring, and a detector is also included, and the detector is connected to the coupler through the fifth port fiber, and a phase modulator is arranged in the fiber ring. The invention does not require special thin-diameter optical fibers, nor does it require a high-precision online manufacturing platform for optical devices, which greatly reduces the difficulty of product assembly technology, improves product reliability while ensuring product accuracy, and lays the foundation for the market popularization of open-loop gyroscopes. Base.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an open-loop gyroscope with an optical path structure and a working method thereof. Background technique [0002] The open-loop gyro has small size, light weight, simple structure and relatively excellent performance, and has broad market potential in the field of medium and low precision. [0003] At present, the principle of single-fiber fiber optic gyroscope with open-loop structure is as follows: figure 1 As shown, its working process is: after the light emitted by the online coupled SLD light source is split by the light source coupler, half of the light enters the polarizer, and produces single-mode and single-polarized light. The polarized light enters the fiber ring coupler, is divided into two beams of light clockwise and counterclockwise, satisfying the coherence condition, and propagates in the fiber ring. When the optical fiber rotates around its centr...

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Problems solved by technology

However, the optical path of the classic open-loop scheme is complicated to manufacture, the processing technology is immature, and high-cost special equipment is required. The extinction ratio of the produced polarizer is only 26dB, which leads to low precision of the gyro system, and the coupling efficiency of the online coupled optoelectronic device is low. Improving the signal-to-noise ratio of the system requires increasing the driving current of the light source, which directly leads to excessive power consumption of the gyro system, which limits its industrial application

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