A Method for Evaluation and Compensation of Reciprocity Symmetry of Optical Fiber Ring

Abstract

The invention discloses a reciprocal symmetry evaluation and compensation method of an optical fiber ring. The invention uses the enhanced Brillouin back reflection detection technology to obtain the internal stress state distribution data of the optical fiber ring representing the reciprocity symmetry, establishes a symmetry model within the working temperature range through the distribution data, and analyzes and evaluates the reciprocity of the optical fiber ring to be tested Symmetry; at the same time, according to the optimal reciprocity symmetry position and the error size and error direction, adjust the relationship between the actual geometric symmetry position and optical symmetry position to compensate the error, realize the high reciprocity symmetry of the fiber ring, and effectively reduce the optical fiber Ambient nonreciprocity error due to poor symmetry of the ring. The invention has simple implementation method, strong comprehensive applicability, high measurement accuracy, high reliability and repeatability, can evaluate the quality of the optical fiber ring by evaluating the reciprocal symmetry of the optical fiber ring, and can compensate the symmetry error, greatly reducing or even Eliminate non-reciprocal errors and improve the environmental adaptability of the fiber optic ring.

Description

technical field [0001] The invention belongs to the technical fields of optical measurement and optical fiber sensing, and in particular relates to a reciprocal symmetry evaluation and compensation method of an optical fiber ring. Background technique [0002] Fiber OpTic Gyroscope (FOG for short) is an all-solid-state inertial instrument that uses the optical Sagnac effect (sagnac) to measure the angular rate of the carrier space. It uses optical fibers of different lengths to measure angular rates with different accuracy. Angular rate sensor. With simple structure and flexible design, it is the second-generation optical all-solid-state inertial instrument and will be the main instrument for inertial navigation applications. [0003] When the fiber optic gyroscope rotates, it produces a phase change that is positively correlated with the angular rate. The two beams of light of the interferometer propagate towards each other through the closed optical path formed by the fi...

AI Technical Summary

Problems solved by technology

However, due to the poor correlation between the former and the reciprocal symmetry, it has no practical significance; the latter test is only a relative quantity, which cannot correspond to the final result, and the test accuracy is poor, which cannot meet the reciprocal symmetry evaluation of the optical fiber ring.

[0006] The enhanced Brillouin back reflection detection technology is used to evaluate the stress that affects the light transmission performance of the optical fiber, but at present, the release situation can only be observed intuitively, and there is no quantitative evaluation method to analyze the reciprocal symmetry of the optical fiber ring, especially It is also lack of accurate evaluation criteria when analyzing the full temperature characteristics of the specific application temperature environment of the gyroscope

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