Fiber-optic ring reciprocity symmetry evaluating method and compensation method

Abstract

The invention discloses a fiber-optic ring reciprocity symmetry evaluating method and a compensation method. According to the invention, fiber-optic ring inner stress state distribution data of the representation reciprocity symmetry is acquired by using enhanced Brillouin back reflection detection technologies, a symmetry model within an operating temperature range is established through the distribution data, and the reciprocity symmetry of a fiber-optic ring to be detected is analyzed and evaluated; and meanwhile, the relation between an actual geometric symmetry position and an optical symmetry position is adjusted according to the acquired optimal reciprocity symmetry position, the error size and the error direction so as to compensate the error, thereby realizing high reciprocity symmetry of the fiber-optic ring, and effectively reducing the environmental nonreciprocal error caused by poor symmetry of the fiber-optic ring. The implementation method is simple, the comprehensive applicability is high, the measurement precision is high, the reliability and the repeatability are high, and the quality of the fiber-optic ring can be estimated through evaluating the reciprocity symmetry of the fiber-optic ring. Meanwhile, the symmetry error can be compensated, the nonreciprocal error is greatly reduced or eliminated, and the environmental adaptability of the fiber-optic ring is improved.

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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