Design method of optical fiber sensing ring of optical fiber current transformer based on 650nm waveband

Abstract

The invention relates to a design method of an optical fiber sensing ring of an optical fiber current transformer based on a 650nm waveband. The invention belongs to the technical field of all-fiber current sensing design. The method comprises the steps of enabling a cross section structure of an optical fiber to be provided with multiple layers of air holes; determining chiral parameters of the optical fiber according to the concentration of griseofulvin in PMMA in a refractive index guide type chiral photonic crystal fiber; determining the value range of the air filling ratio of the opticalfiber, and randomly taking the numerical value meeting the requirement as the final air filling ratio of the optical fiber; and determining the value range of the lattice constant of the optical fiberaccording to the obtained chiral parameters and air filling ratio of the optical fiber, and randomly taking the numerical value meeting the requirement as the final lattice constant of the optical fiber. The ratio difference of an optical fiber current transformer system adopting the scheme of a photonic crystal optical fiber sensing ring is 0.235%, the rationality of the parameter design of thedesigned chiral photonic crystal optical fiber is proved, and the current measurement accuracy of the optical fiber current transformer system is indicated to be improved.

Description

technical field [0001] The invention relates to the technical field of all-fiber current sensing design, and relates to a design method of an optical fiber sensing ring of an optical fiber current transformer based on a 650nm wave band. Background technique [0002] Optical fiber current transformer is a kind of optical fiber sensor based on Faraday rotation effect. Because of its good insulation, high reliability, wide frequency range and good transient characteristics, it is widely used in power transmission industry and electrolytic aluminum industry. These industries have put forward high-precision requirements for the current measurement of optical fiber current transformers. The main factor limiting the accuracy of the system is the imperfection of the optical fiber sensing ring in the system. Polarized light is transmitted in the form of circularly polarized light in an ideal optical fiber sensing ring, but due to the unsatisfactory manufacturing process of the optic...

AI Technical Summary

Problems solved by technology

However, there are still some problems with this fiber

First, the spin rate of the fiber stress filament is not uniform, which means that its pitch is also not uniform, which will cause residual linear birefringence in the fiber

Second, there is a huge stress in the fiber drawing process, which will cause changes in the photoelastic properties of the fiber core over time, which will gradually weaken the suppression effect of its linear birefringence

These problems in the optical fiber limit the further improvement of the system accuracy

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