Magnetic shielding case of fiber-optic gyroscope

Abstract

The invention belongs to the fiber-optic gyroscope technology, and relates to a magnetic shielding case of a fiber-optic gyroscope, which is reusable, and easy to assemble and disassemble. The magnetic shielding case of the fiber-optic gyroscope comprises an upper shielding case, a lower shielding case, a base, a skeleton and a fiber-optic ring, wherein an upper shielding case inner ring is located between the inner cylindrical surface of the skeleton and a lower shielding case side wall, the fiber-optic ring surrounds the outer periphery of the skeleton and is closed by the upper shielding case. An upper shielding case cover plate, the upper shielding case inner ring, the lower shielding case side wall, a lower shielding case bottom plate, an upper shielding case bottom plate and an upper shielding case outer ring form a closed magnetic circuit, the magnetic sensitive part in a fiber-optic gyroscope optical path can be right surrounded by the closed magnetic circuit, and the closed magnetic circuit is perpendicular to the spreading direction of light, thus realizing high-performance magnetic shielding and further playing a role in protecting the fiber-optic ring. In addition, without the use of modes of gluing or welding and the like, all parts are assembled only by using fasteners in the assembling process of the magnetic shielding case of the fiber-optic gyroscope, the shielding case is simple and easy to assemble and disassemble.

Description

technical field [0001] The invention belongs to the optical fiber gyroscope technology, and relates to a reusable, easy-to-install and disassemble optical fiber gyroscope magnetic shielding cover. Background technique [0002] Fiber optic gyroscope is a kind of optical gyroscope based on Sagnac effect, which generally includes fiber optic ring and its installation skeleton, light source, coupler, integrated optical modulator, detector, etc. The earth's magnetic field and the environmental magnetic field will have a great impact on the performance of fiber optic gyroscopes, especially high-precision gyroscopes, through the Faraday effect and the Cole effect. [0003] As we all know, the magnetic field can cause a phase difference Δφ between the positive and negative beams of light in the fiber optic gyroscope through the Faraday effect, [0004] [0005] where ζ 0 is the Faraday rotation of the light, and its magnitude is the product of the magnetic field strength and th...

AI Technical Summary

Problems solved by technology

[0008] The upper and lower magnetic shields are generally fixed by bonding or welding, which makes it difficult to disassemble during debugging and maintenance

The material of the magnetic shield is usually soft magnetic alloy. The magnetic permeability of this type of material is greatly improved after stress annealing, and it also makes them very sensitive to stress and collision. Therefore, possible bumps and extrusions during installation and disassembly Such operations will lead to a decrease in the performance of the magnetic shield, thereby affecting the accuracy of the fiber optic gyroscope

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