Micro optical fiber polarization coupler for vector stress monitoring

Abstract

The invention provides a micro optical fiber polarization coupler for vector stress monitoring. An elliptical micro optical fiber wrapped by a micro optical fiber wrapping layer is connected with vertical stress rods and horizontal stress rods in four directions and is connected to a strain shell. The strain shell is divided into a left part and a right part which are separated by a supporting diaphragm, the centers of the two parts are elliptical micro optical fibers, meanwhile, a low-refractive-index polymer buffer solution is filled in the whole strain shell, a rectangular hollow-core micro optical fiber is placed in the middle of the supporting diaphragm and is filled with fluorescent particles, and the optical fibers are connected with a CCD detector for collecting, analyzing and storing fluorescence. And the stress is represented in a vector form by combining analysis results in the vertical direction and the horizontal direction, so that the effect of vector stress monitoring is achieved. The system monitors stress in a vector form, is applied to high-risk and high-precision work such as a building construction process and large-scale project construction, can give an alarm when an accurate monitoring value is close to a control value, is used for ensuring the safety of construction, and can also be used for checking whether the construction process is reasonable or not.

Description

technical field [0001] The invention belongs to the field of sensing technology, and relates to a coupler of a hollow-core micro-fiber, in particular to a polarization coupler of a micro-fiber used for vector stress monitoring. Background technique [0002] Micro-nano optical fiber refers to an optical fiber with a diameter of micrometers and nanometers obtained by drawing ordinary optical fibers in a molten state. Due to the advantages of small size, strong optical field confinement ability, low loss, and strong evanescent field transmission ability, micro-nano optical fiber has been widely used in optical sensing, optical communication, and other fields in recent years. The fiber optic coupler first used fusion splicing to realize the welding between multi-mode fibers, and then used similar fusion splicing technology to realize the welding between single-mode fibers. In 2017, Wang Hai, Zhou Wenchao and others proposed a high-sensitivity, portable biosensor based on micro-...

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem that the traditional optical fiber stress monitoring is not accurate enough for the target task and cannot be vectorized, and proposes a micro-fiber polarization coupler for vector stress monitoring

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