A Microfiber Polarization Coupler for Vector Stress Monitoring

A technology of stress monitoring and micro-optical fiber, which is applied in the field of sensing, can solve problems such as inaccurate target task requirements and inability to vectorize, and achieve high fatigue limit, good corrosion resistance, and high stability

CN113138044BActive Publication Date: 2022-02-18NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-02-18

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Abstract

The invention proposes a micro-fiber polarization coupler for vector stress monitoring. The elliptical micro-fiber wrapped by the cladding of the micro-fiber is connected with vertical stress rods and horizontal stress rods to the strain shell in four directions. The strain shell is divided into two parts, left and right, separated by a supporting diaphragm. The center of the two parts is an elliptical microfiber. At the same time, a low refractive index polymer buffer is installed in the entire straining shell, and a rectangular hollow core microfiber is placed in the middle of the supporting diaphragm. , which is filled with fluorescent particles, connected to a CCD detector on the optical fiber for fluorescence collection, analysis and storage. Combining the analysis results in the vertical direction and the horizontal direction, the stress is expressed in the form of vector to achieve the effect of vector stress monitoring. The system monitors stress in the form of vectors, and is applied to high-risk constructions such as building construction and large-scale project construction that require high-precision operations. When the accurate monitoring value is close to the control value, an alarm is issued to ensure the safety of the construction. It can also be used to check whether the construction process is reasonable.
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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-...

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below through technical texts and drawings.

[0022] As shown in the figure, a micro-fiber polarization coupler for vector stress monitoring of the present invention has a main body consisting of a vertical stress rod 5, a horizontal stress rod 6, an elliptical micro-fiber 4, a rectangular hollow-core micro-fiber 8 and a CCD detector 10 coupled stress conduction monitoring structure; such as figure 1 , when the stress in the vertical direction acts, the stress is transmitted to the micro-fiber cladding 7 and the elliptical micro-fiber 4 through the vertical stress rod 5, causing them to deform; when the stress in the horizontal direction acts, the stress in the horizontal direction of the strain shell 1 is transmitted to The micro-fiber cladding 7 and the elliptical micro-fiber 4 enhance the internal light field of the rectangular hollow-core micro-fiber 8 and increase the visible light fluorescen...