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Vector stress meter based on micro-nano multi-core special optical fiber

A special optical fiber and multi-core optical fiber technology, applied in the field of sensing, can solve the problems of inability to detect the direction of stress and low sensitivity of optical fiber stress sensors, and achieve the effects of eliminating cross-sensitivity effects, promoting development, and improving sensitivity

Active Publication Date: 2020-08-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problems of low sensitivity of the traditional optical fiber stress sensor and the inability to realize the detection of the stress direction, and proposes a vector strain gauge based on micro-nano multi-core special optical fiber

Method used

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  • Vector stress meter based on micro-nano multi-core special optical fiber
  • Vector stress meter based on micro-nano multi-core special optical fiber
  • Vector stress meter based on micro-nano multi-core special optical fiber

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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 vector strain gauge based on the micro-nano multi-core special optical fiber of the present invention has a main body that is a cascaded structure obtained by welding the micro-nano multi-core special optical fiber 5 with the single-mode optical fiber A2 and the single-mode optical fiber B6; The broadband light source 11 emits light signals, and after passing through the cascade structure, a set of output spectra will be obtained on the spectrum analyzer 12, and when the external pressure acts on the cascade structure, it will deform and bend, so that the output spectrum is consistent with zero There is an offset during stress.

[0023] Among them, with the bending of the cascaded structure of the grating 1, the characteristic wavelength on its interference spectrum will move by Δλ 1 , the distance between the central ...

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Abstract

The invention discloses a vector stress meter based on a micro-nano multi-core special optical fiber. A single-mode optical fiber A, a single-mode optical fiber B and the micro-nano multi-core specialoptical fiber are welded, the micro-nano multi-core special optical fiber is composed of four cladding fiber cores, a central fiber core and a multi-core optical fiber cladding, a surface is coated with a polymer, and the surface of the polymer is engraved with a grating. Light emitted by a broadband light source enters a fiber core A of the single-mode optical fiber A for total reflection transmission, and when the light reaches a welding point, a part of the light enters the micro-nano multi-core special optical fiber and is transmitted in the four cladding fiber cores, the central fiber core and the multi-core optical fiber cladding; and the other part of the light enters the polymer for transmission and is modulated by the grating in real time. And all optical signals return to a spectrum analyzer after passing through the single-mode optical fiber B and the fiber core B to obtain a transmission spectrum. The stress meter adopts an all-fiber structure design, has characteristics of high sensitivity, flexibility and easiness in packaging, can be used for wearable behavior monitoring and auxiliary equipment, and realizes sensing and interaction of a stress direction and magnitude.

Description

technical field [0001] The invention belongs to the field of sensing technology, and relates to a cascaded structure composed of a micro-nano multi-core special optical fiber and a single-mode optical fiber, in particular to a vector strain gauge based on the cascaded structure, which can be used for wearable behavior monitoring and auxiliary equipment , to realize the perception and interaction of the force direction and magnitude. Background technique [0002] As early as the 1970s, Corning Corporation of the United States produced the first low-loss optical fiber. The typical optical fiber has a single-core structure, while the multi-core special optical fiber has a common outer cladding and contains multiple cores. The core has its own inner cladding. Although the production cost of this kind of multi-core special fiber is higher than that of single-core fiber, it has some special properties that single-mode fiber does not have, and has a broader application prospect. E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24G02B6/02
CPCG01L1/242G02B6/02042G02B6/02061G02B6/02395
Inventor 李晋李鑫王清晨余乐
Owner NORTHEASTERN UNIV LIAONING
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