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A quantum dot optical fiber microbend sensor with position detection function

A microbend sensor and quantum dot technology, applied in instruments, measuring devices, optical devices, etc., can solve problems such as multi-point pressure detection that cannot measure the specific position of optical fiber microbends

Active Publication Date: 2022-03-18
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these optical fiber microbend sensors only detect the output power of the optical fiber, and cannot measure the specific location of the optical fiber microbend and perform multi-point pressure detection.

Method used

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  • A quantum dot optical fiber microbend sensor with position detection function
  • A quantum dot optical fiber microbend sensor with position detection function
  • A quantum dot optical fiber microbend sensor with position detection function

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] figure 1 It is the structural diagram of the sensitive optical fiber used, including the fiber core 1-1, the fluorinated polymer cladding 1-2, and the quantum dot mixed fluorinated polymer coating 1-3. The refractive index profile is the core n 1 , cladding n 2 with quantum dot coating n 3 , air 1-4 refractive index n 4 , where n 1 ﹥n 2 =n 3 ﹥n 4 . figure 2 It is an overall structure of a plurality of optical fiber groups, including an ultraviolet light source 2-1, a deformer 2-2, an optical fiber combiner 2-3, and a spectrometer 2-4. image 3 It is the arrangement of the detection group composed of multiple detection optical fibers, and it shows the different materials coated in different sections, among which 3-1 is a white optical fiber without quantum dot coating, 3-2 is coated with quantum dot 1, 3-3 Coated quantum dot 2, 3-4 quantum dot 3, 3-5 c...

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Abstract

The invention belongs to the field of optical fiber sensing applications, and in particular relates to a quantum dot optical fiber microbending sensor with a position detection function for detecting single-point and multi-point microbending. The present invention uses ultraviolet light as the excitation light source and propagates inside the optical fiber. When microbend loss occurs, the ultraviolet light overflows the fiber core to excite the quantum dot particles coated at a specific position outside the cladding, and the excited quantum dots emit characteristic spectra, and Coupled back to the fiber core, the spectrometer at the detected end detects, analyzes, and confirms the location and degree of microbending loss. The invention uses the same number of optical fibers as the number of quantum dots to maximize the use efficiency. If N optical fibers and N types of fluorescent materials are used, the detection area can be divided into N(N+1) areas, which is greatly improved compared to the initial one quantum dot that can only detect one position.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing applications, and in particular relates to a quantum dot optical fiber microbending sensor with a position detection function for detecting single-point and multi-point microbending. Background technique [0002] Optical fiber has the advantages of good electrical insulation performance, no electromagnetic interference, no spark, and can be used in flammable and explosive environments, so it has attracted more and more attention. Various optical fiber sensors have come out one after another. Plastic optical fiber is a kind of optical fiber made of high refractive index polymer core matrix and low refractive index polymer cladding material. It can be used for curvature sensing similar to silica optical fiber, but it has obvious differences compared with silica optical fiber. Easy to bend, not easy to break, and low cost. Therefore, plastic optical fibers are often used in microbend sensors. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/18
Inventor 孙伟民戴昕宇谢天赐耿涛张彬李昊鹏石锲铭钱金钱贺泊李松
Owner HARBIN ENG UNIV
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