Quantum dot optical fiber microbend sensor with position detection function

Abstract

The invention belongs to the field of optical fiber sensing application, and particularly relates to a quantum dot optical fiber microbend sensor with a position detection function. The quantum dot optical fiber microbend sensor is used for detecting single-point microbend and multi-point microbend. Ultraviolet light is used as an excitation light source; when micro-bending loss occurs, ultraviolet light overflows from the fiber core to excite quantum dot particles coated at specific positions outside the cladding, excited quantum dots emit characteristic spectrums, the characteristic spectrums are coupled back to the fiber core and a spectrograph at a detected end for detection and analysis, and the micro-bending loss occurrence position and the micro-bending degree are determined. The number of the used optical fibers is the same as that of the used quantum dots, so that the use efficiency can be maximized. If N optical fibers and N kinds of fluorescent materials are used, a detection area can be divided into N(N+1) areas, and the detection efficiency is greatly improved compared with the situation that only one position can be detected by one kind of initial quantum dots.

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...

AI Technical Summary

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.

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