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Fluorescent optical fiber

A fluorescent optical fiber and fluorescent material technology, which is applied to cladding optical fibers, multi-layer core/cladding optical fibers, etc. problems such as large absorption of light waves, to achieve the effect of good market prospects, simple structure and low cost

Inactive Publication Date: 2013-05-29
XIAN JINHE OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing fluorescent optical fiber temperature sensing device can only measure at a single point, and cannot achieve distributed or quasi-distributed measurement. The main reason is that when the core of the fluorescent optical fiber is doped with active fluorescent substances, the fluorescent The light wave transmitted in the core absorbs a lot, which results in a short transmission distance of both the incident light wave and the fluorescent light wave with the temperature signal, so it can only be used for single-point measurement
Limits the promotion and use of fluorescent fiber optic sensing devices in quasi-distributed or distributed monitoring

Method used

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  • Fluorescent optical fiber
  • Fluorescent optical fiber

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Effect test

Embodiment 1

[0025] Such as figure 1 A fluorescent optical fiber shown includes a core 1 and a cladding 2, the core 1 is inactive dopant, the cladding 2 is doped with an active fluorescent material, and the core The refractive index of 1 is greater than that of cladding 2. Most of the light wave signal incident in the fluorescent fiber is transmitted in the core 1, but a small amount of light wave signal is transmitted in the cladding 2, and the incident light wave can excite the active fluorescent material doped in the cladding 2, which emits Fluorescence, and part of the fluorescence is coupled into the core 1 for transmission, and the fluorescence can be acquired by a detector installed at the end of the fluorescent fiber; when the active fluorescent material doped in the cladding 2 changes with the external physical quantity, the incident light wave The fluorescence generated under the excitation also changes, and the detector can obtain the fluorescent light wave with the information...

Embodiment 2

[0034] Such as figure 2 As shown, in this embodiment, the difference from Embodiment 1 is that in the cladding 2, the region not greater than 5 microns from the interface between the core 1 and the cladding 2 is an undoped cladding region 4, That is, the region is not doped with fluorescent material. In this way, only when the fluorescent fiber is bent, micro-bent or deformed, part of the incident light will be coupled into the cladding 2 and the fluorescence will be excited, thereby expanding the usage of the fluorescent fiber. Preferably, there is an outer cladding layer 3 outside the cladding layer 2 , and the refractive index of the cladding layer 2 is greater than that of the outer cladding layer 3 .

[0035] In this embodiment, the structures, connections and working principles of other parts are the same as those in Embodiment 1.

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Abstract

The invention discloses a fluorescent optical fiber. The fluorescent optical fiber comprises a fiber core and a cladding layer, wherein the fiber core is free from an active doping agent; the cladding layer is internally doped with an active fluorescent material; the refractive index of the fiber core is greater than that of the cladding layer; and the active doping is located inside the cladding layer, but the fiber core is free from the active doping, so that incoming optical waves and fluorescent optical waves with the sensing information can be transmitted for a long distance in the fiber core, and the distributed or quasi-distributed monitoring and sensing purpose is realized. The fluorescent optical fiber is convenient to use and low in cost and has relatively good application foreground.

Description

technical field [0001] The invention relates to an optical fiber, in particular to a fluorescent optical fiber with no active doping in the core and active doping in the cladding. Background technique [0002] The existing fluorescent optical fiber temperature sensing device can only measure at a single point, and cannot achieve distributed or quasi-distributed measurement. The main reason is that when the core of the fluorescent optical fiber is doped with active fluorescent substances, the fluorescent The light wave transmitted in the core absorbs a lot, resulting in a short transmission distance of both the incident light wave and the fluorescent light wave with the temperature signal, so it can only be used for single-point measurement. This limits the popularization and use of fluorescent optical fiber sensing devices in quasi-distributed or distributed monitoring. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings in the prior a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036
Inventor 杜兵
Owner XIAN JINHE OPTICAL TECH