Distributed type sensing device based on double-core double-wrapping layer optical fiber

A technology of double-clad optical fiber and sensing device, which is applied in the direction of multi-layer core/clad optical fiber, clad optical fiber, optical device, etc. Cost and other issues, to achieve the effect of good market prospects, long monitoring distance and low cost

Inactive Publication Date: 2013-06-19
XIAN JINHE OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Long-distance oil, water or gas pipelines are widely used due to the advantages of high work efficiency, safety, and low cost. However, there is currently no suitable means for monitoring long-distance pipelines. Brillouin scattering transmission based on ordinary optical fibers Sensing devices have the advantages of distributed monitoring of temperature and strain, but their high cost limits their popularization.

Method used

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  • Distributed type sensing device based on double-core double-wrapping layer optical fiber
  • Distributed type sensing device based on double-core double-wrapping layer optical fiber
  • Distributed type sensing device based on double-core double-wrapping layer optical fiber

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Embodiment 1

[0031] like figure 1 , figure 2 , image 3 A kind of distributed sensing device based on double-core double-clad optical fiber shown, comprises control module 6, light source module 8, photodetector module one 7 and photodetector module two 9, control module 6 and light source module 8, respectively The optical detector module one 7 is connected with the optical detector module two 9; the light source module 8 is connected with the 1 port of the 1×2 optical coupler 10, and the 2 ports of the 1×2 optical coupler 10 are connected with the 1 port respectively. One end of port 2 of ×2 optocoupler II 11 is connected to one end of port 2 of 1 × 2 optocoupler III 12, and the other end of port 2 of 1 × 2 optocoupler II 11 is connected to 1 × 2 optocoupler III The other end of port 2 of 12 is respectively connected with photodetector module 1 7 and photodetector module 2 9, port 1 of 1×2 photocoupler 2 11 and port 1 of 1×2 photocoupler 3 12 are respectively connected with The two n...

Embodiment 2

[0041] like Figure 4As shown, the difference between the present embodiment and the first embodiment is that the first photodetector module 7 and the second photodetector module 9 are connected to the differential amplifier 16 , and the differential amplifier 16 is connected to the control module 6 .

[0042] In this embodiment, the structures, connections and working principles of other parts are the same as those in Embodiment 1.

Embodiment 3

[0044] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that an optical fiber delay line 15 is arranged between the first photodetector module 7 and the second 1×2 optical coupler 11 .

[0045] 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 distributed type sensing device based on a double-core double-wrapping layer optical fiber. The distributed type sensing device based on the double-core double-wrapping layer optical fiber comprises a controlling module, a light source module, a first light detector module and a second light detector module. The light source module, the first light detector module and the second light detector module are respectively connected with the controlling module. One opening end of a1*2 light coupler and one opening end of a 1*2 third light coupler are respectively connected with a first passage and a second passage. The first passage and the second passage are arranged in the inner portion of the light coupler and are not mutually interfered. The distributed type sensing device based on the double-core double-wrapping layer optical fiber further comprises a sensing optical fiber. The sensing optical fiber comprises a first wrapping layer and a second wrapping layer arranged on the outer side of the first wrapping layer. A first fiber core and a second fiber core are arranged in the first wrapping layer in a side-by-side mode. A protection layer is arranged on the outer side of the second wrapping layer. The first passage and the second passage are respectively connected with the first fiber core and the second fiber core of the sensing optical fiber. The distributed type sensing device based on the double-core double-wrapping layer optical fiber is convenient to use and low in cost. The distributed type sensing device based on the double-core double-wrapping layer optical fiber has good application prospect.

Description

technical field [0001] The invention relates to a sensing device, in particular to a distributed sensing device based on a double-core double-clad optical fiber. Background technique [0002] Long-distance oil, water or gas pipelines are widely used due to the advantages of high work efficiency, safety, and low cost. However, there is currently no suitable means for monitoring long-distance pipelines. Brillouin scattering transmission based on ordinary optical fibers Sensing devices have the advantage of distributed monitoring of temperature and strain, but their high cost limits their popularization. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings in the above-mentioned prior art and provide a distributed sensing device based on a double-core double-clad optical fiber. The optical fiber of the sensing device has double cores, thereby forming two optical signal transmission channels, and the purpose of distributed mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16G02B6/036
Inventor 杜兵
Owner XIAN JINHE OPTICAL TECH
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