CN102243347B - Open type induction optical fiber - Google Patents
Open type induction optical fiber Download PDFInfo
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- CN102243347B CN102243347B CN 201110199779 CN201110199779A CN102243347B CN 102243347 B CN102243347 B CN 102243347B CN 201110199779 CN201110199779 CN 201110199779 CN 201110199779 A CN201110199779 A CN 201110199779A CN 102243347 B CN102243347 B CN 102243347B
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- optical fiber
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- overcoat
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Abstract
The invention relates to an open type induction optical fiber. According to the technical scheme provided by the invention, the open type induction optical fiber comprises an optical fiber used for detecting environment strain change and is characterized in that a jacket of the optical fiber is shaped as a hollow tube, the pipe wall of the jacket of the optical fiber is provided with an opening along the axial direction, and the opening is communicated with an inner cavity of the jacket of the optical fiber; and the optical fiber is fixed in the inner cavity of the jacket of the optical fiber through a plurality of positioning members. According to the invention, influence of the jacket outside the optical fiber to the environment change detection can be avoided, environment strain change, temperature change and gas accumulation in a pipeline can be accurately detected, and pipeline bursting and gas or oil loss in the pipeline are prevented.
Description
Technical field
The present invention relates to a kind of optical fiber, especially a kind of open induction optical fiber belongs to optical fiber induction field.
This kind optical fiber can be long apart from having dense the contact with the outer room environment in the situation, and this kind contact can monitor stress, temperature and chemical reaction.
Background technology
For the measurement of structural strain, what extensively adopt traditionally is strain-ga(u)ge technique, and this is a very proven technique, but its defective is also known altogether.Because what it extracted is electric signal, therefore be easy to be subject to the interference of peripheral electromagnetic field.Moreover, because oil and gas pipeline is short then tens kilometers, long then hundreds of, thousands of kilometer, it to or be buried under the ground, perhaps pass through the depopulated zone of awful weather, the environment of underground humidity, and the impermanence of ambient humidity, temperature changes the electric signal that all foil gauge is gathered and produces greatly and disturb, even wrong information is provided.What is worse, foil gauge only has long (being called " point " formula sensor) about one centimetre, it can only survey the strain variation of extremely narrow one section oil and gas pipes, with respect to oil and gas pipes hundreds of, thousands of kilometers, only survey several sections oil and gas pipes, and miss the detection of most oil and gas pipes; Thousands of foil gauges are installed, and this economically can be extremely expensive, technical also infeasible.
Be accompanied by the development of Fibre Optical Communication Technology, fiber optic sensor technology also arises at the historic moment.What Fibre Optical Sensor was different from that one of distinguishing feature of strain-ga(u)ge technique is that Fibre Optical Sensor extracts is light signal, and Fibre Optical Sensor just can not be subject to the interference of peripheral electromagnetic field like this.Because light signal is to be constrained on transmission in the optical fiber, rugged surroundings not only are not to disturb so on every side, and temperature and strain variation on the oil and gas pipeline that Fibre Optical Sensor can cause surrounding environment change detect.
Existing fiber can't be laid in the pipeline of long distance this kind optical fiber owing to its diameter less than normal, intensity and its fragility, or in the wall of hillside, dam.Existing optical fiber is as passing on communication signal to receiver, the outside of this kind optical fiber is to wrap polyester, nylon, rubber or added metal overcoat, this kind is as the optical fiber of communication apparatus, main consideration is interference, solar heat protection, moistureproof impaired or fracture, yet mainly consider as the optical fiber that detects to be and the contacting of the external world, also have optical fiber essential stretching under applied environment, have at this kind in the situation of tension force, optical fiber can be discovered the variation of stress, temperature and chemical reaction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of open induction optical fiber be provided, can overcome the impact that the outer overcoat of optical fiber detects environmental change,
According to technical scheme provided by the invention, described open induction optical fiber comprises for detection of the optical fiber of environment strain variation, it is characterized in that: described optical fiber overcoat is hollow tubular, be provided with vertically opening on the tube wall of optical fiber overcoat, described opening is communicated with the inner chamber of described optical fiber overcoat; Described optical fiber is fixed in the inner chamber of optical fiber overcoat by several keepers.
Described keeper comprises the first location structure that is used for positioning optical waveguides that is positioned at the keeper axial centre, and be convenient to optical fiber is put into the guide frame of the first location structure, and the second location structure that is used for keeper is positioned at the optical fiber overcoat that is positioned at the keeper edge.
Described the first location structure is pass structure; Described guide frame is trench structure; Described pass structure and trench structure be axially laying along keeper all.
Described the second location structure is the locating surface that is arranged at the peripheral surface of keeper.Described locating surface is the circular orientation face.Described locating surface is roughly identical with the inwall of optical fiber overcoat.
Described keeper is the cylindricality keeper, is provided with at the center of cylindricality keeper for the pilot hole of placing optical fiber, is provided with the axially open that is communicated with pilot hole and the external world at the cylindricality keeper.
Described keeper adopts mixed fibre, rubber or the plastic material of wool fiber, cotton fiber, wool and cotton to make.Described optical fiber overcoat adopts stainless steel, carbon steel, copper, aldary, lead or lead alloy to make.
The impact that the present invention can avoid the outer overcoat of optical fiber that environmental change is detected, the change of the STRESS VARIATION of testing environment, temperature and gas prevent pipeline burst in ducted accumulation accurately, and gas or oily in ducted loss.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of keeper of the present invention.
Embodiment
The invention will be further described below in conjunction with concrete accompanying drawing.
Such as Fig. 1 ~ shown in Figure 2: open induction optical fiber comprises optical fiber 1, optical fiber overcoat 2, keeper 3, pilot hole 4 etc.
The present invention includes the optical fiber 1 for detection of the environment strain variation, it is characterized in that: described optical fiber overcoat 2 is hollow tubular, is provided with vertically opening 6 on the tube wall of optical fiber overcoat 2, and described opening 6 is communicated with the inner chamber of described optical fiber overcoat 2; Described optical fiber 1 is fixed in the inner chamber of optical fiber overcoat 2 by several keepers 3.
Described keeper 3 comprises the first location structure that is used for positioning optical waveguides 1 that is positioned at the keeper axial centre, and be convenient to optical fiber 1 is put into the guide frame of the first location structure, and the second location structure that is used for keeper 3 is positioned at optical fiber overcoat 2 that is positioned at keeper 3 edges.
Described the first location structure is pass structure; Described guide frame is trench structure; Described pass structure and trench structure be axially laying along keeper 3 all.
Described the second location structure is the locating surface that is arranged at the peripheral surface of keeper 3.Described locating surface is the circular orientation face, and described locating surface is roughly identical with the inwall of optical fiber overcoat 2.
Perhaps as shown in Figure 2: described keeper 3 is the cylindricality keeper, is provided with at the center of cylindricality keeper for the pilot hole 4 of placing optical fiber 1, is provided with the axially open 5 that is communicated with pilot hole 4 and the external world at the cylindricality keeper.
Described keeper 4 can adopt mixed fibre, rubber or the plastic material of wool fiber, cotton fiber, wool and cotton to make.Described optical fiber overcoat 2 can adopt stainless steel, carbon steel, copper, aldary, lead or lead alloy to make.
Open induction optical fiber of the present invention adopts has open optical fiber overcoat 2, the impact that can avoid the outer cover of optical fiber that environmental change is detected, the accurately change of the STRESS VARIATION of testing environment, temperature.Open induction optical fiber of the present invention can be used for detecting the burn into oil and gas pipes flexing of oil and gas pipes and the artificial destruction that detects oil and gas pipes.The space accuracy of detection of open induction optical fiber of the present invention is lower than 5 centimetres, and the temperature monitoring scope is-270 ~ 800 ℃, and the strain monitoring scope is-2% ~ 3%, and temperature measurement accuracy is ± 0.1 ℃.
Claims (1)
1. open induction optical fiber, comprise the optical fiber (1) for detection of the environment strain variation, it is characterized in that: described optical fiber overcoat (2) is hollow tubular, be provided with vertically opening (6) on the tube wall of optical fiber overcoat (2), described opening (6) is communicated with the inner chamber of described optical fiber overcoat (2); Described optical fiber (1) is fixed in the inner chamber of optical fiber overcoat (2) by several keepers (3);
Described keeper (3) comprises the first location structure that is used for positioning optical waveguides (1) that is positioned at the keeper axial centre, and be convenient to optical fiber (1) is put into the guide frame of the first location structure, and the second location structure that is used for keeper (3) is positioned at optical fiber overcoat (2) that is positioned at keeper (3) edge;
Described the first location structure is pass structure; Described guide frame is trench structure; Described pass structure and trench structure be axially laying along keeper (3) all;
Described the second location structure is the locating surface that is arranged at the peripheral surface of keeper (3);
Described locating surface is the circular orientation face;
Described locating surface is roughly identical with the inwall of optical fiber overcoat (2);
Described keeper (3) is the cylindricality keeper, is provided with at the center of cylindricality keeper for the pilot hole (4) of placing optical fiber (1), is provided with the axially open (5) that is communicated with pilot hole (4) and the external world at the cylindricality keeper;
Described keeper (4) adopts mixed fibre, rubber or the plastic material of wool fiber, cotton fiber, wool and cotton to make;
Described optical fiber overcoat (2) adopts stainless steel, carbon steel, copper, aldary, lead or lead alloy to make.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201110199779 CN102243347B (en) | 2011-07-16 | 2011-07-16 | Open type induction optical fiber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201110199779 CN102243347B (en) | 2011-07-16 | 2011-07-16 | Open type induction optical fiber |
Publications (2)
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CN102243347A CN102243347A (en) | 2011-11-16 |
CN102243347B true CN102243347B (en) | 2013-01-23 |
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CN 201110199779 Active CN102243347B (en) | 2011-07-16 | 2011-07-16 | Open type induction optical fiber |
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Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2744129A1 (en) * | 1977-09-30 | 1979-04-12 | Siemens Ag | CORE-COAT GLASS FIBER WITH LATERAL COUPLING AREA |
JPH05322690A (en) * | 1992-02-21 | 1993-12-07 | Sumitomo Electric Ind Ltd | Optical fiber for detecting leaked liquid |
US7343770B2 (en) * | 2002-08-16 | 2008-03-18 | Nanoprecision Products, Inc. | Stamping system for manufacturing high tolerance parts |
JP5005363B2 (en) * | 2007-01-16 | 2012-08-22 | 株式会社フジクラ | Fiber optic sensor cable |
US7343074B1 (en) * | 2007-02-27 | 2008-03-11 | Corning Incorporated | Optical waveguide environmental sensor and method of manufacture |
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