CN1971226A - Package structure of optical fiber grating temperature sensor - Google Patents
Package structure of optical fiber grating temperature sensor Download PDFInfo
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- CN1971226A CN1971226A CNA200510123773XA CN200510123773A CN1971226A CN 1971226 A CN1971226 A CN 1971226A CN A200510123773X A CNA200510123773X A CN A200510123773XA CN 200510123773 A CN200510123773 A CN 200510123773A CN 1971226 A CN1971226 A CN 1971226A
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Abstract
The invention relates to a capsulation structure of fibre-optical grating temperature sensor that comprises protecting tube, hollow tube, optical fibre connector, the protecting tube is tight coupled with one end of the hollow tube via tube valve element, the other end of the hollow tube is also tight coupled with the optical fibre connector via tube valve element; a bare optical fibre grating carriage is mounted in the protecting tube, it is plastered or welded to the inwall of the protecting tube via its base, the bare optical fibre grating is plastered or welded to the bare optical fibre grating carriage by glue, the transmission optical fibre is connected with the optical fibre connector via the hollow tube, other parts of the bare optical fibre grating carriage except the base are not contacted with the protecting tube, so the optical fibre grating is only under the effect of temperature, the effect of stress to the optical fibre grating is basically eliminated. The fibre-optical grating temperature sensor capsulated in this invention has high stability and reliability; it is easy to be measured in distributed system, it is not sensitive to stress, and it is effective to avoid water logging and hydrogen logging, it is fit for the formidable environment.
Description
Technical field
The present invention relates to the encapsulation technology of a kind of optical fiber Bragg (Bragg) grating temperature sensor, relate in particular to the encapsulating structure of the fiber-optical grating temperature sensor of a kind of suitable oil gas down-hole.
Background technology
Therefore temperature is a crucial parameter of industrial and agricultural production, an inevitable problem that has just become many industrial and agricultural productions department to carry out the ordinary production operation to effective monitoring of temperature.In oil output process, effective, real-time, dynamic, online, distributed monitoring to the producing oil well temperature seem particularly important, by measurement and analysis to temperature, it is dynamic to estimate the producing well payzone, measuring well wall temperature section accurately can also reflect the long-term production characteristic of well in some cases.
Domestic each Oilfield Company all adopts the electronic type instrument to carry out the downhole temperature measurement basically at present.Along with the continuous increase of mining depth and degree, the temperature of oil gas down-hole constantly raises, and long-term work drifting problem, integrity problem will appear in present widely used electronic type thermometric instruments.Develop the restriction that high temperature resistant electronic equipment is subjected to technology and huge input expense, and when measuring, producing well must stop production at every turn, will cause like this to produce and be interrupted, the activity duration reduces, and oil and gas production descends.Borehole operation and production cost are too high in addition, and measurement data can not reflect the down-hole current intelligence real-time, online, dynamically, exactly.Oil-field development and operator can only utilize these " out-of-date ", finite information revises the oil-field development model, formulates development plan, thereby incured loss through delay the opportunity of operation the best, brought tremendous loss to production.
And optical fiber Bragg grating temperature sensor since have high temperature resistant, anticorrosive, anti-interference, down-hole need not electronic section, essential safety, size little, be easy to plurality of advantages such as multiplexing, be very suitable for the long-term measurement of oil gas downhole temperature parameter.By, distributed earth measurement downhole temperature physical parameter real-time, online, dynamic once realizing with optical fiber.But, fracture easily because Fiber Bragg Grating FBG essence is fragile; Have the cross sensitivity problem, i.e. the variation of environment temperature and strain can both cause the drift of Prague (Bragg) centre wavelength; Usually in the Petroleum Production well, Fiber Bragg Grating FBG is operated in the rugged surroundings such as high temperature, high pressure, acid, alkali.Therefore, must seek a kind of effective packaged type, can effectively protect and destressing influence (promptly only allowing grating influenced by temperature factor) encapsulation, guarantee optical fiber Bragg grating temperature sensor long-time operate as normal under rugged surroundings fiber grating.
The encapsulation of existing optical fiber Bragg grating temperature sensor only can not used under the rugged environment relatively, and for example, upper temperature limit is 100 ℃, can not bear pressure, can not acid and alkali-resistance etc., and the shielding of counter stress is also undesirable.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide that a kind of volume is little, simple in structure, stable performance, the influence that can eliminate stress, can bear high pressure, can prevent that optical fiber water logging and hydrogen from soaking, adapting to the encapsulating structure of the optical fiber Bragg grating temperature sensor of rugged surroundings, especially adapts to the encapsulating structure of the Fiber Bragg Grating FBG of rugged surroundings such as high temperature, high pressure, acid, alkali in the Petroleum Production well.
For achieving the above object, the invention provides a kind of encapsulating structure of fiber-optical grating temperature sensor, it comprises protection tube, hollow tube, fiber connector, protection tube is tightly connected by an end of pipe valve and hollow tube, and the other end of hollow tube also is tightly connected by pipe valve and fiber connector; Wherein: the inside at protection tube also is provided with the bare optical fibers and bare optical gratings bracing frame; the base of this bare optical fibers and bare optical gratings bracing frame is fixed on the inwall of protection tube; be fixed with bare optical fibers and bare optical gratings on described bare optical fibers and bare optical gratings bracing frame, its Transmission Fibers part is connected to fiber connector by hollow tube.
In this encapsulating structure, described bare optical fibers and bare optical gratings bracing frame is made of upper, middle, and lower part, and top is for supporting the bare optical fibers and bare optical gratings part, and the bottom is a base, the middle part is for connecting two-part pitman up and down, and its base is pasted mutually with the inwall of protection tube or welded contact; The height of this bare optical fibers and bare optical gratings bracing frame approximates the inside radius of protection tube.The upper support bare optical fibers and bare optical gratings of bare optical fibers and bare optical gratings bracing frame is partly for dull and stereotyped oblong-shaped or with the dull and stereotyped oblong-shaped of a groove or make things convenient for the cylindric of casting glue.The bare optical fibers and bare optical gratings bracing frame can adopt glass or metal material.
The port of the protection tube described in the above-mentioned encapsulating structure also is provided with the protection tube plug, and the Transmission Fibers of bare optical fibers and bare optical gratings is fixed with the protection tube plug in the port of protection tube.The material of protection tube plug is pottery or teflon; The hollow tube of described encapsulating structure is the hollow stainless-steel tube, and the optical fiber ointment is filled in its inside.
In technical scheme of the present invention; bare optical fibers and bare optical gratings sticks with glue or is welded on the bare optical fibers and bare optical gratings bracing frame; the bare optical fibers and bare optical gratings bracing frame is by the inwall of its base stickup or welding protection pipe; and the bare optical fibers and bare optical gratings bracing frame except that base with the protection tube inwall contacts; remainder does not all contact with protection tube; can eliminate the influence of meridional stress fully like this, eliminate the influence of axial stress basically grating to grating.The Transmission Fibers of the temperature sensor of drawing in the protection tube partly with inner hollow stainless-steel tube protection of filling optical fiber with ointment, is tightly connected with pipe valve between stainless-steel tube and the fiber-optical grating temperature sensor protection tube.Also be connected between hollow stainless-steel tube and the special fiber connector by pipe valve.
The encapsulating structure of fiber-optical grating temperature sensor of the present invention has the advantage of many uniquenesses:
1. stability, reliability is high;
2. volume and profile can change according to requirement of engineering;
3. the convenient distributed measurement of arranging net;
4. not affected by force;
5. can bear high pressure;
6. can prevent effectively that water logging, hydrogen from soaking the change to optical properties;
7. be fit to rugged surroundings, the specific (special) requirements that during rugged surroundings thermometrics such as especially suitable oil gas down-hole high temperature, high pressure, acid, alkali fiber-optical grating temperature sensor is encapsulated.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the encapsulating structure synoptic diagram of fiber-optical grating temperature sensor of the present invention.
Among the figure:
1, bare optical fibers and bare optical gratings; 2, bare optical fibers and bare optical gratings bracing frame;
3, protection tube; 4, protection tube plug;
5, pipe valve; 6, fiber connector;
7, hollow tube; 8, span line optical fiber;
9, optical fiber ointment.
Embodiment
Fig. 1 is the encapsulating structure of fiber-optical grating temperature sensor of the present invention; especially be fit to the encapsulating structure of oil gas downhole optic fiber grating temperature sensor, it comprises: bare optical fibers and bare optical gratings 1, protection tube 3, the bare optical fibers and bare optical gratings bracing frame 2 that is not subjected to stress in protection tube 3, hollow tube 7, pipe valve 5, the protection tube plug 4 with a pore, optical fiber ointment 9, fiber connector 6.Bare optical fibers and bare optical gratings 1 sticks with glue or is welded on the top of bare optical fibers and bare optical gratings bracing frame 2; the inwall of protection tube 3 pasted or is welded in by bare optical fibers and bare optical gratings bracing frame 2 by its base; and bare optical fibers and bare optical gratings bracing frame 2 except that base with protection tube 3 inwalls contact, remainder protection tube 3 contacts of all getting along well.The Transmission Fibers of the temperature sensor of drawing in the protection tube 3 partly with inner stainless steel hollow tube 7 protections of filling optical fiber with ointment 9, is tightly connected with pipe valve 5 between stainless steel hollow tube 7 and the fiber-optical grating temperature sensor protection tube 3.Fiber connector 6 is the speciality fiber connector, and its afterbody is connected by pipe valve 5 high pressure sealings with stainless steel hollow tube 7.Be full of optical fiber in the stainless steel hollow tube 7 and can play a protective role to optical fiber, can prevent that again optical fiber generation water logging and hydrogen from soaking with ointment 9.Protection tube plug 4 with a pore can play fixation to optical fiber.By fiber connector 6 a plurality of same optical fiber Bragg grating temperature sensors of can connecting.
According on the engineering to the temperature sensitive property of fiber-optical grating temperature sensor requirement difference, bare optical fibers and bare optical gratings bracing frame 2 useable glass or metal material manufacturing.According on the engineering to the temperature sensitive property of fiber-optical grating temperature sensor requirement difference, the upper support bare optical fibers and bare optical gratings of bare optical fibers and bare optical gratings bracing frame 2 part can be made dull and stereotyped oblong-shaped or with the dull and stereotyped oblong-shaped of a groove or make things convenient for the cylindric of casting glue (can influence the temperature sensitive property of bare optical fibers and bare optical gratings) or other to make things convenient for the shape of casting glue.Bare optical fibers and bare optical gratings bracing frame 2 middle part pitman parts are thin more good more.Pitman can effectively be laid down the power that base passes over like this, and the influence of strain to measurement result eliminated in the effect that causes bare optical fibers and bare optical gratings bracing frame 2 upper support bare optical fibers and bare optical gratings partly not stress basically.Bare optical fibers and bare optical gratings bracing frame 2 bottom bases can be the Any shape that is fit to paste or be welded on protection tube 3 inwalls, for example, and bar-shape, arc, square.
The span line optical fiber 8 of fiber grating is fixing with protection tube plug 4 at the end place of protection tube 3, prevents to move around when optical fiber is subjected to axial stress.Manufacturing materials can be pottery or teflon or other materials.
Span line optical fiber 8 can be the optical fiber of bare fibre and band protective sleeve.Fiber connector 6 is special, and its tail end energy and stainless steel hollow tube 7 are by pipe valve 5 tight seals.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (7)
1, a kind of encapsulating structure of fiber-optical grating temperature sensor, it is characterized in that comprising protection tube (3), hollow tube (7), fiber connector (6), described protection tube (3) is tightly connected by the end of a pipe valve (5) with described hollow tube (7), and the other end of described hollow tube (7) also is tightly connected by a pipe valve (5) and described fiber connector (6); Also be provided with bare optical fibers and bare optical gratings bracing frame (2) in the inside of described protection tube (3); the base of described bare optical fibers and bare optical gratings bracing frame (2) is fixed on the inwall of described protection tube (3); be fixed with bare optical fibers and bare optical gratings (1) on described bare optical fibers and bare optical gratings bracing frame (2), its span line optical fiber (8) is connected to described fiber connector (6) by described hollow tube (7).
2, the encapsulating structure of fiber-optical grating temperature sensor according to claim 1, it is characterized in that described bare optical fibers and bare optical gratings bracing frame (2) is made of upper, middle, and lower part, top is for supporting the bare optical fibers and bare optical gratings part, the bottom is a base, the middle part is for connecting two-part pitman up and down, and its base is pasted mutually with the inwall of described protection tube (3) or welded contact; The height of described bare optical fibers and bare optical gratings bracing frame (2) approximates the inside radius of protection tube (3).
3, the encapsulating structure of fiber-optical grating temperature sensor according to claim 2, the upper support bare optical fibers and bare optical gratings that it is characterized in that described bare optical fibers and bare optical gratings bracing frame (2) are partly for dull and stereotyped oblong-shaped or with the dull and stereotyped oblong-shaped of a groove or make things convenient for the cylindric of casting glue.
4, the encapsulating structure of fiber-optical grating temperature sensor according to claim 1 is characterized in that described bare optical fibers and bare optical gratings bracing frame (2) made by glass or metal material.
5, according to the encapsulating structure of claim 1,2 or 3 described fiber-optical grating temperature sensors; it is characterized in that also being provided with protection tube plug (4) in the port of described protection tube (3), the Transmission Fibers of described bare optical fibers and bare optical gratings (1) is fixing with described protection tube plug (4) in the port of described protection tube (3).
6, the encapsulating structure of fiber-optical grating temperature sensor according to claim 5 is characterized in that the material at described protection tube plug (4) is pottery or teflon.
7, according to the encapsulating structure of claim 1,2 or 3 described fiber-optical grating temperature sensors, it is characterized in that described hollow tube (7) is the hollow stainless-steel tube, the optical fiber ointment is filled in its inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510123773XA CN100498253C (en) | 2005-11-22 | 2005-11-22 | Package structure of optical fiber grating temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510123773XA CN100498253C (en) | 2005-11-22 | 2005-11-22 | Package structure of optical fiber grating temperature sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1971226A true CN1971226A (en) | 2007-05-30 |
| CN100498253C CN100498253C (en) | 2009-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510123773XA Expired - Fee Related CN100498253C (en) | 2005-11-22 | 2005-11-22 | Package structure of optical fiber grating temperature sensor |
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| CN (1) | CN100498253C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324448B (en) * | 2008-07-28 | 2010-06-02 | 西安石油大学 | Encapsulation apparatus for exerting prestress of optical fiber grating sensor |
| CN101879656A (en) * | 2010-06-29 | 2010-11-10 | 南昌大学 | Method for preparing aluminum based intelligent composite material by ultrasonic welding |
| CN101178007B (en) * | 2007-12-07 | 2011-03-02 | 北京蔚蓝仕科技有限公司 | Diaphragm-type optical-fiber intelligent well pressure and temperature sensing unit |
| CN102419349A (en) * | 2011-08-19 | 2012-04-18 | 北京航空航天大学 | Packaging method of acoustic emission sensor of fiber Bragg raster |
| CN102587893A (en) * | 2012-03-13 | 2012-07-18 | 山东省科学院激光研究所 | Optic fiber temperature pressure sensor and probe thereof |
| CN102706479A (en) * | 2012-06-28 | 2012-10-03 | 上海谱蔚物联网有限公司 | Fiber grating temperature sensor with modularized structure |
| CN102722013A (en) * | 2011-03-31 | 2012-10-10 | 北京蔚蓝仕科技有限公司 | Fiber grating bonding method |
| CN103076108A (en) * | 2012-11-26 | 2013-05-01 | 中国电力科学研究院 | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) |
| CN106498843A (en) * | 2016-10-12 | 2017-03-15 | 广西大学 | Intelligent aluminium alloy tendon concrete structure and its making and construction method |
| CN112362115A (en) * | 2020-09-09 | 2021-02-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Small flow sensor based on fiber bragg grating and measuring system |
-
2005
- 2005-11-22 CN CNB200510123773XA patent/CN100498253C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101178007B (en) * | 2007-12-07 | 2011-03-02 | 北京蔚蓝仕科技有限公司 | Diaphragm-type optical-fiber intelligent well pressure and temperature sensing unit |
| CN101324448B (en) * | 2008-07-28 | 2010-06-02 | 西安石油大学 | Encapsulation apparatus for exerting prestress of optical fiber grating sensor |
| CN101879656A (en) * | 2010-06-29 | 2010-11-10 | 南昌大学 | Method for preparing aluminum based intelligent composite material by ultrasonic welding |
| CN102722013A (en) * | 2011-03-31 | 2012-10-10 | 北京蔚蓝仕科技有限公司 | Fiber grating bonding method |
| CN102419349A (en) * | 2011-08-19 | 2012-04-18 | 北京航空航天大学 | Packaging method of acoustic emission sensor of fiber Bragg raster |
| CN102419349B (en) * | 2011-08-19 | 2013-12-11 | 北京航空航天大学 | Packaging method of acoustic emission sensor of fiber Bragg raster |
| CN102587893A (en) * | 2012-03-13 | 2012-07-18 | 山东省科学院激光研究所 | Optic fiber temperature pressure sensor and probe thereof |
| CN102587893B (en) * | 2012-03-13 | 2015-04-22 | 山东省科学院激光研究所 | Optic fiber temperature pressure sensor and probe thereof |
| CN102706479A (en) * | 2012-06-28 | 2012-10-03 | 上海谱蔚物联网有限公司 | Fiber grating temperature sensor with modularized structure |
| CN102706479B (en) * | 2012-06-28 | 2014-10-29 | 上海谱蔚物联网有限公司 | Fiber grating temperature sensor with modularized structure |
| CN103076108A (en) * | 2012-11-26 | 2013-05-01 | 中国电力科学研究院 | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) |
| CN106498843A (en) * | 2016-10-12 | 2017-03-15 | 广西大学 | Intelligent aluminium alloy tendon concrete structure and its making and construction method |
| CN112362115A (en) * | 2020-09-09 | 2021-02-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Small flow sensor based on fiber bragg grating and measuring system |
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| Publication number | Publication date |
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| CN100498253C (en) | 2009-06-10 |
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Granted publication date: 20090610 Termination date: 20091222 |