CN102587893B - Optic fiber temperature pressure sensor and probe thereof - Google Patents
Optic fiber temperature pressure sensor and probe thereof Download PDFInfo
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- CN102587893B CN102587893B CN201210064655.6A CN201210064655A CN102587893B CN 102587893 B CN102587893 B CN 102587893B CN 201210064655 A CN201210064655 A CN 201210064655A CN 102587893 B CN102587893 B CN 102587893B
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses an optic fiber temperature pressure sensor, comprising a main protection sleeve and a main sleeve which is fixedly arranged at one end of the main protection sleeve. The optic fiber temperature pressure sensor is characterized in that two ends of the main sleeve are respectively provided with an optic fiber Fabry-Perot cavity protection sleeve and an optic fiber grating protector; the optic fiber Fabry-Perot cavity protection sleeve is inserted into the main protection sleeve; one end of the optic fiber Fabry-Perot cavity protection sleeve opposite to the main sleeve is fixedly provided with a quartz glass pressure inlet pipe; a mortise is fixedly arranged in the main sleeve; a quartz glass capillary, a first optic fiber section and a second optic fiber section are arranged in the mortise; the first and the second optic fiber sections are inserted from two ends of the quartz glass capillary and then fixed in the quartz glass capillary; the first and second optic fiber sections are spaced from each other in the quartz glass capillary and form the optic fiber Fabry-Perot cavity; and a grating is arranged on the first optic fiber section to serve as an optic fiber temperature sensor.
Description
Technical field
The present invention relates to a kind of optical fiber temperature and pressure sensor and probe thereof.
Background technology
Current China, in the monitoring of thick oil well temperature, pressure, mainly uses electrical type sensor.But thick oil well environment very severe, the high temperature of down-hole, high pressure and liquid gas corrosion easily cause the inefficacy of downhole sensor, electrical type sensor often adopts memory-type to measure, this metering system needs sensor to put into vacuum flask, then put into down-hole, measure in certain hour section, exceeding this time period then must take out sensor from down-hole, otherwise will lose efficacy, and cannot real time on-line monitoring be realized.There are some electrical type sensors to accomplish real time on-line monitoring abroad at present, but when using this sensor measurement, also need sensor to put into vacuum flask, also have the time restriction of measurement simultaneously, long-term real time on-line monitoring cannot be accomplished.
Fibre Optical Sensor, because it adopts quartz glass optical fiber as Sensor core element, so for the tolerance of HTHP and liquid gas corrosion far away higher than electrical type sensor.The Fibre Optical Sensor being applied to well measurement is at present divided into two kinds: fiber-optic grating sensor and optical fiber Fabry Paro cavity sensor.Fiber-optic grating sensor is by making it to sense parameters to be measured to the special package of fiber grating, and measures size and the direction of parameter to be measured by the change of optic fiber grating wavelength, such as temperature, strain, stress, displacement, speed and acceleration etc.The packaged type of fiber grating determines the performance of fiber-optic grating sensor, as certainty of measurement, range, stability, working environment impact, application life etc.The packaged type of current fiber grating generally has two kinds: rubber seal dress and metallization packaged.Rubber seal dress is exactly use glue by mode fixing for grating two ends, and metallization packaged utilizes chemical plating that grating two ends are plated metal level exactly, then utilizes metal level to carry out the mode be welded and fixed.But all can there is obvious creep in high temperature environments through the fiber-optic grating sensor of rubber seal dress and metallization packaged, namely encapsulate fixed point to move, this just causes null offset, has a great impact the precision and stability of sensor, is not suitable for the measurement of oil well environment.Comparatively speaking, optical fiber Fabry Paro cavity sensor core parts at present for well measurement are made up of pure quartz glass, and traditional structure is generally that the mode being filled two single-mode quartz optical fibers by rubber seal or weld encapsulation is fixed in a quartz glass tube.This sensor have high temperature resistant, range is large, precision is high, the advantage such as stability and reproducible, long service life.But, the packaged type of optical fiber Fabry Paro chamber and metal shell is all realize sealing by mode that is gluing or metallization packaged fixing all the time, find in the prolonged application in oil field, these two kinds of connecting modes are also unstable in oil well, be very easy to cause leakage in the position of encapsulation, because at high temperature chemical reaction can be there is with the liquid gas composition in oil well in glue, Ji Yeqicheng branch causes corrosion to glue, liquid gas in oil well will be inner along corrosion location flow sensor, thus cause the damage of optical fiber Fabry Paro cavity sensor and the interruption of Signal transmissions, and the sensor probe of metallization packaged is subject to underground liquid gas corrosion at metallization packaged position, be also easy to reveal.The glass solder adopted in view of glass solder has the features such as high temperature resistant, corrosion-resistant, good seal performance, the preferred plan of optical fiber Fabry Paro cavity sensor encapsulation adopts the mode of glass solder to be fixed together in optical fiber Fabry Paro chamber and sensor metal seal parts.But the material mainly quartz glass in optical fiber Fabry Paro chamber, its coefficient of thermal expansion and metal widely different, when carrying out glass solder, the high temperature of welding position and rapid cooling phenomenon are easy to the damage causing optical fiber Fabry Paro chamber, cause its lost efficacy or cannot withstand high temperatures high pressure.
On the other hand, this packaged type of traditional optical fiber Fabry Paro cavity sensor determines after Sensor core element connects with metal shell non-dismountable, must just can carry out testing and demarcating after complete for sensor overall package, if there is the situation of sensor failure or damage in test and calibration process, then whole sensor must be scrapped, greatly reduce yield rate, extend life cycle of the product.
Summary of the invention
The object of the invention is to provide optical fiber temperature and pressure sensor probe practical under a kind of oil well, adopt the packaging technology of glass solder and the sealing of machinery clamping, there is the features such as radial dimension is little, good airproof performance, certainty of measurement are high, long service life, long term monitoring good stability, and be applicable to the real-time online measuring of all fluid pressures and temperature.The core parts of sensor probe are independent component, can independently carry out testing and demarcating, after connecting, may be used for the measurement of oil well with packed by metal casing.
The technical solution adopted in the present invention is: a kind of optical fiber temperature and pressure sensor probe, it comprises main body protection sleeve and is fixedly installed on the main body sleeve of main body protection sleeve one end, it is characterized in that being fixedly installed optical fiber Fabry Paro chamber protection sleeve and optical fiber grating protecting part respectively at main body sleeve two ends, optical fiber Fabry Paro chamber protection sleeve is inserted in main body protection sleeve;
On the protection sleeve of optical fiber Fabry Paro chamber, one end relative with main body sleeve is fixedly installed quartz glass entrance pressure pipe;
Lock pin is fixedly installed in main body sleeve, be provided with by quartz glass capillary in lock pin and insert from quartz glass capillary two ends and first fiber segment of fixing and the second fiber segment, in quartz glass capillary, keeping the first fiber segment and the second fiber segment composition optical fiber Fabry Paro chamber at interval; Described lock pin is matched in clearance with the fit system between quartz glass capillary and the mode using glass solder to weld seals fixing;
First fiber segment is provided with grating, and grating two ends high-temperature seal adhesive to be bonded on optical fiber grating protecting part and to make described grating keep the bending of certain radian, and is in the free state that do not stress, as fibre optic temperature sensor.
The concrete feature of this programme also has, and intermediate sleeve in the outer surface cover of fibre optic temperature sensor, intermediate sleeve is connected with main body protection sleeve and outer layer sleeve respectively.Described intermediate sleeve has the endoporus that can be held described grating guard member, and described diameter of bore is greater than described grating guard member outside dimension.
Described grating guard member is divided into stem, middle part and afterbody three part, and stem and afterbody are cylindrical, and middle part, for cutting cylindrical, is parallel to its central axis on grating guard member surface and is provided with the elongated slot holding grating.
Main body protection sleeve and intermediate sleeve are fixed by thread connection, and smear high-temperature seal adhesive on screw thread, to guarantee its sealing performance; Intermediate sleeve and outer layer sleeve are fixed by thread connection, and smear high-temperature seal adhesive on screw thread, to guarantee its sealing performance.
Connecting tube is connected with intermediate sleeve and outer layer sleeve simultaneously.The connecting mode of connecting tube and intermediate sleeve and outer layer sleeve is screw thread and compresses mechanical seal and fix; Namely the mechanical seal of screw thread compression is fixing uses clamp nut, and snap ring and cutting ferrule form wedge-type clamping structure.
Described intermediate sleeve, outer layer sleeve and connecting tube, material is stainless steel.Described lock pin material can be metal, pottery or glass.Described lock pin internal diameter is about 0.35mm, and in described lock pin, hole length is about 2mm.The long scope in chamber in the first fiber segment and the second fiber segment end surfaces and optical fiber Fabry Paro chamber is 100 μm ~ 150 μm.
Described quartz glass capillary first fiber segment and the second fiber segment are fixed together by laser weld, and the end face of described two sections of optical fiber is separated by and is formed the certain cavity of length in described capillary tube.Described two sections of optical fiber are single mode quartz glass optical fiber, and the coat of described single mode quartz glass optical fiber is exotic material, as polyimides.Described quartz glass capillary internal diameter about 0.15 ~ 0.2mm, external diameter is about 0.3mm, and material is high-purity quartz glass.
Main body sleeve seals fixing with lock pin by the mode that glass solder welds.Described glass solder is high temp glass solder, and its fusing point is 500 ° of C.
By clamp nut between described main body protection sleeve and main body sleeve, snap ring and cutting ferrule form wedge-type clamping structure, form the mechanical seal of screw thread compression and fix.
Correspondingly with quartz glass entrance pressure pipe in described main body protection sleeve end sidewalls be provided with entrance pressure mouth.
Quartz glass entrance pressure pipe and optical fiber Fabry Paro chamber protection sleeve are welded together by glass solder and realize sealing and fixing.
Described optical fiber Fabry Paro chamber protection sleeve and described main body sleeve are fixed by thread connection, in test, demarcation, encapsulation and use procedure, play the effect protecting described optical fiber Fabry Paro chamber.Described optical fiber grating protecting part and described main body sleeve are threaded connection fixing.Described optical fiber grating protecting part material is invar.
In the protection sleeve of described optical fiber Fabry Paro chamber, when measurement environment is lower than 150 ° of C, the medium that chemical reaction does not occur for silicone oil or other and quartz glass can be filled, as protective medium, simultaneously as pressure transmission medium.When measurement environment is higher than 150 ° of C, do not inject protective medium.
The connecting mode of the wedge-type clamping structure of the formation of described employing clamp nut, snap ring and cutting ferrule, also can as the connecting mode of sensor probe core parts and test and caliberating device.Described sensor probe core parts comprise optical fiber Fabry Paro chamber, lock pin, main body sleeve, optical fiber Fabry Paro chamber protection sleeve, quartz glass entrance pressure pipe and optical fiber grating protecting part.Described Sensor core element as an independently sensor probe use, and can test it and demarcate.
Feature of the present invention and effect: the optical fiber temperature and pressure sensor probe that the present invention proposes all adopts at the position contacted with measuring media glass solder welding manner to carry out sealing and fixes, in view of the material of glass solder, sealing position can the liquid gas corrosion of withstand high temperatures high pressure and down-hole.Through long-term down-hole, experiment proves, sealing position can withstand high temperatures 320 ° of C, high pressure 100Mpa.Fibre optic compression sensor adopts quartz glass capillary as flexible member, adopt lock pin and the quartz glass capillary major diameter fit of diameter of bore 0.35mm, and adopt the high temp glass solder of 500 ° of C fusing points to weld quartz glass capillary and lock pin, solder fusing after welding and be deposited between quartz glass capillary external surface and lock pin bore area, ensure that when high temperature changes, the active force that the change of lock pin internal diameter size produces acts predominantly on glass solder, instead of act directly on quartz glass capillary, thus avoid damage or the leakage of the quartz glass capillary caused because of temperature shock.Further, after welding, reach in the endoporus of 2mm and be filled with glass solder, ensure that the sealing performance under normal temperature and high-temperature condition.Can prove through long-term experiment, the optical fiber Fabry Paro cavity pressure sensor that the present invention proposes can withstand high temperatures high pressure, and certainty of measurement is high, reproducible, long service life.
Fibre optic temperature sensor adopts fiber grating as sensing element; adopt the grating guard member of special construction; be characterized in having a central through hole and one from external surface to the fluting of central through hole; this special construction is convenient to two ends grating being bonded in central through hole; notching construction is convenient to edge perpendicular to centre bore direction; the i.e. encapsulation operation of radial direction; and make grating have the curved space in fluting direction, edge; thus grating can be made to be in the free state do not stressed all the time; certainty of measurement is high, long service life.Fibre optic temperature sensor, i.e. fiber grating, with fibre optic compression sensor, namely optical fiber Fabry Paro chamber, is integrated on sensor probe core parts.Be packaged with optical fiber Fabry Paro chamber protection sleeve outside fibre optic compression sensor, this sleeve plays the effect in transmission of pressure and protection optical fiber Fabry Paro chamber, avoids the damage in optical fiber Fabry Paro chamber when testing, demarcating and encapsulating.Fibre optic temperature sensor adopts the bonding mode of high-temperature seal adhesive to be fixed on optical fiber grating protecting part, and make it slight curving, keep the free state do not stressed, optical fiber grating protecting part is made up of invar, the linear expansion coeffcient of this material levels off to zero, namely its linear dimension can not change along with variations in temperature substantially, this packaged type ensure that fiber grating can not be stressed because of the change in size of optical fiber grating protecting part, namely the centre wavelength of grating can not be changed because being subject to external force, the change of its centre wavelength is only linear with variations in temperature, thus obtain more accurate temperature information.Sensor core element axis and radial dimension little, test, demarcate and encapsulation time simple installation.Sensor probe core parts can as one independently optical fiber temperature and pressure sensor carry out testing and demarcating, filter out qualified sensor probe core parts afterwards, it is made finished product together with packed by metal casing, overcome conventional fiber optic sensors probe testing, demarcate and encapsulation time install complicated, fragile and the shortcoming of core parts cannot be changed after damage, shorten the production cycle, improve yield rate.
Between main body protection sleeve and intermediate sleeve; and between intermediate sleeve and outer layer sleeve; all adopt the connecting mode that the sealing of thread connection gluing is fixing; between connecting tube and intermediate sleeve, and between connecting tube and outer layer sleeve, screw thread is all adopted to compress the fixing connecting mode of mechanical seal; like this; just ensure that sensor probe internal construction does not contact with down-hole adverse circumstances when measuring, in long-term underground survey process, ensure that certainty of measurement and the application life of sensor.
Accompanying drawing explanation
Fig. 1 is optical fiber temperature and pressure sensor of the present invention probe sectional drawing; Fig. 2 is optical fiber temperature and pressure sensor probe core element section figure of the present invention; Fig. 3 is sensor probe core parts of the present invention and metal shell point of attachment sectional drawing, i.e. A portion enlarged drawing in Fig. 1; Fig. 4 is the point of attachment sectional drawing of sensor probe intermediate sleeve of the present invention and outer layer sleeve and connecting tube, the B portion enlarged drawing namely in Fig. 1; Fig. 5 is optical fiber Fabry Paro chamber protection sleeve and quartz glass entrance pressure pipe point of attachment sectional drawing, i.e. the C portion enlarged drawing in Fig. 2 of sensor probe of the present invention; Fig. 6 is the optical fiber Fabry Paro chamber of sensor probe of the present invention and the point of attachment sectional drawing of lock pin, i.e. D portion enlarged drawing in Fig. 2; Fig. 7 is lock pin and the main body sleeve point of attachment sectional drawing of sensor probe of the present invention, i.e. E portion enlarged drawing in Fig. 2; Fig. 8 is the principle assumption diagram in optical fiber Fabry Paro chamber of the present invention; Fig. 9 is the tomograph of fibre optic temperature sensor of the present invention; Figure 10 is that fibre optic compression sensor of the present invention is at 300 ° of C, 30Mpa environment lower 14 hours follow-on test chamber long data figure.
In figure: 1-first fiber segment; 2-fiber grating; 3-optical fiber grating protecting part; 4-first snap ring; 5-first cutting ferrule; 6-first clamp nut; 7-main body sleeve; 8-lock pin; 9-quartz glass capillary; 10-second fiber segment; 11-optical fiber Fabry Paro chamber protection sleeve; 12-quartz glass entrance pressure pipe; 13-main body protection sleeve; 14-entrance pressure mouth; 15-intermediate sleeve; 16-second cutting ferrule; 17-second clamp nut; 18-outer layer sleeve; 19-housing screw; 20-connecting tube; 21-the 3rd snap ring; 22-the 3rd cutting ferrule; 23-second snap ring; 24-pad; 25-pad; 26-pad; 27-first optical fiber coating; 28-pad; 29-pad; 30-second optical fiber coating; 31-first fiber end face; 32-second fiber end face; The gluing contact of 33-; The gluing contact of 34-.
Detailed description of the invention
As illustrated in fig. 1 and 2, a kind of optical fiber temperature and pressure sensor probe, it comprises intermediate sleeve 15, outer layer sleeve 18, connecting tube 20, main body protection sleeve 13 and is fixedly installed on the main body sleeve 7 of main body protection sleeve 13 one end, be fixedly installed optical fiber Fabry Paro chamber protection sleeve 11 and optical fiber grating protecting part 3 respectively at main body sleeve 7 two ends, optical fiber Fabry Paro chamber protection sleeve 11 is inserted in main body protection sleeve 13; On optical fiber Fabry Paro chamber protection sleeve 11, one end relative with main body sleeve 7 is fixedly installed quartz glass entrance pressure pipe 12.
As shown in FIG. 7 and 8, lock pin 8 is fixedly installed in main body sleeve 7, be provided with by quartz glass capillary 9 in lock pin 8 and insert from quartz glass capillary 9 two ends and first fiber segment 1 and second fiber segment 10 of fixing, in quartz glass capillary 9, keeping first fiber segment 1 at interval and the second fiber segment 10 to form optical fiber Fabry Paro chamber.Main body sleeve 7 seals fixing with lock pin 8 by the mode that glass solder welds.Described glass solder is high temp glass solder, and its fusing point is 500 ° of C.
As shown in Figure 6, described lock pin 8 is with matched in clearance between quartz glass capillary 9 and the mode using glass solder to weld seals fixing; Described lock pin 8 material can be metal, pottery or glass.Described lock pin 8 internal diameter is about 0.35mm, and in described lock pin 8, hole length is about 2mm.
As shown in Figure 9; first fiber segment 1 is provided with fiber grating 2; fiber grating 2 two ends high-temperature seal adhesive to be bonded on optical fiber grating protecting part 3 and to make described fiber grating 2 keep the bending of certain radian, and is in the free state that do not stress, as fibre optic temperature sensor.Described grating guard member 3 is divided into stem, middle part and afterbody three part, and stem and afterbody are cylindrical, and middle part is for cutting cylindrical, and be parallel to its central axis on grating guard member 3 surface and be provided with the elongated slot holding grating, width is 1mm.
As shown in Figure 8, described quartz glass capillary 9 and the first fiber segment 1 and the second fiber segment 10 are fixed together by laser weld, and the end face of described two sections of optical fiber is separated by and is formed the certain cavity of length in quartz glass capillary 9.Described first fiber segment 1 and the second fiber segment 10 are single mode quartz glass optical fiber, and the coat of described single mode quartz glass optical fiber is exotic material, as polyimides.Described quartz glass capillary 9 internal diameter about 0.15 ~ 0.2mm, external diameter is about 0.3mm, and material is high-purity quartz glass.
As shown in figs. 1 and 3, wedge-type clamping structure is formed by the first clamp nut 6, first snap ring 4 and the first cutting ferrule 5 between described main body protection sleeve 13 and main body sleeve 7.Shown main body protection sleeve 13 is metal coating shell.
As shown in Figure 1, correspondingly with quartz glass entrance pressure pipe 12 in described main body protection sleeve 13 end sidewalls entrance pressure mouth 14 is provided with.
As shown in Figure 4, quartz glass entrance pressure pipe 12 and optical fiber Fabry Paro chamber protection sleeve 11 are welded together by glass solder and realize sealing and fixing.Described optical fiber Fabry Paro chamber protection sleeve 11 and described main body sleeve 7 are fixed by thread connection, in test, demarcation, encapsulation and use procedure, play the effect protecting described optical fiber Fabry Paro chamber.Described optical fiber grating protecting part 3 is threaded connection fixing with described main body sleeve 7.Described optical fiber grating protecting part 3 material is invar.
In described optical fiber Fabry Paro chamber protection sleeve 11, when measurement environment is lower than 150 ° of C, the medium that chemical reaction does not occur for silicone oil or other and quartz glass can be filled, as protective medium, simultaneously as pressure transmission medium.When measurement environment is higher than 150 ° of C, do not inject protective medium.
The structure in optical fiber Fabry Paro chamber as shown in Figure 7, comprises one section of quartz glass capillary 9, first fiber segment 1 and the second fiber segment 10, and in this application embodiment, quartz glass capillary internal diameter 0.15 ~ 0.2mm, external diameter is about 0.3mm.First the coat 27 and 30 of the first fiber segment 1 and second fiber segment 10 one end is divested, the mode of cutter cutting or grinding is adopted to process level and smooth end face 31 and 32, then the first fiber segment 1 and the second fiber segment 10 are inserted from the two ends of quartz glass capillary 9 respectively and passed through Laser Welding contact 28, 29 places are fixed together, the end face 31 and 32 of the first fiber segment 1 and the second fiber segment 10 is separated by and is formed the certain cavity of length in quartz glass capillary 9, i.e. optical fiber Fabry Paro chamber, the chamber that the distance of this section of cavity is optical fiber Fabry Paro chamber is long, in this application example, the scope that the chamber in optical fiber Fabry Paro chamber is long is 100 μm ~ 150 μm.When outside pressure acts on quartz glass capillary 9, the axial length change of quartz glass capillary 9 changes linear with outside pressure, the axial length change of quartz glass capillary 9 is linear with the change of cavity length in optical fiber Fabry Paro chamber, and namely the change of cavity length in optical fiber Fabry Paro chamber and outside pressure change linear.
Outside (FBG) demodulator sends light beam signal, optical fiber Fabry Paro chamber is delivered to by the first fiber segment 1, this optical signal is reflected back the first fiber segment 1 by the second fiber segment 10, transmit back outside (FBG) demodulator, thus obtain the chamber long message in optical fiber Fabry Paro chamber, outside pressure change information can be obtained by the change of cavity length information of monitoring optical fiber Fabry Paro chamber.
When measuring, importing external fluid medium by entrance pressure mouth 14, transferring the pressure to optical fiber Fabry Paro chamber, realize measuring.
The optical fiber Fabry Paro cavity pressure sensor that the present invention proposes is at 300 ° of C, the chamber long data change of 30Mpa environment lower 14 hours follow-on tests as shown in Figure 9, this pressure sensor pressure measxurement coefficient is 354nm/Mpa, range 0-100Mpa, as can be seen from data shown in Fig. 9, the present invention proposes the long variation error of optical fiber Fabry Paro cavity pressure sensor cavity and is less than 5nm, namely pressure measurement errors is less than 0.015Mpa, certainty of measurement error is less than 0.02% FS, functional at long term high temperature hyperbaric environment lower seal, without damaging or failure phenomenon, absolutely prove that fibre optic compression sensor that the present invention proposes has precision high, long term high temperature hyperbaric environment lower seal performance is good, application life and the feature such as long-term reliability is good, be particularly useful for measurement environment under the oil well of HTHP.
Claims (8)
1. an optical fiber temperature and pressure sensor probe, it comprises main body protection sleeve and is fixedly installed on the main body sleeve of main body protection sleeve one end, it is characterized in that being fixedly installed optical fiber Fabry Paro chamber protection sleeve and optical fiber grating protecting part respectively at main body sleeve two ends, optical fiber Fabry Paro chamber protection sleeve is inserted in main body protection sleeve;
On the protection sleeve of optical fiber Fabry Paro chamber, one end relative with main body sleeve is fixedly installed quartz glass entrance pressure pipe;
Lock pin is fixedly installed in main body sleeve, be provided with by quartz glass capillary in lock pin and insert from quartz glass capillary two ends and first fiber segment of fixing and the second fiber segment, in quartz glass capillary, keeping the first fiber segment and the second fiber segment composition optical fiber Fabry Paro chamber at interval; Described lock pin is matched in clearance with the fit system between quartz glass capillary and the mode using glass solder to weld seals fixing;
First fiber segment is provided with grating, and grating two ends high-temperature seal adhesive to be bonded on optical fiber grating protecting part and to make described grating keep the bending of certain radian, and is in the free state that do not stress, as fibre optic temperature sensor;
Described grating guard member is divided into stem, middle part and afterbody three part, and stem and afterbody are cylindrical, and middle part, for cutting cylindrical, is parallel to its central axis on grating guard member surface and is provided with the elongated slot holding grating; Described lock pin internal diameter 0.35mm, hole length 2mm in described lock pin; Described quartz glass capillary internal diameter 0.15 ~ 0.2mm, external diameter 0.3mm, material is high-purity quartz glass.
2., according to the optical fiber temperature and pressure sensor probe shown in claim 1, it is characterized in that intermediate sleeve in the outer surface cover of fibre optic temperature sensor, intermediate sleeve is connected with main body protection sleeve and outer layer sleeve respectively.
3., according to the optical fiber temperature and pressure sensor probe shown in claim 1, it is characterized in that main body protection sleeve and intermediate sleeve are fixed by thread connection, and smear high-temperature seal adhesive on screw thread, to guarantee its sealing performance; Intermediate sleeve and outer layer sleeve are fixed by thread connection, and on screw thread, smear high-temperature seal adhesive to guarantee its sealing performance.
4., according to the optical fiber temperature and pressure sensor probe shown in claim 1, it is characterized in that connecting tube is connected with intermediate sleeve and outer layer sleeve simultaneously; The connecting mode of connecting tube and intermediate sleeve and outer layer sleeve is screw thread and compresses mechanical seal and fix; Compress mechanical seal by screw thread between described main body protection sleeve and main body sleeve to fix.
5., according to the optical fiber temperature and pressure sensor probe shown in claim 4, it is characterized in that the mechanical seal of screw thread compression is fixing and namely use clamp nut, snap ring and cutting ferrule form wedge-type clamping structure.
6., according to the optical fiber temperature and pressure sensor probe shown in claim 1, it is characterized in that the long scope in chamber in the first fiber segment and the second fiber segment end surfaces and optical fiber Fabry Paro chamber is 100 μm ~ 150 μm.
7., according to the optical fiber temperature and pressure sensor probe shown in claim 1, it is characterized in that main body sleeve seals fixing with lock pin by the mode that glass solder welds; Quartz glass entrance pressure pipe and optical fiber Fabry Paro chamber protection sleeve are welded together by glass solder and realize sealing and fixing; Described optical fiber Fabry Paro chamber protection sleeve and described main body sleeve are fixed by thread connection, and described optical fiber grating protecting part and described main body sleeve are threaded connection fixing; Described quartz glass capillary and the first fiber segment and the second fiber segment are fixed together by laser weld, and described first fiber segment and the second fiber segment are single mode quartz glass optical fiber, and the coat of single mode quartz glass optical fiber is exotic material polyimides.
8. an optical fiber temperature and pressure sensor, is characterized in that it comprises optical fiber temperature and pressure sensor as claimed in claim 1 probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064655.6A CN102587893B (en) | 2012-03-13 | 2012-03-13 | Optic fiber temperature pressure sensor and probe thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210064655.6A CN102587893B (en) | 2012-03-13 | 2012-03-13 | Optic fiber temperature pressure sensor and probe thereof |
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| CN102587893A CN102587893A (en) | 2012-07-18 |
| CN102587893B true CN102587893B (en) | 2015-04-22 |
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|---|---|---|---|---|
| CN103323924A (en) * | 2013-06-07 | 2013-09-25 | 天津力神电池股份有限公司 | Protective device applicable to penholder-type optical fiber |
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