CN109945902A - A kind of fibre optical sensor, production mold and production method - Google Patents
A kind of fibre optical sensor, production mold and production method Download PDFInfo
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- CN109945902A CN109945902A CN201910299021.0A CN201910299021A CN109945902A CN 109945902 A CN109945902 A CN 109945902A CN 201910299021 A CN201910299021 A CN 201910299021A CN 109945902 A CN109945902 A CN 109945902A
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- 239000000835 fiber Substances 0.000 title claims abstract description 40
- 230000003287 optical effect Effects 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000741 silica gel Substances 0.000 claims abstract description 30
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims description 54
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000004083 survival effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of fibre optical sensor, production mold and production method, fibre optical sensor uses helical structure, is aided with silica gel and thermal conductive metal plate protection, can improve the spatial resolution of measuring system in the case where (FBG) demodulator resolution ratio is constant；It is simple to make mould structure, the first pit and spiral boss cooperation, first groove and second groove are staggered up and down, facilitate and uniformly produce consistent, compact-sized, the rationally distributed fibre optical sensor of specification；For production method based on making mold, process is simple and reliable.The invention is used for distributed sensor field.
Description
Technical field
The present invention relates to distributed sensor fields, structure and its production work more particularly to a kind of fibre optical sensor
Skill.
Background technique
Physical quantity on optical fiber is such as: temperature, strain variation will lead to the change of optic fibre characteristic so that in optical fiber
The light wave of transmission scatters.The variation scattered by detection system detection light, to realize to physical quantitys such as strain, temperature
Measurement.
Fibre optical sensor has the advantage that 1, optical fiber has electromagnetism interference, anti-lightning strike, waterproof, moisture-proof, anticorrosive etc.
Feature is suitable for underwater, humidity, has some conditions such as electromagnetic interference than relatively rugged environment, has compared to metal sensor
Stronger durability；2, optical fiber itself is both sensor and signal transmission passage, is easier to realize long range, distributed prison
It surveys；3, fibre optical sensor itself is light thin soft and slender, small in size, light-weight, convenient for laying installation, material property to embedded position and
Mechanics parameter influence is smaller, can go deep into inside monitoring of structures, can expand monitoring range.Just because of these advantages, so that
Fibre optical sensor obtains more more and more universal application.But there are also disadvantages for optical fiber, and the small matter of optical fiber diameter is crisp, it is easy to fracture, institute
Should be protected for the optical fiber in engineer application, the structure of protection, and need as far as possible on the premise of ensuring performance into
Row optimization.
A technical indicator most important for distributed fiberoptic sensor is spatial resolution, it is more than distance and sky
Between concept, also decide whether accurately differentiate local message and measurement accuracy.Spatial resolution is smaller, to the quick of local anomaly
Sensitivity is higher, and measurement accuracy is higher.
Based on the above issues, " distribution type fiber-optic Brillouin strain and temperature biography that patent of invention number is CN102620856A
Sensor " provide it is a kind of based on BOTDA distribution type fiber-optic Brillouin strain and temperature sensor, use two distributed feedbacks
Laser is solved as pump laser and detecting laser, this distributed sensor based on distributed feedback laser
The deficiency of system before can produce the spatial resolution of 1m." the distribution type fiber-optic biography that patent of invention number is CN102227615A
Sensor " it include Brillouin's measuring unit, Rayleigh measuring unit, computing unit.To can concurrently and independently be divided with high spatial
Resolution measures the strain of measurement object and temperature.Patent of invention number is a kind of " distribution type fiber-optic of CN103335668A
Temperature strain measurement method " principle of having combined Raman scattering and Brillouin scattering, strain high-resolution is realized in temperature plateau area
Rate demodulation.
But currently, in the embodiment using the distributed fiberoptic sensor thermometric based on BOTDA to break through space point
Rare report in terms of the limitation of resolution, in terms of the content of spatial resolution focuses more on the improvement of sensing system.
If can be under the premise of guaranteeing optical fiber quality, the total length of extended fiber facilitates the application scenarios for expanding BOTDA.
Summary of the invention
The purpose of the present invention is to provide a kind of fibre optical sensor, production mold and production methods, can be in the model of small size
Interior increase fiber lengths are enclosed, while guaranteeing that the optical fiber structure of this part is reliable and stable.
The technical solution used in the present invention is:
A kind of fibre optical sensor, including optical fiber, optical fiber gradually finally cross optical fiber in spiral to rotation center screw-pinch
The helical structure formed in the process extends outwardly, and the surrounding of optical fiber is wrapped up by silica gel structure, and the part of the surface of silica gel structure is equipped with
Thermal conductive metal plate.
As an improvement of the above scheme, the inner ring diameter of optical fiber is not less than 30mm, and screw pitch is 2~5mm.
As an improvement of the above scheme, silica gel structure is flake, is seen with overlooking, and silica gel structure is round or prismatic, is led
Thermometal piece is fitted in the side of silica gel structure maximum area.
As an improvement of the above scheme, thermal conductive metal plate is film-form, and thermal coefficient is greater than 200W/ (m DEG C).
A kind of production mold making above-mentioned fibre optical sensor, including pedestal and spiral salient, pedestal are equipped with the first pit,
The side wall of pedestal is equipped with notch and is removably disposed gate in the gap position, and gate temporarily blocks notch, and spiral salient is solid
It is scheduled in the first pit, the depth of the first pit is greater than the height of spiral salient, spiral salient for variable diameters helical structure, spiral shell
Rotation protrusion has outer end and the endpoint location of inner end two, and outer end is located at base edge, and inner end is located on pedestal, spiral salient it is upper
End face is equipped with first groove along the hand of spiral of itself, and spiral salient and pedestal are equipped with the at the position of face inner end tangent line
Two grooves, the depth of second groove are greater than first groove, and first groove and second groove storage optical fiber make on one section of optical fiber simultaneously
Under be staggered, be uniformly provided with several second dimples on spiral salient, the length of second dimple is less than first groove, the depth of second dimple
Degree and width are all larger than first groove.
As an improvement of the above scheme, the inner ring diameter of first groove is not less than 30mm, and screw pitch is 2~5mm, second groove
Width be 0.2~0.4mm.
As an improvement of the above scheme, several second dimples are distributed on the right-angled intersection direction of spiral salient.
As an improvement of the above scheme, the side wall of the pedestal is equipped with notch and is removably disposed lock in the gap position
Door, gate temporarily block the notch.
A kind of production method using above-mentioned production mold, comprising the following steps:
S1. it is put into optical fiber by starting point of second groove, last optical fiber is covered with first groove, using on closing gate pedestal
Notch；S2. silica gel slowly is injected into the first pit, until the upper surface of the concordant pedestal in the upper surface of silica gel；
S3. silica gel solidification is waited, then slow starting gate is demoulded；
S4. thermal conductive metal plate is pasted in the bottom surface of silica gel after hardening, adaptively cuts the extra heat-conducting metal in edge
Piece.
As an improvement of the above scheme, contain curing agent in silica gel, the ratio of silica gel and curing agent is 50:1, step S3's
The room temperature waiting time is 1~2h.
Beneficial effects of the present invention:
Fibre optical sensor uses helical structure, and the total length of optical fiber can easily exceed the minimum resolution of (FBG) demodulator,
Distribution type fiber-optic and the application scenarios of BOTDA have effectively been expanded, the advantage of distribution type fiber-optic has greatly been played；And the light
Fine temperature sensor can be used for the temperature monitoring that a wide range of electric system and oil tank group etc. easily cause spark occasion.
Fibre optical sensor uses silica gel packaging and thermal conductive metal plate back cover, this structure is effectively protected optical fiber, mentions
Its high survival rate, while becoming the stabilization temperature measuring unit with regular length.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is the stereoscopic schematic diagram for making mold；
Fig. 2 is enlarged diagram when first groove is intersected with second dimple；
Fig. 3 is enlarged diagram when second groove is intersected with pedestal；
Fig. 4 is a kind of schematic diagram of thermometric mode of three fibre optical sensors；
Fig. 5 is the heating temperature-measuring results schematic diagram of the fibre optical sensor in the lower left corner；
Fig. 6 is the heating temperature-measuring results schematic diagram of the fibre optical sensor in the lower right corner；
Fig. 7 is the heating temperature-measuring results schematic diagram of the fibre optical sensor in the upper right corner.
Specific embodiment
Referring to Figure 1 to Figure 7, the present invention is a kind of fibre optical sensor, production mold and preparation method thereof.
A kind of fibre optical sensor, can be used as temperature sensor, mainly include optical fiber and silica gel.Optical fiber is gradually into rotation
Heart screw-pinch finally crosses the helical structure that optical fiber is formed in spiral course and extends outwardly, and this helical structure is also referred to as flat
The concentric variable diameter solid matter distribution in face；This process can also inversely be thought of as optical fiber and be gradually distance from rotation center finally extending outwardly.
The surrounding of optical fiber is wrapped up by silica gel structure, and the part of the surface of silica gel structure is equipped with thermal conductive metal plate.Fibre optical sensor uses silica gel
Encapsulation and thermal conductive metal plate back cover, this structure are effectively protected internal optical fiber, improve its survival rate, while making it
As a stabilization temperature measuring unit with regular length.
Preferably, the inner ring diameter of optical fiber is not less than 30mm, amount of curvature can effectively avoid caused by signal acquisition
It influences.The screw pitch of entire helical structure is 2~5mm.In addition, the fibre optical sensor is mainly for BOTDA system optimization, the spiral
The total length of structure should be more than the minimum resolution of BOTDA.
In order to further reduce the volume of fibre optical sensor, silica gel structure is flake, is seen with overlooking, and silica gel structure is circle
Shape or prismatic.Thermal conductive metal plate is fitted in the side of silica gel structure maximum area, that is, is fitted in cylindrical structure or prism structure
Upper top surface or bottom surface.It is not strict with the side of fibre optical sensor.
In order to guarantee thermal conductive metal plate energy auxiliary heat dissipation, preferably, thermal conductive metal plate is film-form, thermal coefficient is big
In 200W/ (m DEG C).Optional material has red copper or aluminium.
In attached drawing, although the not schematic diagram of fibre optical sensor, it can undoubtedly be calculated according to production mold
Out.
A kind of production mold making above-mentioned fibre optical sensor, including pedestal 1 and spiral salient 2.Pedestal 1 is in middle position
Equipped with the first pit, the side wall of pedestal 1 is equipped with notch 6 and is removably disposed gate 7 in 6 position of notch.Since silica gel has
Toughness and certain shrinkage, in demoulding, optical fiber can be demoulded with silica gel.Wherein the effect of notch 6 is to facilitate the later period
Demoulding, but in order to avoid when injecting glue silica gel overflow, correspondingly increase gate 7, gate 7 temporarily blocks notch 6.
In the present embodiment, connected between gate 7 and notch 6 using inserting mode；Gate 7 is the sheet body of arc, notch 6
Groove is arranged in left and right side edge and bottom, and the right and left of gate 7 is inserted into groove along the vertical direction.
Spiral salient 2 is fixed in the first pit, and the depth of the first pit is greater than the height of spiral salient 2.Spiral salient 2
There is outer end and the endpoint location of inner end two, outer end to be located at 1 edge of pedestal, inner end for for variable diameters helical structure, spiral salient 2
On pedestal 1.The upper surface of spiral salient 2 is equipped with first groove 3 along the hand of spiral of itself, and spiral salient 2 and pedestal 1 are equal
Second groove 4 is equipped at the position of face inner end tangent line, second groove 4 is for drawing optical fiber.The depth of second groove 4 is greater than
First groove 3, first groove 3 and second groove 4 store optical fiber makes one section of optical fiber be staggered up and down simultaneously.First groove 3 and second
Groove 4 designs the optical fiber overlap problem for solving when optical fiber is drawn from inside and outer ring, makes optical fiber layout more specification and compact.
Several second dimples 5 are uniformly provided on spiral salient 2, the length of second dimple 5 is less than first groove 3, and second is recessed
The depth and width in hole 5 are all larger than first groove 3.Optical fiber is in hanging state in the position of second dimple 5 at this time.When injection silicon
When glue, silica gel can penetrate into optical fiber bottom, allow a silica gel annular button formed here, then be effectively fixed at this
Optical fiber.When demolished, above-mentioned button pole is it is effectively guaranteed that the integraty of optical fiber and silica gel, to reach preferably demoulding effect
Fruit.
Preferably, production mold uses metal material, it is made of 3D printing technique.
Preferably, several second dimples 5 are distributed on the right-angled intersection direction of spiral salient 2, multiple in this way second is recessed
Hole 5 can be formed uniformly stress surface on optical fiber, reach better stripping result.
In other embodiments, the first pit is rectangular or prismatic.Preferably, the first pit is made into circle.Pedestal 1
Outer profile is not strict with, but preferably, the outer profile of pedestal 1 is also round.
The layout requirements of corresponding above-mentioned optical fiber, the inner ring diameter of first groove 3 are not less than 30mm, and screw pitch is 2~5mm.
In the present embodiment, production mold use outer diameter for 75mm, internal diameter 65mm, with a thickness of 5mm, cutting-in be 1mm circle
Platform.The inner ring diameter of first groove 3 is 30mm, screw pitch 3mm, and the total length of first groove 3 and second groove 4 is by computer aided manufacturing
Help design to obtain 720mm finally (length has been above BOTDA minimum resolution).The height of spiral salient 2 is 0.5mm, compared with
The cutting-in of first pit lacks 0.5mm, prevents silica gel excessive enough.The size of each second dimple 5 is 0.5x0.5x0.5mm.
The opening width of first groove 3 is 0.3mm, depth 0.15mm；The opening width of second groove 4 is 0.3mm, deep
Degree is 0.4mm.It should be noted that silica gel will not be overflowed here with second groove 4 after second groove 4 is put into optical fiber.
The width of notch 6 is 10mm, and the edge trench depth of notch 6 is 1mm.
A kind of production method using above-mentioned production mold, comprising the following steps:
It S1. is that starting point is put into optical fiber with second groove 4, last optical fiber is covered with first groove 3, prevents when being put into optical fiber
Fiber-optic twist,
The notch 6 on pedestal 1 is closed using gate 7.
S2. silica gel: curing agent=50:1 slowly injects silica gel into first pit, and tool floating silica gel can be used, until
Silica gel it is upper
The upper surface of flush pedestal 1.
S3. 1~2h is waited to solidify to silica gel at normal temperature, then slow starting gate 7 is demoulded.Addition can be passed through
It is appropriate solid
Agent accelerates curing rate.
S4. upper thermal conductive metal plate is pasted in the bottom surface of silica gel after hardening, adaptively cuts the extra thermally conductive gold in edge
Belong to piece.
When in use, fibre optical sensor is pasted on position to be monitored, uses optical fiber splicer between each fibre optical sensor
Carry out welding.FC fibre-optical splice is accessed BOTDA, carried out to instrument parameter by the fibre optical sensor welding FC fibre-optical splice of head and the tail
Setting.Referring in particular to Fig. 4 to Fig. 7, the position that distance is 0m is temperature parameter collection terminal, with the fibre optical sensor in the lower left corner
Fibre optical sensor for #1, the lower right corner is #2, the fibre optical sensor in the upper right corner is #3, is added respectively to the position #1, #2, #3
Heat obtains test result.It can be seen that two measure simultaneously at a distance of closer measuring point, entire measuring system can also be distinguished
Temperature greatly improves the lower problem of existing (FBG) demodulator spatial resolution, and providing for BOTDA short distance point monitoring can
Can, greatly extend the application scenarios of BOTDA.
Above-described embodiment is only representative to be described the principle of the present invention and its effect, but is not to the present invention
It is limited, it will be understood by those skilled in the art that without departing from the spirit and scope of the present invention, to of the invention
Structure and any type of modification are still within the scope of the present invention.
Claims (10)
1. a kind of fibre optical sensor, including optical fiber, it is characterised in that: the optical fiber is gradually finally got over to rotation center screw-pinch
It crosses the helical structure that optical fiber is formed in spiral course to extend outwardly, the surrounding of the optical fiber is wrapped up by silica gel structure, the silicon
The part of the surface of plastic structure is equipped with thermal conductive metal plate.
2. fibre optical sensor according to claim 1, it is characterised in that: the inner ring diameter of the optical fiber is not less than 30mm,
Screw pitch is 2~5mm.
3. fibre optical sensor according to claim 2, it is characterised in that: the silica gel structure is flake, is seen with overlooking,
The silica gel structure is that round or prismatic, the thermal conductive metal plate are fitted in the side of silica gel structure maximum area.
4. fibre optical sensor according to claim 3, it is characterised in that: the thermal conductive metal plate is film-form, thermally conductive
Coefficient is greater than 200W/ (m DEG C).
5. a kind of production mold of production such as any one of claims 1 to 4 fibre optical sensor, it is characterised in that: including pedestal
And spiral salient, the pedestal are equipped with the first pit, the spiral salient is fixed in the first pit, and the depth of the first pit is big
In the height of spiral salient, for variable diameters helical structure, the spiral salient have outer end and inner end two to the spiral salient
A endpoint location, outer end are located at base edge, and inner end is located on pedestal, the spiral side of the upper surface of the spiral salient along itself
To first groove is equipped with, the spiral salient and pedestal are equipped with second groove, the second ditch at the position of face inner end tangent line
The depth of slot is greater than first groove, and first groove and second groove storage optical fiber make one section of optical fiber be staggered up and down simultaneously, the spiral shell
Several second dimples are uniformly provided in rotation protrusion, the length of second dimple is less than first groove, the depth and width of second dimple
It is all larger than first groove.
6. production mold according to claim 5, it is characterised in that: the inner ring diameter of first groove is not less than 30mm, spiral shell
It is 0.2~0.4mm away from the width for 2~5mm, second groove.
7. production mold according to claim 6, it is characterised in that: several second dimples are distributed in the cross of spiral salient
On crisscross.
8. production mold according to claim 7, it is characterised in that: the side wall of the pedestal is equipped with notch and in the notch
Position is removably disposed gate, and gate temporarily blocks the notch.
9. a kind of production method using mold is made such as any one of claim 5 to 8, it is characterised in that including following step
It is rapid:
S1. it is put into optical fiber by starting point of second groove, last optical fiber is covered with first groove, uses lacking on closing gate pedestal
Mouthful；
S2. silica gel slowly is injected into the first pit, until the upper surface of the concordant pedestal in the upper surface of silica gel；
S3. silica gel solidification is waited, then slow starting gate is demoulded；
S4. thermal conductive metal plate is pasted in the bottom surface of silica gel after hardening, adaptively cuts the extra thermal conductive metal plate in edge.
10. manufacturing method according to claim 9, it is characterised in that: contain curing agent in silica gel, silica gel and curing agent
Ratio is 50:1, and the room temperature waiting time of step S3 is 1~2h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299021.0A CN109945902B (en) | 2019-04-15 | 2019-04-15 | Manufacturing die and manufacturing method of optical fiber sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299021.0A CN109945902B (en) | 2019-04-15 | 2019-04-15 | Manufacturing die and manufacturing method of optical fiber sensor |
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| CN109945902A true CN109945902A (en) | 2019-06-28 |
| CN109945902B CN109945902B (en) | 2024-05-31 |
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| CN201910299021.0A Active CN109945902B (en) | 2019-04-15 | 2019-04-15 | Manufacturing die and manufacturing method of optical fiber sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112781514A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting abnormal internal pressure deformation of storage tank |
| CN115027070A (en) * | 2022-06-07 | 2022-09-09 | 北京金诺美科技股份有限公司 | Auxiliary device for manufacturing temperature calibration probe and manufacturing process |
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| Publication number | Publication date |
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| CN109945902B (en) | 2024-05-31 |
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