CN209783771U - Optical fiber sensor and manufacturing mold - Google Patents
Optical fiber sensor and manufacturing mold Download PDFInfo
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- CN209783771U CN209783771U CN201920511727.4U CN201920511727U CN209783771U CN 209783771 U CN209783771 U CN 209783771U CN 201920511727 U CN201920511727 U CN 201920511727U CN 209783771 U CN209783771 U CN 209783771U
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Abstract
The utility model discloses an optical fiber sensor and a manufacturing mold, wherein the optical fiber sensor adopts a spiral structure, is assisted with silica gel and heat conducting metal sheet protection, and can improve the spatial resolution of a measuring system under the condition that the resolution of a demodulator is not changed; the manufacturing mold is simple in structure, the first concave pits are matched with the spiral bosses, the first grooves and the second grooves are staggered up and down, and the optical fiber sensors which are consistent in specification, compact in structure and reasonable in layout can be conveniently and uniformly produced. This utility model is used for distributed sensor field.
Description
Technical Field
The utility model relates to a distributed sensor field especially relates to an optical fiber sensor's structure and manufacturing process thereof.
Background
Physical quantities on the fiber are as follows: changes in temperature, strain, etc. can cause changes in the properties of the fiber, thereby causing scattering of the light waves transmitted in the fiber. The change of light scattering is detected by a detection system, so that the measurement of physical quantities such as strain, temperature and the like is realized.
The optical fiber sensor has the following advantages: 1. the optical fiber has the characteristics of electromagnetic interference resistance, lightning protection, water resistance, moisture resistance, corrosion resistance and the like, is suitable for environments with severe conditions such as underwater, humidity, electromagnetic interference and the like, and has stronger durability compared with a metal sensor; 2. the optical fiber is a sensor and a signal transmission channel, so that long-distance and distributed monitoring is easy to realize; 3. the optical fiber sensor is light, thin, flexible, small in size and light in weight, is convenient to arrange and install, has small influence on the material performance and mechanical parameters of a buried part, can go deep into the monitoring structure, and can expand the monitoring range. Due to these advantages, fiber optic sensors are finding increasingly popular applications. However, optical fibers also have some disadvantages, such as small diameter, brittle property, and easy breakage, so that the optical fibers in engineering applications need to be optimized as far as possible while ensuring performance, in addition to protecting the structure for protection.
The most important technical index for the distributed optical fiber sensor is spatial resolution, which is not only the concept of distance and space, but also determines whether local information and measurement accuracy can be accurately resolved. The smaller the spatial resolution, the higher the sensitivity to local anomalies and the higher the measurement accuracy.
Based on the above problem, the utility model discloses a "distributed optical fiber brillouin meets an emergency and temperature sensor" that patent number is CN102620856A provides a distributed optical fiber brillouin meets an emergency and temperature sensor based on BOTDA, uses two distributed feedback formula lasers as pumping laser and detection laser, and this kind of distributed sensor based on distributed feedback formula laser has solved the not enough of previous system, can produce 1 m's spatial resolution. The distributed optical fiber sensor with the patent number of CN102227615A comprises a Brillouin measuring unit, a Rayleigh measuring unit and a calculating unit. In order to be able to measure the strain and temperature of the measurement object simultaneously and independently with a high spatial resolution. The utility model discloses a "a distributed optical fiber temperature strain measurement method" of patent number CN103335668A has united the principle of raman scattering and brillouin scattering, realizes the demodulation of meeting an emergency high resolution in the temperature plateau district.
However, at present, there are few reports on the implementation of thermometry using a BOTDA-based distributed fiber optic sensor to break through the limitation of spatial resolution, and the content on spatial resolution is more focused on the improvement of the sensor system. If the total length of the optical fiber can be prolonged on the premise of ensuring the quality of the optical fiber, the method is beneficial to expanding the application scene of the BOTDA.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical fiber sensor and preparation mould can increase optical fiber length at the within range of little volume, guarantees the stable in structure of this part's optic fibre reliable simultaneously.
the utility model adopts the technical proposal that:
The utility model provides an optical fiber sensor, includes optic fibre, and optic fibre crosses the helical structure that optic fibre formed at the spiral in-process outwards to rotation center spiral shrink at last gradually and extends, and the silica gel structure wraps up all around of optic fibre, and the partial surface of silica gel structure is equipped with the heat conduction sheetmetal.
As an improvement of the scheme, the diameter of the inner ring of the optical fiber is not less than 30mm, and the thread pitch is 2-5 mm.
As an improvement of the scheme, the silica gel structure is in a sheet shape, the silica gel structure is in a circular or prismatic shape when viewed from top, and the heat conducting metal sheet is attached to one side of the maximum area of the silica gel structure.
as an improvement of the proposal, the heat conducting metal sheet is a film, and the heat conductivity coefficient is more than 200W/(m.DEG C).
A manufacturing mold for manufacturing the optical fiber sensor comprises a base and a spiral protrusion, wherein the base is provided with a first pit, the side wall of the base is provided with a notch, a gate is detachably arranged at the position of the notch, the notch is temporarily blocked by the gate, the spiral protrusion is fixed in the first pit, the depth of the first pit is larger than the height of the spiral protrusion, the spiral protrusion is of a spiral structure with variable diameter, the spiral protrusion is provided with an outer end point position and an inner end point position, the outer end point position is positioned at the edge of the base, the inner end point position is positioned on the base, the upper end surface of the spiral protrusion is provided with a first groove along the spiral direction of the spiral protrusion, the spiral protrusion and the base are respectively provided with a second groove at the position right opposite to the tangent line of the inner end point, the depth of the second groove is larger than that of the first groove, the first groove and the second groove are used for accommodating optical fibers, the second pit has a depth and a width larger than those of the first groove.
As an improvement of the scheme, the diameter of the inner ring of the first groove is not less than 30mm, the thread pitch is 2-5 mm, and the width of the second groove is 0.2-0.4 mm.
As an improvement of the scheme, a plurality of second pits are distributed in the cross direction of the spiral protrusions.
As an improvement of the scheme, the side wall of the base is provided with a gap, the gate is detachably arranged at the gap, and the gap is temporarily blocked by the gate.
The utility model has the advantages that:
The optical fiber sensor adopts a spiral structure, the total length of the optical fiber can easily exceed the minimum resolution of a demodulator, the application scenes of the distributed optical fiber and the BOTDA are effectively expanded, and the advantages of the distributed optical fiber are greatly exerted; the optical fiber temperature sensor can be used for temperature monitoring in the occasions where sparks are easily caused, such as large-scale power systems and oil tank groups.
The optical fiber sensor is packaged by silica gel and the heat-conducting metal sheet back cover, so that the structure effectively protects the optical fiber, improves the survival rate of the optical fiber, and simultaneously enables the optical fiber sensor to become a stable temperature measuring unit with a fixed length.
drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a schematic perspective view of a production mold;
Fig. 2 is an enlarged schematic view when a first groove crosses a second pit;
FIG. 3 is an enlarged schematic view of the second trench intersecting the base;
FIG. 4 is a schematic diagram of one temperature measurement mode of three fiber optic sensors;
FIG. 5 is a schematic diagram of the heating temperature measurement result of the fiber sensor at the lower left corner;
FIG. 6 is a diagram illustrating the heating temperature measurement result of the optical fiber sensor at the lower right corner;
FIG. 7 is a graph showing the heating temperature measurement result of the optical fiber sensor at the upper right corner.
Detailed Description
Referring to fig. 1 to 7, the present invention relates to an optical fiber sensor, a manufacturing mold and a manufacturing method thereof.
An optical fiber sensor can be used as a temperature sensor and mainly comprises an optical fiber and silica gel. The optical fiber is gradually spirally contracted towards the rotation center and finally extends outwards beyond a spiral structure formed by the optical fiber in the spiral process, and the spiral structure is also called plane concentric variable diameter close-packed distribution; this process can also be reversed to account for the fiber gradually moving away from the center of rotation and finally extending outward. The periphery of the optical fiber is wrapped by the silica gel structure, and a part of the surface of the silica gel structure is provided with a heat-conducting metal sheet. The optical fiber sensor is packaged by silica gel and the heat-conducting metal sheet back cover, so that the structure effectively protects the internal optical fiber, improves the survival rate of the optical fiber, and simultaneously enables the optical fiber sensor to become a stable temperature measuring unit with a fixed length.
Preferably, the diameter of the inner ring of the optical fiber is not less than 30mm, so that the influence of the curvature on signal acquisition can be effectively avoided. The pitch of the whole spiral structure is 2-5 mm. Furthermore, the fiber sensor is optimized primarily for BOTDA systems, and the total length of the helix should exceed the minimum resolution of the BOTDA.
In order to further reduce the volume of the optical fiber sensor, the silica gel structure is in a sheet shape, and the silica gel structure is in a circular shape or a prismatic shape when viewed from the top. The heat-conducting metal sheet is attached to one side of the maximum area of the silica gel structure, namely the upper top surface or the lower bottom surface of the cylindrical structure or the prismatic structure. The side of the fiber optic sensor is not critical.
In order to ensure that the heat-conducting metal sheet can assist in heat dissipation, the heat-conducting metal sheet is preferably in a film shape, and the heat conductivity coefficient of the heat-conducting metal sheet is more than 200W/(m DEG C). An alternative material is copper or aluminium.
In the drawings, although there is no schematic view of the optical fiber sensor, it can be deduced without objection from the manufacturing mold.
A manufacturing die for manufacturing the optical fiber sensor comprises a base 1 and a spiral protrusion 2. The base 1 is provided with a first pit at the middle position, the side wall of the base 1 is provided with a notch 6, and a gate 7 is detachably arranged at the position of the notch 6. Since silica gel has viscosity and certain contractibility, the optical fiber can be demoulded together with the silica gel when demoulded. Wherein the effect of breach 6 is the drawing of patterns that makes things convenient for the later stage, nevertheless silica gel overflows when avoiding the injecting glue, has correspondingly increased gate 7, and breach 6 is blockked up temporarily to gate 7.
In this embodiment, the gate 7 is connected with the notch 6 in an inserting manner; the gate 7 is an arc-shaped sheet body, the left side edge, the right side edge and the bottom of the notch 6 are provided with grooves, and the left side edge and the right side edge of the gate 7 are inserted into the grooves in the up-down direction.
The spiral protrusion 2 is fixed in a first recess having a depth greater than the height of the spiral protrusion 2. The spiral protrusion 2 is of a variable-diameter spiral structure, the spiral protrusion 2 is provided with an outer end and an inner end, the outer end is located at the edge of the base 1, and the inner end is located on the base 1. The upper end face of the spiral protrusion 2 is provided with a first groove 3 along the spiral direction of the spiral protrusion, the spiral protrusion 2 and the base 1 are provided with a second groove 4 at the position just opposite to the inner end tangent line, and the second groove 4 is used for leading out optical fibers. The depth of the second groove 4 is larger than that of the first groove 3, and the first groove 3 and the second groove 4 are used for accommodating optical fibers and enabling a section of optical fibers to be staggered up and down. The first groove 3 and the second groove 4 are designed to solve the problem that the optical fiber is overlapped with the optical fiber on the outer ring when the optical fiber is led out from the inside, so that the optical fiber layout is more standard and compact.
A plurality of second pits 5 are uniformly arranged on the spiral protrusion 2, the length of each second pit 5 is smaller than that of the corresponding first groove 3, and the depth and the width of each second pit 5 are larger than those of the corresponding first groove 3. At this time, the optical fiber is in a suspended state at the position of the second pit 5. When silica gel is injected, it can penetrate to the bottom of the fiber where it forms a loop and then effectively secures the fiber in this location. During demoulding, the buckle extremely effectively ensures the integration of the optical fiber and the silica gel so as to achieve better demoulding effect.
Preferably, the manufacturing mold is made of a metal material by a 3D printing process.
preferably, the plurality of second recesses 5 are distributed in the cross direction of the spiral protrusion 2, so that the plurality of second recesses 5 can uniformly form a stress surface on the optical fiber, thereby achieving a better demolding effect.
In other embodiments, the first recess is square or prismatic. Preferably, the first recess is formed in a circular shape. The outer contour of the base 1 is not critical, but preferably the outer contour of the base 1 is also circular.
Corresponding to the layout requirements of the optical fibers, the diameter of the inner ring of the first groove 3 is not less than 30mm, and the thread pitch is 2-5 mm.
In this embodiment, the manufacturing mold adopts a circular truncated cone with an outer diameter of 75mm, an inner diameter of 65mm, a thickness of 5mm, and a cutting depth of 1 mm. The inner circle of the first groove 3 has a diameter of 30mm and a pitch of 3mm, and the total length of the first groove 3 and the second groove 4 is 720mm (the length is already larger than the BOTDA minimum resolution) calculated by computer aided design. The height of the spiral protrusion 2 is 0.5mm, which is 0.5mm less than the cutting depth of the first concave pit, and is enough to prevent the silica gel from overflowing. The size of each second concave pit 5 is 0.5 x0.5x0.5mm.
The opening width of the first groove 3 is 0.3mm, and the depth is 0.15 mm; the second groove 4 has an opening width of 0.3mm and a depth of 0.4 mm. It should be noted that after the optical fiber is placed in the second groove 4, the silicone rubber does not overflow from the second groove 4.
The width of the notch 6 is 10mm, and the depth of the edge groove of the notch 6 is 1 mm.
A manufacturing method using the manufacturing mold comprises the following steps:
S1, placing optical fibers by taking the second groove 4 as an initial end, and finally, fully distributing the first groove 3 with the optical fibers, preventing the optical fibers from being distorted when the optical fibers are placed, and closing the notch 6 on the base 1 by using the gate 7.
S2, silica gel: and (3) slowly injecting silica gel into the first concave pit until the curing agent is 50:1, and leveling the silica gel by using a tool until the upper surface of the silica gel is flush with the upper surface of the base 1.
S3, waiting for 1-2 h at normal temperature until the silica gel is solidified, and then slowly opening the gate 7 for demolding. The curing speed can be accelerated by adding a proper amount of curing agent.
And S4, adhering a heat-conducting metal sheet to the bottom surface of the cured silica gel, and cutting off redundant heat-conducting metal sheets at the edge adaptively.
When the optical fiber sensor is used, the optical fiber sensors are pasted at the positions to be monitored, and the optical fiber sensors are welded by an optical fiber welding machine. The optical fiber sensors at the head and the tail are welded with the FC optical fiber connectors, the FC optical fiber connectors are connected into the BOTDA, and instrument parameters are set. Specifically referring to fig. 4 to 7, a position with a distance of 0m is a temperature parameter collection terminal, a fiber sensor at the lower left corner is #1, a fiber sensor at the lower right corner is #2, and a fiber sensor at the upper right corner is #3, and the positions #1, #2, and #3 are heated respectively to obtain test results. The two measuring points which are relatively close to each other can be measured simultaneously, the whole measuring system can distinguish the temperature, the problem of low spatial resolution of the existing demodulator is greatly improved, the possibility is provided for BOTDA close-range point monitoring, and the application scene of the BOTDA is greatly expanded.
The above embodiments are merely representative to describe the principles and functions of the present invention, but not to limit the present invention, and those skilled in the art should understand that modifications to the structure and any form of the present invention are still within the protection scope of the present invention without departing from the spirit and scope of the present invention.
Claims (8)
1. A fiber optic sensor comprising an optical fiber, characterized by: optical fiber crosses the helical structure that optical fiber formed at the spiral in-process outward extension at last gradually to the centre of rotation spiral shrink, be wrapped up by the silica gel structure around the optical fiber, the partial surface of silica gel structure is equipped with the heat conduction sheetmetal.
2. the fiber optic sensor of claim 1, wherein: the diameter of the inner ring of the optical fiber is not less than 30mm, and the thread pitch is 2-5 mm.
3. The fiber optic sensor of claim 2, wherein: the silica gel structure is sheet-like, overlooks and looks, the silica gel structure is circular or prismatic, the laminating of heat conduction sheetmetal is in one side of the largest area of silica gel structure.
4. the fiber optic sensor of claim 3, wherein: the heat-conducting metal sheet is a film, and the heat conductivity coefficient of the heat-conducting metal sheet is more than 200W/(m.DEG C).
5. A manufacturing mold for manufacturing the optical fiber sensor according to any one of claims 1 to 4, characterized in that: protruding including base and spiral, the base is equipped with first pit, the spiral is protruding to be fixed in first pit, and the degree of depth of first pit is greater than the bellied height of spiral, the spiral is protruding to become diameter ground helical structure, the spiral is protruding to have two extreme positions in outer end and inner, and the outer end is located the base edge, and the inner is located the base, the bellied up end of spiral is equipped with first slot along the direction of spiral of self, the spiral is protruding and the base all is being equipped with the second slot just to inner tangential position department, and the degree of depth of second slot is greater than first slot, and first slot and second slot are accomodate optic fibre and are made one section optic fibre stagger from top to bottom simultaneously, evenly be equipped with a plurality of second pits in the spiral is protruding, and the length of second pit is less than first slot, and the degree of depth and the width of second pit all are greater than.
6. The production mold according to claim 5, wherein: the diameter of the inner ring of the first groove is not less than 30mm, the thread pitch is 2-5 mm, and the width of the second groove is 0.2-0.4 mm.
7. the production mold according to claim 6, wherein: a plurality of second concave pits are distributed in the cross direction of the spiral protrusions.
8. The production mold according to claim 7, wherein: the lateral wall of base is equipped with the breach and sets up the gate in this breach position detachably, and the gate is stopped up temporarily the breach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920511727.4U CN209783771U (en) | 2019-04-15 | 2019-04-15 | Optical fiber sensor and manufacturing mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920511727.4U CN209783771U (en) | 2019-04-15 | 2019-04-15 | Optical fiber sensor and manufacturing mold |
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| CN209783771U true CN209783771U (en) | 2019-12-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945902A (en) * | 2019-04-15 | 2019-06-28 | 广州大学 | A kind of fibre optical sensor, production mold and production method |
| CN111707613A (en) * | 2020-04-10 | 2020-09-25 | 杭州博日科技有限公司 | Optical fiber mounting seat, PCR optical module and PCR instrument |
| CN112331945A (en) * | 2020-11-05 | 2021-02-05 | 北京国电光宇机电设备有限公司 | Lithium battery and lithium battery pack with temperature measuring device |
| CN112611410A (en) * | 2020-12-08 | 2021-04-06 | 苏州光格科技股份有限公司 | BOTDA system and automatic fiber breaking positioning method thereof |
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2019
- 2019-04-15 CN CN201920511727.4U patent/CN209783771U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945902A (en) * | 2019-04-15 | 2019-06-28 | 广州大学 | A kind of fibre optical sensor, production mold and production method |
| CN111707613A (en) * | 2020-04-10 | 2020-09-25 | 杭州博日科技有限公司 | Optical fiber mounting seat, PCR optical module and PCR instrument |
| CN112331945A (en) * | 2020-11-05 | 2021-02-05 | 北京国电光宇机电设备有限公司 | Lithium battery and lithium battery pack with temperature measuring device |
| CN112331945B (en) * | 2020-11-05 | 2021-12-07 | 北京国电光宇机电设备有限公司 | Lithium battery and lithium battery pack with temperature measuring device |
| CN112611410A (en) * | 2020-12-08 | 2021-04-06 | 苏州光格科技股份有限公司 | BOTDA system and automatic fiber breaking positioning method thereof |
| CN112611410B (en) * | 2020-12-08 | 2022-08-05 | 苏州光格科技股份有限公司 | BOTDA system and automatic fiber breaking positioning method thereof |
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