CN114018303A - Novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force - Google Patents
Novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force Download PDFInfo
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- CN114018303A CN114018303A CN202111300579.XA CN202111300579A CN114018303A CN 114018303 A CN114018303 A CN 114018303A CN 202111300579 A CN202111300579 A CN 202111300579A CN 114018303 A CN114018303 A CN 114018303A
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- 239000000523 sample Substances 0.000 title claims abstract description 36
- 239000000835 fiber Substances 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 16
- 239000003292 glue Substances 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 210000001503 joint Anatomy 0.000 description 9
- 238000001514 detection method Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 239000010985 leather Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
本发明公开了一种用于原位监控水力剪切力的新型光纤布拉格光栅探头，包括由左至右依次连接的一号FC接头、二号FC接头、一号法兰、三号FC接头、中空连接管、四号FC接头、二号法兰、五号FC接头、中空探头管、针头；三号FC接头连接的跳线穿过中空连接管与四号FC接头连接；五号FC接头连接的跳线依次穿过中空探头管、针头，且跳线的端部连接光栅，光栅伸出针头一定长度，采用盖帽对光栅进行保护。本发明通过各部分的组装而达到灵活组装和拆卸的目的，在实际原位监测水力学的过程中，简单方便的组装后便可伸入待测溶液中进行微小空间内水力剪切力的原位监测。
The invention discloses a novel fiber Bragg grating probe used for in-situ monitoring of hydraulic shear force, comprising a No. 1 FC joint, a No. 2 FC joint, a No. 1 flange, a No. 3 FC joint, a No. 1 FC joint, a No. Hollow connecting pipe, No. 4 FC joint, No. 2 flange, No. 5 FC joint, hollow probe tube, needle; The jumper connected by No. 3 FC joint is connected to No. 4 FC joint through the hollow connecting pipe; No. 5 FC joint is connected The jumper wire passes through the hollow probe tube and the needle in turn, and the end of the jumper wire is connected to the grating, the grating extends out of the needle for a certain length, and the grating is protected by a cap. The invention achieves the purpose of flexible assembly and disassembly through the assembly of each part, and in the process of actual in-situ monitoring of hydraulics, after simple and convenient assembly, it can be inserted into the solution to be tested for the original hydraulic shear force in the tiny space. bit monitoring.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a novel fiber Bragg grating probe for in-situ monitoring of a hydraulic shear force state.
Background
The fiber Bragg grating, namely the grating with periodically distributed spatial phases formed in the fiber core, has the advantages of large reflection bandwidth range, small additional loss, small volume, easy coupling with the optical fiber, compatibility with other optical devices, no influence of environmental dust and a series of excellent performances, and is widely applied in the field of optical fiber sensors (measurement of displacement, speed, acceleration and temperature) at present. And moreover, the device is small in size and corrosion-resistant, and can be used for in-situ monitoring of the hydraulic condition of the flow field in the micro space. However, the method is very limited in-situ monitoring of the water environment due to the fragility of the method. Therefore, how to realize the packaging of the fiber bragg grating to adapt to various underwater environments becomes important.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a novel fiber Bragg grating probe for in-situ monitoring of hydraulic shearing force, which comprises a first FC joint, a second FC joint, a first flange, a third FC joint, a hollow connecting pipe, a fourth FC joint, a second flange, a fifth FC joint, a hollow probe pipe and a needle head which are sequentially connected from left to right;
the first FC joint and the second FC joint are connected through jumper wires, the second FC joint and the first flange are connected through threads, the first flange and the third FC joint are connected through threads, the third FC joint and the hollow connecting pipe are connected through AB glue, the hollow connecting pipe and the fourth FC joint are connected through AB glue, the fourth FC joint and the second flange are connected through threads, the second flange and the fifth FC joint are connected through threads, and the fifth FC joint and the hollow probe pipe are connected through AB glue;
the jumper wire connected with the FC joint II penetrates through the hollow connecting pipe to be connected with the FC joint II; the jumper wire that No. five FC connects passes cavity probe pipe, syringe needle in proper order, and the end connection grating of jumper wire, the grating stretches out syringe needle certain length, adopts the block to protect the grating.
The jumper is a protective leather sheath which adopts a plastic leather layer to wrap the bare optical fiber.
The jumper between No. three FC joints and No. four FC joints is welded through the grating welding machine, and the jumper between No. five FC probes and the grating is welded through the grating welding machine.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the assembly design of the invention increases the operability of the Bragg grating in the hydraulics monitoring process.
(2) The invention can customize hollow connecting pipes with different lengths and different materials, and is suitable for testing water environments with different depths.
(3) The invention can be assembled at any time and place, and is simple and easy to implement.
(4) The two hollow probe tube designs of the invention can respectively test the transverse and longitudinal hydraulic changes.
The method improves the problem that the Bragg fiber is easy to break in the actual test process, greatly improves the real-time in-situ monitoring capability of the fiber under the hydraulic state in various environments, and improves the convenience. In the detection process, the multi-point in-situ detection of the solution can be realized. The comprehensiveness and the accuracy of the detection result are improved. The invention has the advantages of low detection cost, light equipment, safe operation and small influence by reaction media, and greatly improves the operability of the device due to the advantages of small volume, corrosion resistance and the like of the Bragg grating.
Drawings
FIG. 1 is a schematic diagram of the assembly scheme of the novel fiber Bragg grating probe of the present invention.
FIG. 2 is a schematic view of the connecting portion of the present invention.
Fig. 3 is a graph showing a change in shear force in real time.
Reference numerals: 1-FC connector No. 1; 2-FC junction No. two; 3-flange number one; 4-FC junction No. three; 5-hollow connecting pipe; 6-number four FC joints; 7-flange II; FC joints 8-five; 9-a hollow probe tube; 10-a needle head; 11-a grating; 12-cap.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the novel fiber bragg grating probe for in-situ monitoring of hydraulic shear force of the invention comprises a first FC connector 1, a second FC connector 2, a first flange 3, a third FC connector 4, a hollow connecting pipe 5, a fourth FC connector 6, a second flange 7, a fifth FC connector 8, a hollow probe tube 9 and a needle 10 which are connected in sequence from left to right.
No. one FC connects 1 and No. two FC and connects 2 through the jumper connection, No. two FC connects 2 and a flange 3 and passes through threaded connection, a flange 3 and No. three FC connect 4 and pass through threaded connection, No. three FC connects 4 and hollow connecting pipe 5 and glues through the AB, hollow connecting pipe 5 and No. four FC connect 6 and glue through the AB and connect, No. four FC connects 6 and No. two flange 7 and passes through threaded connection, No. two flange 7 and No. five FC connect 8 and pass through threaded connection, No. five FC connects 8 and hollow probe pipe 9 and glues through the AB.
The jumper is a protective leather sheath which adopts a plastic leather layer to wrap the bare optical fiber. And a jumper wire connected with the third FC joint 4 penetrates through the hollow connecting pipe 5 to be connected with the fourth FC joint 6. The wire jumper that No. five FC connects 8 to connect passes cavity probe pipe 9, syringe needle 10 in proper order, and the end connection grating 11 of wire jumper, wherein, after the wire jumper that No. five FC connects 8 to connect passes cavity probe pipe 9, need adopt AB glue to fix the wire jumper, and about 4mm is inserted to syringe needle 10 one end to adopt AB glue to bond fixedly, grating 11 stretches out syringe needle 10 certain length, and syringe needle 10 need not additionally to be fixed with grating 11, adopts bonnet 12 to protect grating 11.
Wherein, No. three FC connects the jumper wire between 4 and No. four FC joints 6 and carries out the butt fusion through the grating heat sealing machine, specifically, deepens hollow connecting pipe 5 with No. three FC joints's jumper wire one end earlier until reaching the other end, then carries out the butt fusion through the bare fiber in the grating heat sealing machine in with the jumper wire of No. four FC joints 6 ends bare fiber in the butt fusion, and unnecessary jumper wire after the butt fusion is put into in hollow connecting pipe 5. The jumper wire at the end of the five-number FC probe 8 is welded with the optical grating 11 through an optical grating welding machine, and then the jumper wire is inserted into the hollow probe tube 9 until the hollow probe tube passes through the needle head 10, and the extending length of the hollow probe tube can be 10mm (the length of the grid area is used, and the length of the grid area can be adjusted according to the specific length of the grid area).
Wherein, hollow connecting pipe 5 and No. four FC joints 6 are glued through the AB and are connected, specifically, through connecting 6 one end jumper wire with No. four FC and insert hollow connecting pipe 5, then glue AB and inject hollow connecting pipe 5 head recess in, further connect No. four FC 6 with the recess butt joint, and then reach the purpose of encapsulation, like figure 2. The encapsulation of the FC connector No. five 8 and the hollow probe tube 9 is the same as the encapsulation of the hollow connector tube 5 and the FC connector No. four 6.
The five-gauge FC joint 8, the hollow probe tube 9, the needle 10, the grating 11 and the cap 12 form a probe area which can realize the change of the grating angle, and the scheme only provides the grating angles of 0 degree and 90 degrees, but is not limited to the two angles and can be customized according to the actual situation.
Example 1:
the invention is used for a novel fiber Bragg grating probe for in-situ monitoring of hydraulic shearing force, wherein the first FC joint 1 is connected with a fiber Bragg grating demodulator, and the length of a jumper wire between the first FC joint 1 and the second FC joint 2 can be customized, wherein the length is 1 m. The length and the diameter of the hollow connecting pipe 5 can be customized according to practical application, and in order to reduce the influence of the hollow connecting pipe on the hydraulics in the monitoring process, a hollow pipe with the diameter of 10mm at two ends and the diameter of 4mm at the middle part is adopted, and the length is 100mm and 200 mm. The hollow probe tube 9 has a diameter of 4mm and a length of 100 mm. The total length of the needle head 10 is 18mm, the length of the needle tube is 6.5mm, the outer diameter is 0.5mm, the inner diameter is 0.26mm, and the needle head 10 can be adjusted according to actual conditions.
The specific implementation process of the invention comprises the following steps: the first FC joint 1 is connected to a fiber bragg grating demodulator, then signals are further fed back to a computer, and the stress change can be directly presented through matched software, so that the result is shown in figure 3, when the first FC joint is not interfered by external force, the signals are in a stable stage, and after the first FC joint is interfered by the external force, the signals are obviously changed.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (3)
1. A novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force is characterized by comprising a first FC joint (1), a second FC joint (2), a first flange (3), a third FC joint (4), a hollow connecting pipe (5), a fourth FC joint (6), a second flange (7), a fifth FC joint (8), a hollow probe pipe (9) and a needle head (10) which are sequentially connected from left to right;
the first FC joint (1) is connected with the second FC joint (2) through a jumper, the second FC joint (2) is connected with the first flange (3) through threads, the first flange (3) is connected with the third FC joint (4) through threads, the third FC joint (4) is connected with the hollow connecting pipe (5) through AB glue, the hollow connecting pipe (5) is connected with the fourth FC joint (6) through AB glue, the fourth FC joint (6) is connected with the second flange (7) through threads, the second flange (7) is connected with the fifth FC joint (8) through threads, and the fifth FC joint (8) is connected with the hollow probe pipe (9) through AB glue;
the jumper wire connected with the third FC joint (4) penetrates through the hollow connecting pipe (5) to be connected with the fourth FC joint (6); the jumper wire that No. five FC connects (8) to connect passes cavity probe pipe (9), syringe needle (10) in proper order, and the end connection grating (11) of jumper wire, grating (11) stretch out syringe needle (10) certain length, adopt block (12) to protect grating (11).
2. The novel fiber bragg grating probe for in-situ monitoring of hydraulic shear force as claimed in claim 1, wherein the jumper wire is a protective sheath wrapping the bare optical fiber with a plastic sheath.
3. The novel fiber bragg grating probe for in-situ monitoring of the hydraulic condition as claimed in claim 1, wherein the jumper between the FC joint No. three (4) and FC joint No. four (6) is welded by a grating welder, and the jumper between the FC probe No. five (8) and the grating (11) is welded by a grating welder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111300579.XA CN114018303B (en) | 2021-11-04 | 2021-11-04 | A novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear stress |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111300579.XA CN114018303B (en) | 2021-11-04 | 2021-11-04 | A novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear stress |
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| CN114018303A true CN114018303A (en) | 2022-02-08 |
| CN114018303B CN114018303B (en) | 2025-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527296A (en) * | 2022-03-02 | 2022-05-24 | 天津工业大学 | Novel fiber grating probe for in-situ monitoring of fluid state in microchannel |
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| US20020041724A1 (en) * | 2000-09-07 | 2002-04-11 | Erlend Ronnekleiv | Fiber Optic Probes |
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2021
- 2021-11-04 CN CN202111300579.XA patent/CN114018303B/en active Active
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| CN114018303B (en) | 2025-01-21 |
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