CN102384772A - Optical fiber type flow monitoring device - Google Patents
Optical fiber type flow monitoring device Download PDFInfo
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- CN102384772A CN102384772A CN2010102762730A CN201010276273A CN102384772A CN 102384772 A CN102384772 A CN 102384772A CN 2010102762730 A CN2010102762730 A CN 2010102762730A CN 201010276273 A CN201010276273 A CN 201010276273A CN 102384772 A CN102384772 A CN 102384772A
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Abstract
The invention discloses an optical fiber type flow monitoring device based on optical fiber bend loss change. Mainly, a curved shell (4) is connected with a floater (9) in a shell (10), a plurality of transformable teeth are arranged on the two opposite sides in the curved shell (4), and a signal fiber (6) is clamped between the transformable teeth on the two sides. The floater (9) is driven by fluid to move and change the length of the curved shell (4), as a result, the positions of the transformable teeth on the two sides in the curved shell (4) are changed and thereby the curvature of the signal fiber (6) clamped between the transformable teeth on the two sides is changed, so that the microbend loss of the signal fiber (6) is changed, a testing unit (5) detects and transmits the microbend loss change to a processing unit (7), and the processing unit (7) works out the flow of the fluid. The precision of the device is high, the cost is low, and the device can remotely transmit data, is easy to multiplex and network, and has a broad application prospect.
Description
Technical field
The present invention relates to a kind of flow instrument, or rather, relate to a kind of device that utilizes bending loss of optical fiber change-detection flow.
Background technology
Existing float flowmeter is made up of a vertical taper pipe and a float that axially moves up and down along Taper Pipe that enlarges from bottom to top.During annular space that detected fluid forms through Taper Pipe and float from bottom to top, the float top and the bottom produce the power that pressure reduction gives the float rising, when the suffered raising force of float when being dipped in the weight of float in the fluid; Float just rises, and the annular space area between float and the Taper Pipe increases thereupon, and annular space place rate of flow of fluid descends; Float top and the bottom pressure reduction reduces; The raising force that acts on float reduces, and when having only raising force to equal to be immersed in the fluid float weight, float just is stabilized in a certain height.On-the-spot indicator type flowmeter is a flow of reading fluid through the scale on the corresponding Taper Pipe outside surface of the stable height of float.And present digital flowmeter mainly is to obtain the height with magnetic float through being positioned at the outside hall sensor of Taper Pipe; The flow that shows fluid again through processing of circuit; Because the inhomogeneous precision of such flowmeter that makes of magnetic field parameter is not high, its precision receives environment electromagnetics and disturbs.And the flowmeter of the type can only be vertical arrangement, and these have all limited the usable range of such flowmeter.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The present invention provides a kind of optical fibre flowmeter based on bending loss of optical fiber; It is simple in structure, reasonable in design, processing and fabricating is convenient and use-pattern is flexible, highly sensitive, result of use is good, and production, use, maintenance cost are low.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of optical-fiber type flow monitoring device comprises float 9, shell 10; It is characterized in that: an end of shaped form housing 4 is fixed in the shell 10; The other end of shaped form housing 4 is fixed with an end of an auxiliary spring 15, and the other end of auxiliary spring 15 is fixed with float 9, is laid with a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2 in described shaped form gram body 4 inner both sides relatively; Described A side distortion tooth 4-1 and B side distortion tooth 4-2 interleaved are laid; A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in the both sides of signal optical fibre 6, and signal optical fibre 6 connects test cell 5 through extended fiber 1, connects processing unit 7 behind the test cell 5.
When fluid flows through; The length of auxiliary spring 15 and shaped form housing 4 receives the influence of float 9 and changes; The length variations of shaped form housing 4 causes the distance between the distortion tooth of the relative both sides in the shaped form housing 4 to change; The bending curvature that is clamped in relative both sides distortion between cog signal optical fibre 6 is changed; Test cell 5 obtains the length variations of shaped form housing 4 through the variation of detection signal optical fiber 6 internal transmission optical signal powers, and test cell 5 passes to processing unit 7 with detected signal, and processing unit 7 calculates the fluid flow size.
One end of shaped form housing 4 is fixed in the shell 10, and the other end of shaped form housing 4 is fixed with float 9.
One end in said shaped form housing 4, that be held on the signal optical fibre 6 between the two row distortion teeth is mounted with light reflecting device 46, like catoptron or fiber grating.
1 mouthful of the other end of described signal optical fibre 6 and 1X2 shunt 45 is connected, 2 mouthfuls of 1X2 shunt 45 with being connected of test cell 5.
Signal optical fibre 6 in the shaped form housing 4 in the shell 10 more than two or two is connected on an optical fiber.Between any two shaped form housings 4, be mounted with light reflecting device 46, preferred way is the catoptron or the fiber grating of low reflection loss, and fiber grating preferably adopts bragg grating.
The xsect of described shaped form housing 4 is circular for sealing.
Described shaped form housing 4 inside are filled with greasy for preventing water.
Said signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said signal optical fibre also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
The present invention compared with prior art has the following advantages:
1, optical-fiber type flow monitoring device of the present invention, have simple in structure, reasonable in design, use-pattern is flexible, highly sensitive;
2, optical-fiber type flow monitoring device of the present invention, because of based on the fiber microbending loss principle, make this device have anti-electromagnetic interference (EMI), highly sensitive, electrical insulating property good, safe and reliable, corrosion-resistant, can detect, be convenient to plurality of advantages such as multiplexing networking at a distance;
3, optical-fiber type flow monitoring device of the present invention, because the light source that can adopt-luminous power method test, thereby can reduce the cost of test cell 5 significantly, thus the whole cost of this device is reduced significantly, make this device have wide usable range.
4, optical-fiber type flow monitoring device of the present invention; Also can use optical time domain reflectometer (being called for short OTDR) to constitute test cell 5; Detection is connected on a plurality of states that are included in the signal optical fibre 6 in the shaped form housing 4 on the optical fiber; Thereby can be low-cost, accomplish a plurality of different flow monitorings efficiently, make this device in energy savings, save material, the application of aspects such as low-carbon emission, automatic control can realize with lower one-tenth originally.
In sum; The present invention is simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good; And have cost low, can detect, be prone to advantages such as networking is multiplexing at a distance, make device of the present invention have good use prospect.
Through accompanying drawing and embodiment, the technical scheme of invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the present invention's first embodiment.
Fig. 2 is the cross-sectional structure synoptic diagram of shaped form housing 4 in the present invention's first embodiment.
Fig. 3 is the structural representation of the present invention's second embodiment.
Fig. 4 is the structural representation of the present invention's the 3rd embodiment.
Fig. 5 is the structural representation of the present invention's the 4th embodiment.
Description of reference numerals:
| The 1-extended fiber; | Snap ring before the 2-; | Snap ring behind the 3-; |
| 4-shaped form housing; | The 5-test cell; | The 6-signal optical fibre; |
| The 7-processing unit; | The 9-float; | The 10-shell; |
| Back-up ring before the 11-; | Back-up ring behind the 12-; | The 13-guide rod; |
| The 15-auxiliary spring; | The 18-plain washer; | 20-hermetic fiber interface; |
| The 45-1X2 optical branching device; | The 46-light reflecting device; | 4-1-A side distortion tooth; |
| 4-2-B side distortion tooth. |
Embodiment
Embodiment 1
Like Fig. 1, shown in Figure 2, among the present invention, comprise float 9; Shell 10 instead is not fixed with preceding back-up ring 11 and back back-up ring 12 through snap ring before on the inwall of shell 10, having 2 and back snap ring 3, and between two back-up rings, is mounted with guide rod 13; Float 9, auxiliary spring 15 and plain washer 18 are slidingly matched with guide rod 13, and an end of shaped form housing 4 is fixed on the back-up ring 12 of back, and the plain washer 18 that passes through of shaped form housing 4 links together with auxiliary spring 15; One end of auxiliary spring 15 is fixed with float 9; The passage of hermetic fiber interface 20 for the optical fiber turnover arranged on the shell 10, and encapsulant wherein can be materials such as epoxy resin, is laid with a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2 in described shaped form housing 4 inner both sides relatively; Described A side distortion tooth 4-1 and B side distortion tooth 4-2 interleaved are laid; A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in the both sides of signal optical fibre 6, and signal optical fibre 6 connects test cell 5 through extended fiber 1, connects processing unit 7 behind the test cell 5.
When fluid flows through; The length of auxiliary spring 15 and shaped form housing 4 receives the influence of float 9 and changes; The length variations of shaped form housing 4 causes the distance between the distortion tooth of the relative both sides in the shaped form housing 4 to change; The bending curvature that is clamped in relative both sides distortion between cog signal optical fibre 6 is changed; Test cell 5 obtains the length variations of shaped form housing 4 through the variation of detection signal optical fiber 6 internal transmission optical signal powers, and test cell 5 passes to processing unit 7 with detected signal, and processing unit 7 calculates the fluid flow size.
The preferred way of the xsect of described shaped form housing 4 is the annular of a sealing, can prevent the erosion of detected fluid to signal optical fibre 6 like this, simultaneously, in the shaped form housing 4 of sealing, can fill greasy for preventing water, prolongs the serviceable life of signal optical fibre 6.
Said signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said signal optical fibre also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
As shown in Figure 3, in the present embodiment, different with embodiment 1 is: do not have auxiliary spring 15 in the described shell 10, float 9 directly is fixed on an end of shaped form housing 4.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 4; In the present embodiment; Different with embodiment 1 is: have two signal optical fibres 6 in the shaped form housing 4 to be cascaded through extended fiber 1, form the quasi-distributed optical fiber sensor-based system, be mounted with light reflecting device 46 on the extended fiber 1 between in two shaped form housings 4; Like fiber grating, certainly preferred way is to select the bragg grating of antiradar reflectivity for use.At this moment the preferably use optical time domain reflectometer (OTDR) of test cell 5; Can obtain the variation of any flowmeter through the test curve of optical time domain reflectometer; Further can highly reflect the variation of the flowmeter of these light reflecting device 46 fronts, thereby further improve measuring accuracy through the light reflection of measuring light reflection unit 46.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 5; In the present embodiment; Different with embodiment 1 is: an end of described signal optical fibre 6 is mounted with light reflecting device 46, and the other end of signal optical fibre 6 connects 1 mouthful of a 1X2 optical branching device 45 through extended fiber 1, and 2 mouthfuls of 1X2 optical branching device 45 connect test cell 5.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (10)
1. optical-fiber type flow monitoring device; Comprise float (9); Shell (10) is characterized in that: an end of shaped form housing (4) is fixed in the shell (10), and an end of the other end of shaped form housing (4) and auxiliary spring (15) links together; The other end of auxiliary spring (15) is fixed with float (9); Be laid with a plurality of A side distortion teeth (4-1) and a plurality of B side distortion tooth (4-2) in the inner relative both sides of described shaped form housing (4), described A side distortion tooth (4-1) and B side distortion tooth (4-2) interleaved are laid, and A side distortion tooth (4-1) and B side distortion tooth (4-2) correspondence are laid in the both sides of signal optical fibre (6); Signal optical fibre (6) connects test cell (5) through extended fiber (1), connects processing unit (7) behind the test cell (5).
2. according to the described optical-fiber type flow monitoring of claim 1 device, it is characterized in that: an end of shaped form housing (4) is fixed in the shell (10), and the other end of shaped form housing (4) is fixed with float (9).
3. according to the described optical-fiber type flow monitoring of claim 1 device, it is characterized in that: be positioned at an end said shaped form housing (4), that be held on the signal optical fibre (6) between the two row distortion teeth and be mounted with light reflecting device (46).
4. according to the described optical-fiber type flow monitoring of claim 3 device, it is characterized in that: 1 mouthful of the other end of described signal optical fibre (6) and 1X2 shunt (45) is connected, 2 mouthfuls of 1X2 shunt (45) with being connected of test cell (5).
5. according to the described optical-fiber type flow monitoring of claim 1 device, it is characterized in that: the signal optical fibre (6) in the shaped form housing (4) in the individual or shell more than two (10) is connected on an optical fiber.
6. according to the described optical-fiber type flow monitoring of claim 5 device, it is characterized in that: between any two shaped form housings (4), be mounted with light reflecting device (46).
7. according to the described optical-fiber type flow monitoring of claim 6 device, it is characterized in that: described light reflecting device (46) is the bragg grating of low reflection coefficient.
8. according to the described optical-fiber type flow monitoring of claim 1 device, it is characterized in that: the xsect of shaped form housing (4) is circular for sealing.
9. according to the described optical-fiber type flow monitoring of claim 8 device, it is characterized in that: shaped form housing (4) inside is filled with greasy for preventing water.
10. according to the described optical-fiber type flow monitoring of claim 1 device, it is characterized in that: said signal optical fibre (6) is plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102762730A CN102384772A (en) | 2010-08-25 | 2010-08-25 | Optical fiber type flow monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102762730A CN102384772A (en) | 2010-08-25 | 2010-08-25 | Optical fiber type flow monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102384772A true CN102384772A (en) | 2012-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102762730A Pending CN102384772A (en) | 2010-08-25 | 2010-08-25 | Optical fiber type flow monitoring device |
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| CN (1) | CN102384772A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162748A (en) * | 2013-02-04 | 2013-06-19 | 中国科学院半导体研究所 | Optical floater flowmeter |
| CN111678455A (en) * | 2020-07-16 | 2020-09-18 | 山东舜感光电科技有限公司 | Memorable metal optical fiber strain sensor |
-
2010
- 2010-08-25 CN CN2010102762730A patent/CN102384772A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162748A (en) * | 2013-02-04 | 2013-06-19 | 中国科学院半导体研究所 | Optical floater flowmeter |
| CN103162748B (en) * | 2013-02-04 | 2016-01-20 | 中国科学院半导体研究所 | A kind of optical floater flowmeter |
| CN111678455A (en) * | 2020-07-16 | 2020-09-18 | 山东舜感光电科技有限公司 | Memorable metal optical fiber strain sensor |
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Application publication date: 20120321 |