CN102374913A - Universal pressure sensing device based on optical fiber microbending loss - Google Patents
Universal pressure sensing device based on optical fiber microbending loss Download PDFInfo
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- CN102374913A CN102374913A CN2010102644236A CN201010264423A CN102374913A CN 102374913 A CN102374913 A CN 102374913A CN 2010102644236 A CN2010102644236 A CN 2010102644236A CN 201010264423 A CN201010264423 A CN 201010264423A CN 102374913 A CN102374913 A CN 102374913A
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Abstract
The invention discloses a universal pressure sensing device based on an optical fiber microbending loss, which comprises a cylindrical cavity, wherein one end of the cylindrical cavity is closed by a substrate, and the other end of the cylindrical cavity is fixedly provided with a corrugated piece; and a multi-layer microbending element containing a signal optical fiber is fixedly arranged between the substrate and the corrugated piece. When the tested pressure acts on the corrugated piece, the corrugated piece deforms and transfers the force to the multi-layer microbending element to allow the multi-layer microbending element to be compressed, so that the bending curvature of the signal optical fiber contained in the multi-layer slightly bent element changes, and thus the power of optical signals transmitted in the signal optical fiber is obviously changed, and the pressure is tested by the detection of a testing unit. The multi-layer microbending loss element is adopted, so that the effective length of the signal optical fiber is lengthened, the bending curvature of the signal optical fiber is reduced, and thus the precision of the device is improved, the service life of the signal optical fiber is substantially prolonged simultaneously, and the device has broad application prospects.
Description
Technical field
The present invention relates to a kind of pressure sensor device, especially relate to a kind of universal pressure-sensing device based on the multi-layered type fiber microbending loss.
Background technology
The kind of existing fiber pressure sensor device is more; Mainly comprise polytypes such as light intensity modulation type fibre-optical sensing device, fiber grating pressure sensor device, fiber optic interferometric pressure sensor device; Both characteristics of back are that sensing sensitivity is high; But in the actual application, there are defective and deficiencies such as complex equipments, utilization and operation cost height, thereby make the application of fibre-optical sensing device be very limited.In light intensity modulation type fiber pressure sensing device, mainly contain the reflective or microbending loss formula structure of diaphragm again.The former main defective is that optical fiber is discontinuous in sensing device, has the end-face pollution problem, influences the long-term service precision of this fibre-optical sensing device; Latter's microbending loss formula mainly contains two types, and a kind of is gullet plate cycle microbending loss formula device, two gullet plate arranged parallel through strict processing; And clamping has optical fiber between two parallel gullet plates; The deflection of optical fiber is very little in this device, has only hundreds of microns to cause sensing range little, limits its practicability and range of application; Another kind of type is proposition in the article " based on the fibre optic compression sensor of C type bourdon tube and fiber optic loop " of Chinese patent 93206204.0 " pressure sensing fiber head " and Xi'an University of Technology's journal (2000) Vol.16No.1p.69-73: with fiber reel be about diameter 5-10mm fiber optic loop a few; And be placed between fixed support and the C type bourdon tube through anchor clamps; When having pressure to change; The position of C type bourdon tube has changed the bending curvature of fiber optic loop with respect to support bracket fastened change, cause the bending loss of the optical signal transmission fiber in fiber optic loop to change, through the detection that this bending loss is changed; Can obtain the variation of monitoring pressure; But the fiber optic loop in both devices all requires diameter about 5-10mm, and most optical fiber all has very big crooked internal stress under this bending curvature, and optical fiber can rupture at short notice; Cause the inefficacy of this Fibre Optical Sensor, thereby limited the practical and popularization of such sensor.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The present invention provides a kind of fiber pressure sensing device based on microbending loss; What adopt is the little kinking structure of multilayer fibers, has not only increased the detection distance, and makes this optical fiber detector have long service life, characteristics that precision is high.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of universal pressure-sensing device based on fiber microbending loss; It is characterized in that: comprise a circular cylindrical cavity, an end of described circular cylindrical cavity is that the other end is fixed with corrugated plate by substrate sealing; Between described substrate and corrugated plate, be fixed with the little curved element of the multilayer that comprises signal optical fibre, signal optical fibre joins through extended fiber and test cell.
When being acted on corrugated plate by measuring pressure; Corrugated plate generation microdeformation; The little curved element sensing of multilayer is to the distortion of corrugated plate and the bending curvature that is included in the signal optical fibre in the little curved element of multilayer is changed; Thereby make the optical signal power that is transmitted in the signal optical fibre that significant variation arranged,, reached the size of measuring pressure through the detection of test cell.Owing to adopted the little curved element of multilayer, prolonged the effective length of signal optical fibre, and reduced the bending curvature of signal optical fibre, thereby in the precision that improves this device simultaneously, prolonged the serviceable life of signal optical fibre greatly.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: have a little curved element of multilayer fibers that comprises reference optical fiber to be installed in the circular cylindrical cavity.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the little curved element of described multilayer is to be made up of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the little curved element of described multilayer is that the little curved element that the inner packet by a shaped form contains two row distortion teeth of interlaced correspondence constitutes, and two row distortion between cog accompany signal optical fibre.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the little curved element of described multilayer is to have the little curved element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire by a spring type, and two row distortion between cog accompany signal optical fibre.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: an end of described signal optical fibre is mounted with light reflecting device, like catoptron or fiber grating.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the extended fiber of an end of described signal optical fibre connects 1 end of 1X2 optical branching device, and 2 ends of 1X2 optical branching device connect light source and light power meter respectively.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: circular cylindrical cavity A and interior circular cylindrical cavity B in the inwall edge, upper end of described circular cylindrical cavity and edge, lower end are fixed with respectively again; Lower end at interior circular cylindrical cavity A is mounted with corrugated plate, and the upper end of interior circular cylindrical cavity B is mounted with substrate.The expansion coefficient of circular cylindrical cavity is different with the expansion coefficient of interior circular cylindrical cavity A and interior circular cylindrical cavity B.
Signal optical fibre in two and the little curved element of plural multilayer is cascaded through extended fiber, forms the quasi-distributed optical fiber sensor-based system.
On the extended fiber between two little curved elements of multilayer, be mounted with light reflecting device, like fiber grating.
The adjustment screw rod is arranged on described substrate.
The hole that the balance external and internal pressure is arranged on described substrate.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described signal optical fibre is coated by waterproof material.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described waterproof material is a greasy for preventing water.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: said signal optical fibre 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, based on the universal pressure-sensing device of optical fiber micro-bending, this sensor construction is simple, reasonable in design, method of operating convenient and use-pattern is flexible, highly sensitive;
2, based on the universal pressure-sensing device of optical fiber micro-bending; The little curved element of reason multilayer constitutes; Increase effective bending length of signal optical fibre greatly, increased the precision and the sensitivity that detect on the one hand, and can reduce the bending curvature of signal optical fibre; Thereby prolonged the serviceable life of signal optical fibre, made this optical fiber detector have the characteristics of long service life;
3, based on the universal pressure-sensing device of optical fiber micro-bending owing to adopted multilayer bent forming device, thereby can make this device can respond bigger pressure operating distance, expanded the usable range of this device.
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; Institute has the little curved component structure of multilayer and can reduce the signal optical fibre bending curvature significantly; And the effective length that has prolonged signal optical fibre significantly, make device of the present invention have better precision and longer serviceable life.
Through accompanying drawing and embodiment, the technical scheme of invention is done further detailed description below.
Description of drawings
Fig. 1 is the cut-away section structural representation of the present invention's first embodiment.
Fig. 2 is the cross-sectional view at the main position of the present invention's first embodiment.
Fig. 3 is the cut-away section structural representation of the present invention's second embodiment.
Fig. 4 is the cross-sectional view at the main position of the present invention's second embodiment.
Fig. 5 is the structural representation of the present invention's the 3rd embodiment.
Fig. 6 is the structural representation of the present invention's the 4th embodiment.
Description of reference numerals:
| The 1-extended fiber; | 4-1-is the distortion tooth down; | The last distortion of 4-2-tooth; |
| 4-shaped form housing; | The 5-test cell; | The 6-signal optical fibre; |
| The 7-processing unit; | The 8-spring wire; | |
| The 11-point of fixity; | Circular cylindrical cavity A in the 12- | The 13-corrugated plate; |
| The 14-conductive post; | The 15-substrate; | 16-adjusts screw rod; |
| Circular cylindrical cavity B in the 17-; | The 18-substrate; | The 19-circular cylindrical cavity; |
| The 20-bleeder vent; | The 21-1X2 optical branching device; | The 22-reflective optical system. |
Embodiment
Like Fig. 1, shown in Figure 2; The present invention has a little curved element of multilayer that is made up of shaped form housing 4 that comprises signal optical fibre 6; The following distortion tooth 4-1 and the staggered corresponding also between clamping of last distortion tooth 4-2 of being fixed in the described shaped form housing 4 have signal optical fibre 6; Signal optical fibre 6 is connected with test cell 5 through extended fiber 1; Test cell 5 back connect processing unit 7, are two-layer cavity outside shaped form housing 4, circular cylindrical cavity A12 and interior circular cylindrical cavity B17 in the inwall edge, upper end of circular cylindrical cavity 19 and edge, lower end are fixed with respectively again; Be mounted with corrugated plate 13 in the lower end of interior circular cylindrical cavity A12, the upper end of interior circular cylindrical cavity B17 is mounted with substrate 18.Corrugated plate 13 passes to suffered pressure the shaped form housing 4 that constitutes the little curved element of multilayer through conductive post 14; Thereby the distance that causes being fixed in the following distortion tooth 4-1 in the described shaped form housing 4 and go up between the distortion tooth 4-2 changes; Both are out of shape the bending curvature change of the signal optical fibre 6 between the tooth to make clamping; Cause variation at the optical signal power of signal optical fibre internal transmission; Test cell 5 obtains this variation and this numerical value is passed to processing unit 7 through extended fiber 1, and processing unit calculates the size of pressure.The expansion coefficient of circular cylindrical cavity 19 is different with the expansion coefficient of interior circular cylindrical cavity A12 and interior circular cylindrical cavity B17, and this is typical bridge-type temperature compensation structure, can make this sensing device subdue Influence of Temperature through the material of selecting suitable expansion coefficient.Substrate 15 joins with adjustment screw rod 16, and adjustment screw rod 16 is threaded engagement with the substrate 18 of interior circular cylindrical cavity B17, makes sensing device be in optimum condition through the adjusting of adjusting screw rod 16, and bleeder vent 20 is arranged on the substrate 18.
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 6 also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber; Or many signal optical fibres 6 are clamped in the distortion between cog side by side, or many signal optical fibres 6 are merged into signal optical fibre bundle or signal optical fibre band through resin.
Said signal optical fibre 6 is covered with waterproof material with extended fiber 1 external packets, like waterproofing unction, can further prevent the erosion of hydrone to signal optical fibre 6 and extended fiber 1, has prolonged the serviceable life of signal optical fibre 6 and extended fiber 1.
Embodiment 2
Like Fig. 3, shown in Figure 4, in the present embodiment, different with embodiment 1 is: enclose little curved element is to have the element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire 8 by a spring type more, and two row distortion between cog accompany signal optical fibre 6.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 3
As shown in Figure 5, in the present embodiment, different with embodiment 1 is: be mounted with reflective optical system 22 at an end of signal optical fibre 6; The other end of signal optical fibre 6 is connected with extended fiber 1; Extended fiber 1 connects 1X2 optical branching device 21,2 termination test unit 5 of 1X2 optical branching device 21, and this test cell 5 is to be made up of stabilized light source and light power meter; 2 ends that is to say 1X2 optical branching device 21 connect stabilized light source and light power meter respectively; Test cell 5 is connected with processing unit 7 again, can make twice sweep through signal optical fibre 6 of light signal of transmission in the signal optical fibre 6 like this, the precision and the sensitivity that have further improved this pick-up unit.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 6; In the present embodiment; Different with embodiment 3 is: have two signal optical fibres in the shaped form housing 4 that constitutes the little curved elements of multilayer to be cascaded through extended fiber, form the quasi-distributed optical fiber sensor-based system, be mounted with reflective optical system 22 on the extended fiber between in two shaped form housings 4; Like fiber grating, certainly preferred way is to select the fiber grating of antiradar reflectivity for use.At this moment the preferably use optical time domain reflectometer (OTDR) of test cell 5; Can obtain the pressure variation of any pressure transducer through the test curve of optical time domain reflectometer; Further can reflect the variation of the pressure transducer of these reflective optical system 22 fronts, thereby further improve measuring accuracy through the height of measuring light reverberator 22.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
Constituting the little curved element of many circles also can be to be made up of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern.
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 (11)
1. based on the universal pressure-sensing device of fiber microbending loss; It is characterized in that: comprise a circular cylindrical cavity; One end of described circular cylindrical cavity is to be sealed by a substrate; The other end is fixed with corrugated plate, between described substrate and corrugated plate, is fixed with the little curved element of the multilayer that comprises signal optical fibre, and signal optical fibre joins through extended fiber and test cell.
2. according to the described universal pressure-sensing device of claim 1, it is characterized in that: have a little curved element of multilayer fibers that comprises reference optical fiber to be installed in the circular cylindrical cavity based on fiber microbending loss.
3. according to the described universal pressure-sensing device based on fiber microbending loss of claim 1, it is characterized in that: the little curved element of described multilayer is to be made up of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern.
4. according to the described universal pressure-sensing device of claim 1 based on fiber microbending loss; It is characterized in that: the little curved element of described multilayer is to be made up of a shaped form housing; Inner packet at the shaped form housing contains the little curved element formation that two of interlaced correspondence is listed as the distortion teeth, and two row distortion between cog accompany signal optical fibre.
5. according to the described universal pressure-sensing device of claim 1 based on fiber microbending loss; It is characterized in that: the little curved element of described multilayer is to have the little curved element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire by a spring type, and two row distortion between cog accompany signal optical fibre.
6. according to the described universal pressure-sensing device based on fiber microbending loss of claim 1, it is characterized in that: an end of described signal optical fibre is mounted with reflective optical system, like catoptron or fiber grating.
7. according to the described universal pressure-sensing device based on fiber microbending loss of claim 1, it is characterized in that: the extended fiber of an end of described signal optical fibre connects 1 end of 1X2 optical branching device, and 2 ends of 1X2 optical branching device connect light source and light power meter respectively.
8. according to the described universal pressure-sensing device of claim 1 based on fiber microbending loss; It is characterized in that: circular cylindrical cavity A and interior circular cylindrical cavity B in the inwall edge, upper end of described circular cylindrical cavity and edge, lower end are fixed with respectively again; Lower end at interior circular cylindrical cavity A is mounted with corrugated plate, and the upper end of interior circular cylindrical cavity B is mounted with substrate.
9. according to the described universal pressure-sensing device based on fiber microbending loss of claim 8, it is characterized in that: the expansion coefficient of circular cylindrical cavity is different with the expansion coefficient of interior circular cylindrical cavity A and interior circular cylindrical cavity B.
10. according to the described universal pressure-sensing device based on fiber microbending loss of claim 1, it is characterized in that: the signal optical fibre in two and the little curved element of plural multilayer is cascaded through extended fiber.
11. according to the described universal pressure-sensing device of claim 10, it is characterized in that: on the extended fiber between two little curved elements of multilayer, be mounted with reflective optical system, like fiber grating based on fiber microbending loss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102644236A CN102374913A (en) | 2010-08-17 | 2010-08-17 | Universal pressure sensing device based on optical fiber microbending loss |
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| CN2010102644236A CN102374913A (en) | 2010-08-17 | 2010-08-17 | Universal pressure sensing device based on optical fiber microbending loss |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062049A (en) * | 2014-06-13 | 2014-09-24 | 京东方科技集团股份有限公司 | Substrate detection method and device |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| WO2018210236A1 (en) * | 2017-05-15 | 2018-11-22 | 中兴通讯股份有限公司 | Optical fiber pressure sensor, optical fiber pressure sensing system and method for pressure measurement |
| CN109855761A (en) * | 2018-12-18 | 2019-06-07 | 盐城师范学院 | Electric power low-pressure distribution bus conductor joint heating monitors sensor |
| CN110868250A (en) * | 2018-08-28 | 2020-03-06 | 中国电信股份有限公司 | Method and system for determining relevant information of access equipment |
| CN114674349A (en) * | 2022-03-14 | 2022-06-28 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbend |
-
2010
- 2010-08-17 CN CN2010102644236A patent/CN102374913A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062049A (en) * | 2014-06-13 | 2014-09-24 | 京东方科技集团股份有限公司 | Substrate detection method and device |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| WO2018210236A1 (en) * | 2017-05-15 | 2018-11-22 | 中兴通讯股份有限公司 | Optical fiber pressure sensor, optical fiber pressure sensing system and method for pressure measurement |
| CN108871658A (en) * | 2017-05-15 | 2018-11-23 | 中兴通讯股份有限公司 | Fibre optic compression sensor, fiber-optic pressure sensor system and pressure measurement method |
| CN110868250A (en) * | 2018-08-28 | 2020-03-06 | 中国电信股份有限公司 | Method and system for determining relevant information of access equipment |
| CN109855761A (en) * | 2018-12-18 | 2019-06-07 | 盐城师范学院 | Electric power low-pressure distribution bus conductor joint heating monitors sensor |
| CN109855761B (en) * | 2018-12-18 | 2020-08-14 | 盐城师范学院 | Heating monitoring sensor for electric power low-voltage distribution bus joint |
| CN114674349A (en) * | 2022-03-14 | 2022-06-28 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbend |
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Application publication date: 20120314 |