CN201885836U - General pressure sensing device based on optical fiber microbending loss - Google Patents
General pressure sensing device based on optical fiber microbending loss Download PDFInfo
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- CN201885836U CN201885836U CN2010205070703U CN201020507070U CN201885836U CN 201885836 U CN201885836 U CN 201885836U CN 2010205070703 U CN2010205070703 U CN 2010205070703U CN 201020507070 U CN201020507070 U CN 201020507070U CN 201885836 U CN201885836 U CN 201885836U
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Abstract
The utility model discloses a general pressure sensing device based on optical fiber microbending loss, comprising a cylindrical cavity. One end of the cylindrical cavity is sealed by a substrate, and the other end of the cylindrical cavity is fixedly provided with a corrugated sheet; and a multi-layered microbending element containing signal optical fiber is fixed between the substrate and the corrugated sheet. When the measured pressure acts on the corrugated sheet, the corrugated sheet deforms and transmits the force value to the multi-layered microbending element to cause the multi-layered microbending element to be compressed and lead the bending curvature of the signal optical fiber contained in the multi-layered microbending element to be changed, so that optical signal power transmitted in the signal optical fiber to be obviously changed, and the purpose of measuring the pressure is achieved by detection of a testing unit. As the multi-layered microbending element is adopted, the effective length of the signal optical fiber is prolonged, and the bending curvature of the signal optical fiber is reduced, so that the service life of the signal optical fiber is greatly prolonged simultaneously when the accuracy of the general pressure sensing device is improved, and further the device disclosed by the utility model has wide application prospect.
Description
Technical field
The utility model relates to a kind of pressure sensor device, especially relates 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 sensing sensitivity height, but in the actual application, there are defective and deficiencies such as equipment complexity, 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, there is the end-face pollution problem, influence 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 strictness 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 Chinese patent 93206204.0 " a pressure sensing fiber head ", with propose in the article " based on the fibre optic compression sensor of C type bourdon tube and fiber optic loop " of Xi'an University of Technology's journal (2000) Vol.16 No.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 by 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, by 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 have very big crooked internal stress under this bending curvature, 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 above-mentioned the deficiencies in the prior art, the utility model 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 solution adopted in the utility model is: a kind of universal pressure-sensing device based on 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, be fixed with the little curved element of the multilayer that comprises signal optical fibre between described substrate and corrugated plate, signal optical fibre joins by 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 be arranged, by the detection of test cell, reached the size of measuring pressure.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 utility model 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 utility model solves further technical matters is: the little curved element of described multilayer is to be made 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 utility model solves further technical matters is: the little curved element of described multilayer is that the little curved element that the inside by a shaped form includes 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 utility model 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 utility model solves further technical matters is: an end of described signal optical fibre is mounted with light reflecting device, as catoptron or fiber grating.
The scheme that Fibre Optical Sensor of the present utility model 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 utility model 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 by 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, as 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 utility model solves further technical matters is: described signal optical fibre is coated by waterproof material.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: described waterproof material is a greasy for preventing water.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: described signal optical fibre is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, as tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Described signal optical fibre also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
The utility model 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, increased effective bending length of signal optical fibre greatly, the precision and the sensitivity that detect have been increased 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 utility model 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 utility model have better precision and longer serviceable life.
Below by drawings and Examples, the technical scheme of utility model is described in further detail.
Description of drawings
Fig. 1 is the cut-away section structural representation of the utility model first embodiment.
Fig. 2 is the cross-sectional view at the main position of the utility model first embodiment.
Fig. 3 is the cut-away section structural representation of the utility model second embodiment.
Fig. 4 is the cross-sectional view at the main position of the utility model second embodiment.
Fig. 5 is the structural representation of the utility model the 3rd embodiment.
Fig. 6 is the structural representation of the utility model 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
As Fig. 1, shown in Figure 2, the utility model has a little curved element of multilayer that is made 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 by extended fiber 1, test cell 5 back connect processing unit 7, it outside shaped form housing 4 two-layer cavity, 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 by 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 by 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 Temperature Influence by the material of selecting suitable expansion coefficient.Substrate 15 joins with adjustment screw rod 16, and the substrate 18 of adjusting screw rod 16 and interior circular cylindrical cavity B17 is threaded engagement, makes sensing device be in optimum condition by the adjusting of adjusting screw rod 16, and bleeder vent 20 is arranged on the substrate 18.
Described signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, as tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Described 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 by resin.
Described signal optical fibre 6 and extended fiber 1 external packets are covered with waterproof material, as waterproofing unction, can further prevent the erosion of hydrone to signal optical fibre 6 and extended fiber 1, have prolonged the serviceable life of signal optical fibre 6 and extended fiber 1.
Embodiment 2
As shown in Figure 3, Figure 4, in the present embodiment, as different from Example 1: the little curved element of multi-turn is to have the element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire 8 by a spring type, 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, as different from Example 1: 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, this test cell 5 is to be made 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 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 by signal optical fibre 6.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, as different from Example 3: have two signal optical fibres in the shaped form housing 4 that constitutes the little curved elements of multilayer to be cascaded by 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, as 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 one pressure transducer by 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 by 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 multi-turn also can be to be made 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 utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
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, be fixed with the little curved element of the multilayer that comprises signal optical fibre between described substrate and corrugated plate, signal optical fibre joins by 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 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 of a shaped form housing, the little curved element that includes two row distortion teeth of interlaced correspondence in the inside of shaped form housing constitutes, 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.
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, the upper end of interior circular cylindrical cavity B is mounted with substrate, and 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.
9. 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 by extended fiber.
10. according to the described universal pressure-sensing device of claim 9, it is characterized in that: on the extended fiber between two little curved elements of multilayer, be mounted with reflective optical system based on fiber microbending loss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205070703U CN201885836U (en) | 2010-08-17 | 2010-08-17 | General pressure sensing device based on optical fiber microbending loss |
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| CN2010205070703U CN201885836U (en) | 2010-08-17 | 2010-08-17 | General pressure sensing device based on optical fiber microbending loss |
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| CN201885836U true CN201885836U (en) | 2011-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI457203B (en) * | 2011-09-30 | 2014-10-21 | Hon Hai Prec Ind Co Ltd | Pressure detection device and polish apparatus using the same |
| CN110487390A (en) * | 2019-09-04 | 2019-11-22 | 南昌工程学院 | A kind of distributed fiber-optic sensor monitoring management method |
-
2010
- 2010-08-17 CN CN2010205070703U patent/CN201885836U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI457203B (en) * | 2011-09-30 | 2014-10-21 | Hon Hai Prec Ind Co Ltd | Pressure detection device and polish apparatus using the same |
| CN110487390A (en) * | 2019-09-04 | 2019-11-22 | 南昌工程学院 | A kind of distributed fiber-optic sensor monitoring management method |
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Granted publication date: 20110629 Termination date: 20110817 |