CN101922989A - Fiber pressure sensing device based on C-shaped spring tube - Google Patents
Fiber pressure sensing device based on C-shaped spring tube Download PDFInfo
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- CN101922989A CN101922989A CN2010102256264A CN201010225626A CN101922989A CN 101922989 A CN101922989 A CN 101922989A CN 2010102256264 A CN2010102256264 A CN 2010102256264A CN 201010225626 A CN201010225626 A CN 201010225626A CN 101922989 A CN101922989 A CN 101922989A
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- fiber
- pressure sensing
- bourdon tube
- optical fibre
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Abstract
The invention discloses a fiber pressure sensing device based on a C-shaped spring tube. A multi-layer microbend element containing a signal fiber is installed on the C-shaped spring tube. When the pressure to be measured is applied to the C-shaped spring tube, the C-shaped spring tube has the tendency of rounding and extending, and the extending displacement of the C-shaped spring tube causes the compression of the multi-layer microbend element so that the bending curvature of the signal fiber contained in the multi-layer microbend element is changed, thus the power of optical signals transmitted in the signal fiber is obviously changed, and the purpose of measuring the magnitude of the pressure is achieved by utilizing a testing instrument for detection. Because the multi-layer microbend element is adopted, the effective length of the signal fiber is extended, and the bending curvature of the signal fiber is reduced, thereby improving the accuracy of the device and greatly prolonging the service life of the signal fiber simultaneously, so that the device of the invention has wide application prospects.
Description
Technical field
The invention belongs to the sensing device of gas or liquid pressure measurement instrument, especially relate to a kind of based on C type bourdon tube and reach the device of pressure sensing purpose by the detection that fiber microbending loss is changed.
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.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 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 invention provides a kind of fiber pressure sensing device based on C type bourdon tube, 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 used in the present invention is: a kind of fiber pressure sensing device based on C type bourdon tube is characterized in that: have a little curved element of multilayer that comprises signal optical fibre to be installed on the C type bourdon tube.
When being fed by measuring pressure in the C type bourdon tube, C type bourdon tube has the circle of change and stretches trend, the displacement of stretching of C type bourdon tube causes the little curved compression element of multilayer, 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 testing tool, 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 invention solves further technical matters is: have a little curved element of multilayer fibers that comprises reference optical fiber to be installed on the fixed support.
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 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 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 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, as 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: 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: 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 present invention compared with prior art has the following advantages:
1, based on the fiber pressure sensing device of C type bourdon tube, this sensor construction is simple, reasonable in design, method of operating convenient and use-pattern is flexible, highly sensitive;
2, based on the fiber pressure sensing device of C type bourdon tube, 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 fiber pressure sensing device of C type bourdon tube 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.
Below by drawings and Examples, the technical scheme of inventing is described in further detail.
Description of drawings
Fig. 1 is the 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 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; | The 2-anchor clamps; | The 3-fixed support; |
| The little curved element of 4-multilayer; | The 5-test cell; | The 6-signal optical fibre; |
| The 7-processing unit; | The 8-anchor clamps; | 9-C type bourdon tube; |
| The 20-1X2 optical branching device; | The 21-stabilized light source; | The 22-photo-detector; |
| The 23-light reflection mirror; | The 30-spring wire. |
Embodiment
As shown in Figure 1 and Figure 2, the present invention has two ends that comprise the little curved element 4 of multilayer of signal optical fibre 6 to be installed on respectively on C type bourdon tube 9 and the fixed support 3 by anchor clamps 2 and anchor clamps 8.The extended fiber 1 that passes through of signal optical fibre 6 is connected with test cell 5, what test cell 5 connected later is processing unit 7, the variation of signal optical fibre 6 bending curvatures can cause the variation at the light signal of signal optical fibre 6 internal transmission, can monitor the variation of this light signal by test cell 5, and carry out subsequent treatment by processing unit 7.In tested pressure P feeds C type bourdon tube 9, C type bourdon tube 9 has the circle of change and stretches trend, the displacement of stretching of C type bourdon tube 9 drives anchor clamps 2, make the position change between anchor clamps 2 and the anchor clamps 8, thereby cause the compression of the little curved element 4 of multilayer, the bending curvature that is included in the signal optical fibre 6 in the little curved element 4 of multilayer is changed, thereby make the optical signal power that is transmitted in the signal optical fibre 6 that significant variation be arranged, by the detection of test cell 5, reached the size of measuring pressure P.Owing to adopted the little curved element 4 of multilayer, prolonged the effective length of signal optical fibre 6, and reduced the bending curvature of signal optical fibre 6, thereby in the precision that improves this device simultaneously, prolonged the serviceable life of signal optical fibre 6 greatly.The little curved element 4 of multilayer in the present embodiment is to be made of double-layer plate type bent forming device, also can be increased to the more numbers of plies such as three layers, four layers certainly as required, thereby can make device of the present invention have very high precision and sensitivity.
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.
In addition, in the present embodiment, can there be a little curved element 4 of multilayer fibers that comprises reference optical fiber to be installed on the fixed support 3 with one, with of the influence of disturbing factors such as compensation temperature, vibrations to test result.Reference optical fiber and signal optical fibre 6 are the optical fiber of same type, and reference optical fiber is under the identical protective condition with signal optical fibre 6.
As shown in Figure 3, in the present embodiment, as different from Example 1: be mounted with light reflection mirror 23 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 20,2 ends of 1X2 optical branching device 20 connect stabilized light source 21 and photo-detector 22 respectively, stabilized light source 21 is connected with processing unit 7 again with photo-detector 22, 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 4, in the present embodiment, as different from Example 1: the little curved element 4 of multilayer is that the little curved element that the inside by a screw type includes two row distortion teeth of interlaced correspondence constitutes, 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.
As shown in Figure 5, in the present embodiment, as different from Example 1: the little curved element 4 of multilayer is to have the little curved element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire 30 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.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (10)
1. based on the fiber pressure sensing device of C type bourdon tube, it is characterized in that: have a little curved element of multilayer that comprises signal optical fibre to be installed on the C type bourdon tube.
2. according to the described fiber 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 on the fixed support based on C type bourdon tube.
3. according to claim 1 or 2 described fiber pressure sensing devices based on C type bourdon tube, 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 claim 1 or 2 described fiber pressure sensing devices based on C type bourdon tube, it is characterized in that: 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.
5. according to claim 1 or 2 described fiber pressure sensing devices based on C type bourdon tube, 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 fiber pressure sensing device based on C type bourdon tube of claim 1, it is characterized in that: an end of described signal optical fibre is mounted with light reflecting device.
7. according to the described fiber pressure sensing device based on C type bourdon tube of claim 6, 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 fiber pressure sensing device based on C type bourdon tube of claim 1, it is characterized in that: described signal optical fibre is coated by waterproof material.
9. according to the described fiber pressure sensing device based on C type bourdon tube of claim 8, it is characterized in that: described waterproof material is a greasy for preventing water.
10. according to the described fiber pressure sensing device based on C type bourdon tube of claim 1, it is characterized in that: described signal optical fibre is plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber, and is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
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| CN2010102256264A CN101922989A (en) | 2010-07-13 | 2010-07-13 | Fiber pressure sensing device based on C-shaped spring tube |
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| CN2010102256264A CN101922989A (en) | 2010-07-13 | 2010-07-13 | Fiber pressure sensing device based on C-shaped spring tube |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011124126A1 (en) * | 2010-04-06 | 2011-10-13 | 西安金和光学科技有限公司 | Fiber optic sensor based on spiral structure |
| CN102937468A (en) * | 2012-11-16 | 2013-02-20 | 中国科学院半导体研究所 | Optical fiber flow meter based on bourdon tube |
| CN104612665A (en) * | 2014-12-31 | 2015-05-13 | 哈尔滨工业大学 | Three-membrane and two-amplification high-voltage optical fiber pressure sensor and measuring method for underground pipeline pressure by sensor |
| CN109141491A (en) * | 2018-09-29 | 2019-01-04 | 成都凯天电子股份有限公司 | Pressure-type optical fiber is slightly variable sensor |
| CN109186825A (en) * | 2018-08-10 | 2019-01-11 | 哈尔滨工业大学（深圳） | A kind of optical fiber macrobend pressure sensor and its measuring system |
| CN110174047A (en) * | 2018-10-25 | 2019-08-27 | 山东理工大学 | A kind of back pressure type U-tube gas electric transducer |
| 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
- 2010-07-13 CN CN2010102256264A patent/CN101922989A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011124126A1 (en) * | 2010-04-06 | 2011-10-13 | 西安金和光学科技有限公司 | Fiber optic sensor based on spiral structure |
| US8616069B2 (en) | 2010-04-06 | 2013-12-31 | Xian Genher Optical Tech. Company | Fiber optic sensor based on spiral structure |
| CN102937468A (en) * | 2012-11-16 | 2013-02-20 | 中国科学院半导体研究所 | Optical fiber flow meter based on bourdon tube |
| CN104612665A (en) * | 2014-12-31 | 2015-05-13 | 哈尔滨工业大学 | Three-membrane and two-amplification high-voltage optical fiber pressure sensor and measuring method for underground pipeline pressure by sensor |
| CN104612665B (en) * | 2014-12-31 | 2017-07-28 | 哈尔滨工业大学 | Three films two are put high voltage optical fiber pressure sensor and the measuring method of down-hole pipe pressure are realized using the sensor |
| CN109186825A (en) * | 2018-08-10 | 2019-01-11 | 哈尔滨工业大学（深圳） | A kind of optical fiber macrobend pressure sensor and its measuring system |
| CN109141491A (en) * | 2018-09-29 | 2019-01-04 | 成都凯天电子股份有限公司 | Pressure-type optical fiber is slightly variable sensor |
| CN110174047A (en) * | 2018-10-25 | 2019-08-27 | 山东理工大学 | A kind of back pressure type U-tube gas electric transducer |
| 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: 20101222 |