CN102478410A - Bamboo joint type quasi-distribution optical fiber sensor - Google Patents
Bamboo joint type quasi-distribution optical fiber sensor Download PDFInfo
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- CN102478410A CN102478410A CN2010105579968A CN201010557996A CN102478410A CN 102478410 A CN102478410 A CN 102478410A CN 2010105579968 A CN2010105579968 A CN 2010105579968A CN 201010557996 A CN201010557996 A CN 201010557996A CN 102478410 A CN102478410 A CN 102478410A
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Abstract
The invention discloses a bamboo joint type quasi-distribution optical fiber sensor, which comprises signal optical fibers and a tube. The tube is formed by fixedly and alternately connecting hard shell segments and flexible segments. The signal optical fibers are positioned inside the tube, each flexible segment is composed of an outer sheath and a fiber protective tube disposed inside the outer sheath, the signal optical fibers are positioned inside the fiber protective tube, each hard shell segment comprises a shell, first deformed teeth and second deformed teeth are arranged on two inner opposite sides of each shell respectively, the first deformed teeth and the second deformed teeth are alternately and correspondingly arranged, at least one signal optical fiber is clamped between the first deformed teeth and the corresponding second deformed teeth, a testing unit is connected to at least one of two ends of each signal optical fiber, and the testing units are further connected with a processing unit for processing test data of the testing unit. The bamboo joint type quasi-distribution optical fiber sensor is simple in structure, reasonable in design, convenient in processing and manufacture, flexible in use, high in flexibility, effective in use, low in cost and wide in application prospect.
Description
Technical field
The present invention relates to a kind of fibre-optical sensing device, especially relate to a kind of slub type quasi-distributed optical fiber sensing device based on the fiber microbending loss sensing technology.
Background technology
In optical fiber sensing technology; Little curved optical fiber sensing technology and structure are important research directions; Little curved Fibre Optical Sensor belongs to one of light intensity modulation sensor, also is the minimum sensing device of cost with respect to sensors such as optical wavelength modulation, light phase modulation.The structure of most typical little curved sensing device is that clamping has signal optical fibre between the distortion tooth of two gullet plates parallel to each other; The variation of external physical quantity makes up and down the distance between the distortion tooth on two gullet plates change; The bending curvature of signal optical fibre is changed; Thereby influence the variation of transmitting optical signal power in the signal optical fibre, can obtain the information of this variation, thereby know the variation of physical quantity through the light source-photo-detector that is connected with signal optical fibre.But so little curved sensing device also is not suitable for long distance use; Even use the Flexible saw tooth plate also to have problems; Mainly be when gullet plate is crooked; The distance that is laid in up and down between the distortion tooth on two gullet plates will change, thereby has influence on the bending curvature of signal optical fibre, and this can't cause to change to the bending curvature of signal optical fibre and distinguishes with measured physical quantity.The two kinds long microbend fiber sensing arrangements that distance is used in one Chinese patent application numbers 200410073021.2, have been introduced; A kind of is wound form microbend fiber sensor; It adopts multimode optical fiber to be wrapped on the steel cable rope, and the two ends in Fibre Optical Sensor zone stick on the steel wire cable with special gelatin respectively, when steel wire cable receives the axial stress effect and when being stretched; Optical fiber also is tightened up; Optical fiber forms microbend in the cheuch of steel wire cable, the polymer protection layer of 120 micron thick because optical fiber surface is only had an appointment, and such protection has no idea under actual engineering-environment, to use; And wire rope reverses the acting force that waits other in addition, makes test result have very big uncertainty.Second kind of structure is the little curved formula Fibre Optical Sensor of sleeve pipe; Its total is divided into three parts, the optical fiber in oversheath and the oversheath, and be spirally wound on the dacron silk on the optical fiber; When oversheath is squeezed; Make optical fiber form the little curved of preiodic type, this structure still is not enough to support its use under abominable actual environment condition to the protection of optical fiber, so also do not see and promote the use of.
Contradiction between the sensing sensitivity that the present main problem of little curved fibre-optical sensing device is an optical fiber and the protection of optical fiber, highly sensitive, the protection of optical fiber is not enough, has a strong impact on the serviceable life of optical fiber and sensing device; To fiber optic protection when suitable; The sensitivity of optical fiber and sensing device has bigger forfeiture; Therefore be badly in need of a kind of new fibre-optical sensing device; Promptly this apparatus structure can effectively be protected optical fiber, resists the various injuries under the actual engineering-environment, can keep the high precision and the high sensitivity of microbend fiber sensing device again.
Summary of the invention
Technical matters to be solved by this invention is to above-mentioned deficiency of the prior art; A kind of slub type quasi-distributed optical fiber sensing device is provided, and it is simple in structure, reasonable in design and processing and fabricating convenient, uses simultaneously flexibly; Highly sensitive; Result of use is good, and cost is low, has broad application prospects.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of slub type quasi-distributed optical fiber sensing device; Comprise signal optical fibre, it is characterized in that: also comprise the body that alternately is formed by fixedly connecting duricrust sections and flexible segment, it is inner that said signal optical fibre is positioned at said body; Said flexible segment is made up of the oversheath optical fiber protective tube inner with being arranged on oversheath; Said signal optical fibre is positioned at optical fiber protective tube inside, and said duricrust sections comprises shell, is respectively arranged with distortion tooth one and distortion tooth two on inboard two the relative faces of said shell; Said distortion tooth one with the distortion tooth two between the corresponding laying of interleaved; At least signal optical fibre of clamping between said distortion tooth one and the distortion tooth two has at least an end to connect test cell in the said signal optical fibre two ends, said test cell also connects the processing unit that is used to handle the test cell test data.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: said optical fiber protective tube inside is filled with greasy for preventing water.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device is characterized in that: be provided with armor between said oversheath and the optical fiber protective tube.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: said oversheath is macromolecule corrugated tube or metallic bellows.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: the shape of cross section of said duricrust sections and flexible segment is circle.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: the shape of cross section of said duricrust sections is square, said distortion tooth one and all rectangular shape of distortion tooth two.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device is characterized in that: the connected mode between said duricrust sections and the flexible segment is bonding for welding, adhesive, the tongue and groove snapping, jump ring is connected or be threaded.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: said duricrust sections or flexible segment are provided with light reflecting device, and said signal optical fibre is provided with light reflecting device.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device, it is characterized in that: said duricrust sections or flexible segment are provided with branched structure.
Above-mentioned a kind of slub type quasi-distributed optical fiber sensing device is characterized in that: said signal optical fibre joins through extending optical fiber and test cell.
The present invention compared with prior art has the following advantages:
1, simple in structure, reasonable in design, processing and fabricating is easy, use is flexible and highly sensitive; This sensing device reaches the purpose that makes whole sensing arrangement crooked through flexible segment; Carry out the detection of physical quantity through the duricrust sections, therefore can not influence test result because of the bending of whole sensing arrangement.
2, through being distributed to make, a plurality of duricrust sections are used to survey different physical quantitys, to reach the purpose of monitoring a plurality of parameters simultaneously.
3, the flexible segment of this sensing device reserves certain surplus length; Make whole sensing arrangement bending can not cause drawing stress to optical fiber; This Yu Changye can be used as the not enough compensation of length when signal optical fibre is crooked in the duricrust sections simultaneously; Prevent that duricrust sections signal optical fibre from receiving bigger drawing stress when bending, prolonged the serviceable life of signal optical fibre.
4, this sensing device can be tested a plurality of parameters such as humidity, temperature, methane, oxygen simultaneously; And can select suitable functional material to make the distortion tooth as required; Or being out of shape one or more layers functional material of plating on the tooth, so that carry out the more monitoring of multiparameter.
5,, realized the monitoring and the accurate multi-parameter monitoring that distributes of accurate distribution through adopting optical time domain reflectometer.
6, one or more light reflecting devices can be set in important zone, calculate test result, can further increase the dynamic range and the detection range of test through the reflected light peak light power of monitoring light reflecting device.
In sum, the present invention has, and simple in structure, reasonable in design and processing and fabricating is convenient, uses flexibly, and highly sensitive, result of use is good, and cost is low, can realize the remote and accurate monitoring that distributes, and has broad application prospects.
Through accompanying drawing and embodiment, the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the vertical section structure synoptic diagram of duricrust sections among Fig. 1.
Fig. 3 is the cross section structure synoptic diagram of duricrust sections among Fig. 1.
Fig. 4 is the cross section structure synoptic diagram of flexible segment among Fig. 1.
Fig. 5 is the cross section structure synoptic diagram of duricrust sections in the embodiment of the invention 2.
Fig. 6 is the cross section structure synoptic diagram of duricrust sections in the embodiment of the invention 3.
Fig. 7 is the cross section structure synoptic diagram of flexible segment in the embodiment of the invention 3.
Fig. 8 is the structural representation of the embodiment of the invention 4.
Description of reference numerals:
1-extends optical fiber; The 2-shell; 3-is out of shape tooth one;
4-is out of shape tooth two; The 5-test cell; The 6-signal optical fibre;
The 7-processing unit; The 8-oversheath; The 9-armor;
10-duricrust sections; The 11-light reflecting device; The 12-flexible segment;
The 13-branched structure; The 14-greasy for preventing water; The 15-optical fiber protective tube.
Embodiment
Like Fig. 1,2, a kind of slub type quasi-distributed optical fiber sensing device shown in 3 and 4; Comprise signal optical fibre 6; Also comprise the body that alternately is formed by fixedly connecting duricrust sections 10 and flexible segment 12; It is inner that said signal optical fibre 6 is positioned at said body, and said flexible segment 12 is made up of oversheath 8 and the optical fiber protective tubes 15 that are arranged on oversheath 8 inside, and said signal optical fibre 6 is positioned at optical fiber protective tube 15 inside; Said duricrust sections 10 comprises shell 2; Be respectively arranged with distortion tooth 1 and distortion tooth 24 on said shell 2 inboard two relative faces, the corresponding laying of interleaved between said distortion tooth 1 and the distortion tooth 24, said distortion tooth 1 and be out of shape between the tooth 24 signal optical fibre 6 of clamping at least; Have at least an end to connect test cell 5 in said signal optical fibre 6 two ends, said test cell 5 also connects the processing unit 7 that is used to handle test cell 5 test datas.
In the present embodiment, said oversheath 8 is macromolecule corrugated tube or metallic bellows, and said signal optical fibre 6 joins with test cell 5 through extending optical fiber 1, and the shape of cross section of said duricrust sections 10 and flexible segment 12 is circle.Said duricrust sections is laid with bleeder vent on 10 surfaces, and said distortion tooth 1 and distortion tooth 24 are processed by functional material, or distortion tooth 1 goes up plating with distortion tooth 24 surfaces functional material is arranged, and said distortion tooth 1 is all a plurality of with the quantity of distortion tooth 24.Said optical fiber protective tube 15 inside are filled with greasy for preventing water 14; Be provided with armor 9 between said oversheath 8 and the optical fiber protective tube 15; Be fixed together through welding manner between duricrust sections 10 and the flexible segment 12, also can select modes such as adhesive is bonding, tongue and groove snapping, jump ring connects or be threaded to connect according to actual conditions.Said signal optical fibre 6 is for the outside optical fiber that is surrounded by multi-protective layer, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.The shell 2 of said duricrust sections 10 is processed by low-expansion material, and distortion tooth 1 all adopts high-expansion material to process with distortion tooth 24, can constitute temperature sensing unit like this; When temperature variation; The height change of distortion tooth 1 and distortion tooth 24; Make the bending curvature that is clamped in the signal optical fibre 6 between distortion tooth 1 and the distortion tooth 24 change; The variation of signal optical fibre 6 bending curvatures changes the signal optical fibre 6 inner optical signal powers that produce, and test cell 5 records this change information and passes to processing unit 7, and processing unit 7 is through calculating the variation of temperature value.
Principle of work of the present invention is: be applied to a joint or 10 last times of more piece duricrust sections as acting force; 10 distortion of duricrust sections make that being positioned at its inner distortion tooth 1 changes with the height that is out of shape tooth 24; Distortion tooth 1 makes the bending curvature that is clamped in signal optical fibre 6 between the two change with the height change of distortion tooth 24; The variation of signal optical fibre 6 bending curvatures changes the inner optical signal powers that produce of signal optical fibre 6, and test cell 5 records this change information and passes to processing unit 7, by the size of processing unit 7 through the acting force that calculates duricrust sections 10 and receive; When free correlation parameter; Can confirm to receive the position of the duricrust sections 10 that acting force influences, adopt optical time domain reflectometers, just can confirm the position of acting force like test cell 5.
This sensing device also can be used for the test to liquid or gas parameter, and at this moment the surface of duricrust sections 10 must have for liquid or the hole of gas flow.As when adopting the density of hydrogen in this device detecting air; Then be out of shape tooth 1 and process by the Metal Palladium or the palldium alloy material that can absorb hydrogen and corresponding generation dilatation, also can all apply one or more layers by Metal Palladium that can absorb hydrogen and corresponding generation dilatation or the dilatation layer that the palldium alloy material is processed in the outside of distortion tooth 1 and distortion tooth 24 with distortion tooth 24.In the actual use; Hydrogen enters into its inside through the bleeder vent that distributes on the duricrust sections 10; When density of hydrogen changed, Metal Palladium or palldium alloy absorbed hydrogen and along with the changeable volume of density of hydrogen becomes big or diminishes made distance between distortion tooth 1 and the distortion tooth 24 widen or dwindle; Thereby just can change the bending radius that is clipped in signal optical fibre 6; Promptly changed the bending loss coefficient of signal optical fibre 6, and then changed the decay size of the light signal of transmission in the signal optical fibre 6, detected the variation of this optical signal power and this variation is passed to processing unit 7 through test cell 5; Carry out analyzing and processing by processing unit 7, can obtain the change in concentration amount of hydrogen in the air.
In like manner; Signal optical fibre 6 outside plating one or more layers during by Metal Palladium that can absorb hydrogen and corresponding generation dilatation or dilatation layer that the palldium alloy material is processed; When density of hydrogen changes, causing the volume change of this dilatation layer; Also can obtain making distortion tooth 1 and be out of shape the equal effect that the distance between the tooth 24 changes, thereby reach the purpose of monitoring physical quantity.
Promote the purpose that detects a plurality of physical quantitys in order to reach; The duricrust sections is to be made up of a plurality of duricrust sections of surveying different physical quantities respectively; As need parameters such as probe temperature, humidity, stress; Can a plurality of duricrust sections 10 be made as the duricrust sections 10 to temperature, humidity, stress test respectively, reach the purpose of monitoring multiparameter simultaneously.
As shown in Figure 5, in the present embodiment, different with embodiment 1 is: the shape of cross section of duricrust sections 10 is square, and distortion tooth 1 and distortion tooth 24 be rectangular shape all, signal optical fibre 6 distortion tooth 1 be out of shape between the tooth 24.Because distortion tooth 1 is a rectangular shaped with distortion tooth 24, can monitor the acting force that acts on two orthogonal methods on the duricrust sections 10.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Like Fig. 6 and shown in Figure 7, in the present embodiment, different with embodiment 1 is: include 6, two signal optical fibres 6 of two signal optical fibres in flexible segment 12 and the duricrust sections 10 and connect 5, two test cells 5 of two test cells respectively and all join with processing unit 7; Or two signal optical fibres 6 connect photoswitch earlier, and photoswitch connects test cell 5, and test cell 5 connects processing unit 7.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 8; In the present embodiment, different with embodiment 1 is: flexible segment is provided with light reflecting device 11, and duricrust sections 10 is provided with the branched structure 13 of Y type; Signal optical fibre 6 ends also are mounted with light reflecting device 11; Can make light signal pass through sensitive zones twice like this, sensing accuracy doubles, and branched structure 13 can make sensitive zones expand to bigger scope.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. slub type quasi-distributed optical fiber sensing device; Comprise signal optical fibre (6); It is characterized in that: also comprise the body that alternately is formed by fixedly connecting duricrust sections (10) and flexible segment (12); It is inner that said signal optical fibre (6) is positioned at said body, and said flexible segment (12) is made up of oversheath (8) and the optical fiber protective tube (15) that is arranged on oversheath (8) inside, and said signal optical fibre (6) is positioned at optical fiber protective tube (15) inside; Said duricrust sections (10) comprises shell (2); Be respectively arranged with distortion tooth one (3) and distortion tooth two (4) on inboard two the relative faces of said shell (2), said distortion tooth one (3) be out of shape the corresponding laying of interleaved between the tooth two (4), said distortion tooth one (3) and be out of shape between the tooth two (4) signal optical fibre of clamping (6) at least; Have at least an end to connect test cell (5) in said signal optical fibre (6) two ends, said test cell (5) also connects the processing unit (7) that is used to handle test cell (5) test data.
2. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: said optical fiber protective tube (15) inside is filled with greasy for preventing water (14).
3. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: be provided with armor (9) between said oversheath (8) and the optical fiber protective tube (15).
4. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 3, it is characterized in that: said oversheath (8) is macromolecule corrugated tube or metallic bellows.
5. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: the shape of cross section of said duricrust sections (10) and flexible segment (12) is circle.
6. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: the shape of cross section of said duricrust sections (10) is square, all rectangular shape of said distortion tooth one (3) and distortion tooth two (4).
7. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: the connected mode between said duricrust sections (10) and the flexible segment (12) is bonding for welding, adhesive, the tongue and groove snapping, jump ring is connected or be threaded.
8. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: said duricrust sections (10) or flexible segment (12) are provided with light reflecting device (11), and said signal optical fibre (6) is provided with light reflecting device (11).
9. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: said duricrust sections (10) or flexible segment (12) are provided with branched structure (13).
10. according to the described a kind of slub type quasi-distributed optical fiber sensing device of claim 1, it is characterized in that: said signal optical fibre (6) joins with test cell (5) through extending optical fiber (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105579968A CN102478410A (en) | 2010-11-24 | 2010-11-24 | Bamboo joint type quasi-distribution optical fiber sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105579968A CN102478410A (en) | 2010-11-24 | 2010-11-24 | Bamboo joint type quasi-distribution optical fiber sensor |
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| CN2010105579968A Pending CN102478410A (en) | 2010-11-24 | 2010-11-24 | Bamboo joint type quasi-distribution optical fiber sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869433A (en) * | 2013-02-22 | 2014-06-18 | 浙江吉利汽车有限公司 | Fiber optic sheath |
| EP2958187A1 (en) * | 2014-05-28 | 2015-12-23 | Spinner GmbH | Flexible, bendable and twistable terahertz waveguide |
| CN111736274A (en) * | 2020-07-22 | 2020-10-02 | 陈佳佳 | Anti-bending optical fiber jumper convenient for wire arrangement and use method thereof |
-
2010
- 2010-11-24 CN CN2010105579968A patent/CN102478410A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869433A (en) * | 2013-02-22 | 2014-06-18 | 浙江吉利汽车有限公司 | Fiber optic sheath |
| CN103869433B (en) * | 2013-02-22 | 2017-10-31 | 浙江吉利汽车有限公司 | Optical fiber jacket |
| EP2958187A1 (en) * | 2014-05-28 | 2015-12-23 | Spinner GmbH | Flexible, bendable and twistable terahertz waveguide |
| CN106463810A (en) * | 2014-05-28 | 2017-02-22 | 斯宾纳有限公司 | Flexible, bendable and twistable terahertz waveguide |
| CN106463810B (en) * | 2014-05-28 | 2018-05-08 | 斯宾纳有限公司 | Flexible, flexible and coilable terahertz waveguide |
| US10079418B2 (en) | 2014-05-28 | 2018-09-18 | Spinner Gmbh | Flexible terahertz waveguide comprising a dielectric waveguide core which is supported within a segmented tube by dielectric threads |
| CN111736274A (en) * | 2020-07-22 | 2020-10-02 | 陈佳佳 | Anti-bending optical fiber jumper convenient for wire arrangement and use method thereof |
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Application publication date: 20120530 |