CN202338781U - Installation structure of OFS (optical fiber sensor) in gas pipeline leakage optical fiber monitoring system - Google Patents
Installation structure of OFS (optical fiber sensor) in gas pipeline leakage optical fiber monitoring system Download PDFInfo
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- CN202338781U CN202338781U CN2011203448242U CN201120344824U CN202338781U CN 202338781 U CN202338781 U CN 202338781U CN 2011203448242 U CN2011203448242 U CN 2011203448242U CN 201120344824 U CN201120344824 U CN 201120344824U CN 202338781 U CN202338781 U CN 202338781U
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Abstract
The utility model relates to an installation structure of an OFS (optical fiber sensor) in a gas pipeline leakage optical fiber monitoring system. The OFS for detecting radial vibration of a pipeline is formed by an elastic cylindrical body (3), an optical fiber interferometer (4) and a tail optical fiber winding case (1); an interferometric arm of the optical fiber interferometer is wound uniformly and sequentially on the periphery of the elastic cylindrical body (3), and the optical fiber is bonded to the elastic cylindrical body (3) tightly, the rest optical fiber interferometer and relevant parts thereof after winding are orderly wound in the tail optical fiber winding case (1); the tail optical fiber winding case (1) is fixed at the top of the elastic cylindrical body through binder; and further, an inward-concave end of the elastic cylindrical body (3) is bonded onto the outer surface of the gas pipeline through the binder, the corresponding anti-corrosive treatment is performed for the pipeline, and the entire sensor is in seamless butt connection with the corrosive layer on the surface of the pipeline. The installation structure can efficiently control the sensitivity of a probe of the optical fiber unit, and has an excellent isolation and shied effect for signal interference except for gas leakage.
Description
Technical field
The utility model is the installation structure of optical fiber sensor of a kind of gas pipeline leakage fiber-optic monitoring system, relates to the measurement and the pipe-line system technical field of optical fiber sensing technology, mechanical vibration.
Background technique
At present, the pipeline length overall of building up in the world reaches 2,500,000 kilometers, and having surpassed the railway total kilometrage becomes the main means of transportation of world energy sources, and the oil product of developed country and oil-producing area, the Middle East transports all realizes channelization.China's pipeline has also obtained very fast development in recent years; Length overall is also above 70,000 kilometers; Begun to take shape across thing, stretch from the north to the south, cover the whole nation, be communicated with the overseas big general layout of energy pipe network, pipeline transport becomes the main mode of the allotment conveying of the strategic energy such as oil gas.
Pipeline is because cross-regional wide, receives natural disaster, the third party reasons such as destructions of constructing, and caused more pipe leakage accident generation.In case natural gas line leaks, will cause and stop defeated and a large amount of natural gas resources losses completely.This not only directly has influence on city along the line and with the energy resource supply of gas enterprise, and, also very easily cause security incidents such as fire, blast, threaten the people life property safety in area along the line, even also can cause serious environmental to pollute and ecocatastrophe.For example, the natural gas line big bang takes place in U.S. San Bruno city on September 9th, 2010, and blast causes long 51 meters, wide 9 a meters hollow place on the road surface.The pipeline of about 8 meters of one segment length, 76 centimetres of diameters is flown out about 30 meters far away, and causes large-range fire disaster by fried Heaven, causes 4 people dead, and 3 people are missing, and at least 52 people are injured, 4 hectares of burnt areas, and tens of houses are burnt.People's safety, environmental consciousness significantly promote in recent years, also obtain increasing attention as the pipeline transportation safety problem of high risk industries.
Make a general survey of domestic and external various line leakage technology; The negative pressure wave method that generally uses at present, flow equilibrium method, oil transport pipeline leak detection technologies such as pressure gradient; Can't effectively solve the Leak testtion problem of gas pipeline, especially to the identification and the location of minute leakage.And based on the good sensing characteristics of optical fiber; Optical fiber sensing technology is able to fast development; Wherein using more is to utilize an optical cable with the pipeline laying in one ditch as the gas leakage sensing unit; Though sensitivity is higher than conventional art, its locating effect is poor, can not satisfy the application demand of natural gas line leakage fully.Another kind of quasi-distributed optical fiber sensory technique based on the optical fiber multiplexing technology, the identification and the location that can effectively solve the pipeline gas minute leakage.But the installation specification of its Fibre Optical Sensor unit is complicated, and design difficulty is big, mainly is to guarantee that Fibre Optical Sensor unit detection sensitivity is enough high, and noise isolation property will be got well.
The model utility content
The purpose of the utility model is that a kind of installation of design is comparatively simple and make enough installation structure of optical fiber sensor of height, gas pipeline leakage fiber-optic monitoring system that noise isolation property is enough good of Fibre Optical Sensor unit detection sensitivity.
The utility model is to leak the Fibre Optical Sensor unit installation method of vibration monitoring method and system to having highly sensitive quasi-distributed optical fiber sensing.It is to have installation high sensitivity optical fiber interference type leak optical fiber sensor on the pipeline body of certain intervals; The vibration wave signal that continuous real-time monitoring is propagated along pipeline body; Vibration wave signal to gathering carries out analysing and processing; Comprise type identification and vibration source location; Wherein type identification is through whether it belongs to leak type to vibration wave Feature Extraction analysis and distinguishing; The velocity of propagation of time lag combining vibration ripple on pipeline body that simultaneously propagates into adjacent several optical fiber transducers according to vibration wave realize the confirming of vibration wave source position, realizing above-mentioned provides the position information of leakage point to after the vibration wave signal analysis and processing incident of leakage being reported to the police simultaneously.And adopting the high sensitivity optical fiber sensor suitably to increase the quantity of optical fiber transducer on improving the basis of incident of leakage monitoring sensitivity; Expanded and to have picked up the frequency range of monitor signal, and the time delay that combines a plurality of optical fiber transducers to carry out estimates that localization method has guaranteed the accuracy of system location.
In gas pipeline leakage fiber-optic monitoring system, sensing unit is the key that realizes line leakage, and when pipeline takes place to leak, leaking the vibration wave that excites will propagate to the leakage point both sides along pipeline.A sensing unit is installed on pipeline body at a certain distance, is used for monitoring the leakage vibration wave on the pipeline.Sensing unit adopts the fibre optic interferometer structure, can use optical fiber Michelson interferometer or optical fiber mach Zehnder interferometer to detect sensing unit as leaking vibration wave.
The optical fiber transducer of the utility model is the optical fiber transducer that detects the pipeline radial vibration.Detect the structure of the optical fiber transducer of pipeline radial vibration and see Fig. 1, sensor is by being made up of elastic cylinder 3, fibre optic interferometer 4 and tail optical fiber fiber management tray 1; Wherein, The interference arm of uniform sequential winding fibre optic interferometer on the elastic cylinder periphery; And optical fiber and cylindrical body tightly are bonded together with tackiness agent; Twine remaining fibre optic interferometer in back and related device thereof with neat being coiled in the tail optical fiber fiber management tray 1, input, output optical fibre 2 expose outside; Tail optical fiber fiber management tray 1 passes through adhesive at elastic cylinder 3 tops.When sensor is installed, use tackiness agent to be bonded on the natural gas line outer surface concave end of elastic cylinder 3, and do corresponding pipeline corrosion protection and handle, make the whole and pipe surface anticorrosive coat slitless connection of sensor.
Described elastic cylinder 3 is a bottom indent and the radian steel short cylindrical body consistent with pipeline external surface; The radial vibration that produces during gas pipeline leakage lets elastic cylinder 3 that deformation takes place, and deformation also takes place the fibre optic interferometer 4 that drives the winding of elastic cylinder periphery, changes the state of the light of transmission in the optical fiber thus, so that is detected by rear end equipment;
The sensor body bottom is adhesively fixed in the natural gas line outer surface through adhesive, and sensor fibre can not viscose glue, the directly outer steel of contact pipeline surface.
Wherein have the vibration damping layer in the shell of sensor, mainly play isolating pipelines wall external interference signal and fixing protection sensor.
The utility model is to the above-mentioned installation method that has proposed a kind of Fibre Optical Sensor unit based on the quasi-distributed line leakage system of optical fiber multiplexing sensory technique.This method can guarantee that the detection sensitivity of optical fiber transducer is high, and the effective undesired signal beyond the isolating pipelines wall is applicable to the optical fiber transducer installation of direct contact pipe surface again.Can be quasi-distributed natural gas line leakage based on the optical fiber transducer of this installation method high position precision and highly sensitive monitoring means are provided.
The technological scheme that the utility model adopted is: this invention comprises optical fiber transducer body 6, sensor shield 7 and natural gas line.This sensor body 6 is box bodys that a bottom is uniform-distribution with sensor fibre, and the bottom indent is the radian that is complementary with pipeline external surface, and this mainly is in order to make sensor fibre possibility contact tube pipeline outer wall unexpectedly, to increase its sensitivity.The inner spongy layer with the vibration damping protective action of sensor shield mainly plays isolating pipelines wall external interference signal and protection sensor.Before sensor installation, need remove the anticorrosive coat of the natural gas line outer surface of respective regions clean; Expose steel tube surface, during installation, use adhesive that sensor body 6 is bonded on the pipeline outer wall; This also is in order to make sensor fibre possibility contact tube pipeline outer wall unexpectedly, to increase its sensitivity.Afterwards sensor shield 7 is covered on sensor body 6 outsides; Draw from the cable groove that goes out of sensor shield 7 by the transmission cable of drawing in the sensor body 6; At last the seam crossing at sensor shield 7 and pipeline carries out gluing and preservative treatment, makes itself and pipe surface anticorrosive coat slitless connection.
The effect and the benefit of the utility model are; Natural gas line leakage optical fiber transducer based on this mounting structure has the detection sensitivity height; The advantage that noise isolation property is good can be quasi-distributed natural gas line leakage high position precision and highly sensitive monitoring means is provided.
Description of drawings
Fig. 1 Fibre Optical Sensor natural gas line leakage system principle diagram
Fig. 2 pipeline radial vibration detection fiber sensor construction figure
The fiber optic sensor mounting method schematic representation of Fig. 3 natural gas line leakage
The Fibre Optical Sensor unit installing structure schematic representation (partial enlarged drawing) of Fig. 4 natural gas line leakage
Wherein: 1-tail optical fiber fiber management tray 2-input, output optical fibre 3-elastic cylinder
4-fibre optic interferometer 5-transmission cable 6-sensor body
7-sensor shield 8-rectangular spring sheet 9-pipe surface
10-pipe surface anticorrosive coat.
Embodiment
In conjunction with accompanying drawing and embodiment the utility model is further specified, but should not limit the protection domain of the utility model with this.
Embodiment. this example mainly is the embodiment who is designed to gas pipeline leakage fiber-optic monitoring system sensor, so need on this monitoring system embodiment's basis, to carry out.This monitoring system constitutes as shown in Figure 1; Every separated 1.5km installs an optical fiber transducer on pipeline body, and 10 sensors are installed altogether, and preceding 5 sensors and back 5 sensors constitute a sensor groups respectively; An optical fiber in all optical fiber transducer group common transmitted optical cables is connected with system source; As launching fiber, simultaneously each optical fiber transducer group uses optical fiber in the transmission cable to be connected with the system photodetector again alone, as returning optical fiber; Photodetector output termination comprises the signals collecting and the puocessing module of leakage signal identification and incident locating function, and said signals collecting and puocessing module comprise that signal conditioner, signal picker, processing unit, terminal show and external interface; What wherein connect the photodetector output terminal is signal conditioner, signal picker and processing unit successively, and processing unit output has the terminal to show and external interface.Signal picker and processing unit output connect microcomputer.
This routine used optical fiber transducer is optical fiber transducer such as the Fig. 2 that detects the pipeline radial vibration.
The only main sensor fibre of the sensor that system adopted in this example constitutes; Production method forms according to the method coiling of Fig. 2; Its outside is covered with sensor shield 7, and sensor shield 7 internal layers stick on pipe surface that plane leave anticorrosive coat with adhesive glue with one deck vibration isolation sponge during installation; Make the indent bottom of sensor be close to pipeline outer wall, realize picking up the pipeline body vibration;
In this example; The concrete installation method of this system's optical fiber transducer is like Fig. 3, shown in 4: at first; The natural gas line external surface coating 10 of cleaning sensing mounting zone, the removal original anticorrosive coat of pipe surface is also slightly polished, until exposing smooth steel pipe walls 9.Then, evenly smear adhesive, sensor base or rectangular spring sheet 8 are pressed on outer surface of steel tube 9, till adhesive solidifies fully at outer surface of steel tube.Then sensor shield 7 is covered sensor body 6 fully, and pad is gone up the vibration damping interlayer betwixt, sensor shield 7 sides goes out the cable groove and should aim at transmission cable 5 positions on the sensor when mounted.Carry out gluing and preservative treatment in sensor shield and pipeline joint-seam place at last, use with natural gas line cover coat identical materials therebetween and carry out, finally make the whole and pipe surface anticorrosive coat slitless connection of sensor.
This example is through test of many times; Can realize monitoring through on tube wall, install leaking the vibration sensing interferometric sensor along any disturbance behavior of pipe transmmision; Through realizing incident of leakage is reported to the police and provided the leakage point position signal analysis and processing and intelligent recognition; System sensitivity is high, through the intelligent recognition of leaking has been reduced system's false alarm rate that incident causes largely.
Claims (4)
1. the installation structure of optical fiber sensor of a gas pipeline leakage fiber-optic monitoring system is characterized in that: be made up of the optical fiber transducer that detects the pipeline radial vibration elastic cylinder (3), fibre optic interferometer (4) and tail optical fiber fiber management tray (1); Wherein, The interference arm of uniform sequential winding fibre optic interferometer on the elastic cylinder periphery; And optical fiber and cylindrical body tightly are bonded together with tackiness agent; Twine remaining fibre optic interferometer in back and related device thereof with neat being coiled in the tail optical fiber fiber management tray (1), input, output optical fibre (2) expose outside; Tail optical fiber fiber management tray (1) passes through adhesive at elastic cylinder (3) top; When sensor is installed, use tackiness agent to be bonded on the natural gas line outer surface concave end of elastic cylinder (3), and do corresponding pipeline corrosion protection and handle, make the whole and pipe surface anticorrosive coat slitless connection of sensor.
2. the installation structure of optical fiber sensor of gas pipeline leakage fiber-optic monitoring according to claim 1 system is characterized in that said elastic cylinder (3) is a bottom indent and the radian steel short cylindrical body consistent with pipeline external surface.
3. the installation structure of optical fiber sensor of gas pipeline leakage fiber-optic monitoring according to claim 1 system; It is characterized in that the natural gas line outer surface need remove anticorrosive coat before the sensor installation; Expose the steel tube surface body; The sensor body bottom is adhesively fixed in the outer surface of natural gas line steel through adhesive, and sensor fibre can not viscose glue, the directly outer steel of contact pipeline surface.
4. the installation structure of optical fiber sensor of gas pipeline leakage fiber-optic monitoring according to claim 1 system is characterized in that in the shell of said sensor with the vibration damping layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203448242U CN202338781U (en) | 2011-09-14 | 2011-09-14 | Installation structure of OFS (optical fiber sensor) in gas pipeline leakage optical fiber monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203448242U CN202338781U (en) | 2011-09-14 | 2011-09-14 | Installation structure of OFS (optical fiber sensor) in gas pipeline leakage optical fiber monitoring system |
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| CN202338781U true CN202338781U (en) | 2012-07-18 |
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| CN2011203448242U Expired - Fee Related CN202338781U (en) | 2011-09-14 | 2011-09-14 | Installation structure of OFS (optical fiber sensor) in gas pipeline leakage optical fiber monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107524922A (en) * | 2017-09-30 | 2017-12-29 | 必必优（深圳）科技有限公司 | A kind of pipe leakage infrasonic wave detection apparatus, system and method |
| CN108240558A (en) * | 2018-03-26 | 2018-07-03 | 湖北娅安科技开发有限公司 | A kind of natural gas leakage detection device and detection method with interlink warning |
-
2011
- 2011-09-14 CN CN2011203448242U patent/CN202338781U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107524922A (en) * | 2017-09-30 | 2017-12-29 | 必必优（深圳）科技有限公司 | A kind of pipe leakage infrasonic wave detection apparatus, system and method |
| CN108240558A (en) * | 2018-03-26 | 2018-07-03 | 湖北娅安科技开发有限公司 | A kind of natural gas leakage detection device and detection method with interlink warning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170317 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120718 Termination date: 20200914 |
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| CF01 | Termination of patent right due to non-payment of annual fee |