CN104456088B - Linear type Sagnac monitoring pipeline safety system based on 3 × 3 bonders - Google Patents
Linear type Sagnac monitoring pipeline safety system based on 3 × 3 bonders Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 239000013307 optical fiber Substances 0.000 claims abstract description 61
- 239000000835 fiber Substances 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 2
- 230000000644 propagated effect Effects 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 2
- 238000004364 calculation method Methods 0.000 description 9
- 230000001934 delay Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Based on the linear type Sagnac monitoring pipeline safety system of 3 × 3 bonders, belong to optical sensor technology field.In the sensor fibre along pipe laying, vibration sound source can be produced when Near Pipelines occur destructive disturbance, the optical fiber in optical cable is produced with local vibration effect, and then make distribution type fiber-optic produce trickle deformation, the optical signal propagated in optical fiber is modulated.Present invention phase monitoring system than ever, it is divided into master, under auxiliary two loops, two-way optical fiber is laid along pipeline is radially parallel, safety monitoring is carried out to same pipeline, reduce the signal attenuation phenomenon of monitoring system generation using linear structure and avoid reciprocity effect, simplify system structure, solving other methods can not be to potential destructive behavior, particularly low-frequency excitation behavior carries out distance real-time monitoring, the present situation that destroyed or disturbance place cannot be positioned immediately, make the monitoring time, scope and judge that precision is effectively lifted, improve monitoring stability and reliability.
Description
Technical field
A kind of linear type Sagnac optical fiber interferometer sensor system Ji Yu 3 × 3 bonders of present invention design, belongs to light
Learn field of sensing technologies, its effect is by adjusting to the optical signal propagated in optical fiber the acoustical signal producing because of external disturbance
System, is then processed to the optical signal modulated and is analyzed, thus having or not stolen along the line to institute's monitoring range interior conduit or having
Unmanned for waiting destructiveness disturbance behavior to be monitored, disturbance scene is positioned.This sensing system can be used for defeated
The distance safety monitoring of the tubings such as oil gas, water delivery, realizes effective early warning monitoring.
Background technology
Currently, stolen or other anthropic factor etc. whether is occurred to threaten the behavior thing that safety in production runs along the line for pipeline
Part, the determination of behavior scene, the mostly artificial traditional method such as inspection, mass balance approach, stress wave, sonic method, but this
A little method efficiency are low, and erroneous judgement and blind spot, how it is impossible to be monitored to the behavior bringing pipeline damage in time, therefore give pipe safety
Operational monitoring brings a lot of inconvenience.He Cunfu, Hang Lijun of Beijing University of Technology etc. have invented one kind and have let out for real-time pipeline
The distributed optical fiber sensor of missing inspection, easy to use and can real time on-line monitoring, but this system capacity loss larger, and
Behavior to threat tube safe operation before pipe leakage also lacks effective early warning monitoring, can monitoring signals amplitude is low, frequency
Height, limits its monitoring actual effect, spatial dimension and precision.
Content of the invention
It is an object of the invention in solution monitoring pipeline safety, vibration signal produced by external disturbance cannot accurately,
Immediately measurement and disturbing signal occur position cannot online real-time positioning shortcoming it is proposed that a kind of for real-time pipe safety
The distributed optical fiber sensor of monitoring.The linear type Sagnac interferometer monitoring being built using 3 × 3 bonders in the present invention
System, has carried out new modeling and design to light path and circuit, improves amplitude and the signal to noise ratio of monitored signal, and it is right to can achieve
The monitoring of low-frequency excitation signal, and improve positioning precision, achievable early warning monitoring.
To achieve these goals, this invention takes following technical scheme：
Including light source (1), 2 × 1 bonder I (41), polarizer I (21), optoisolator I (31), 2 × 1 bonder II
(42), 3 × 3 bonder I (51), 2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), delay
Optical fiber I (81), 2 × 1 bonder III (43) 2 × 1 bonder IV (44)；Polarizer II (22), optoisolator II (32), 2 × 1
Bonder VI (46), 3 × 3 bonder II (52), postpone optical fiber II (82), 2 × 1 bonder IX (49), sensor fibre II (62),
Postpone optical fiber III (83), faraday rotation mirror FRM II (72), 2 × 1 bonder VII (47), 2 × 1 bonder VIII (48) with
And signal pickup assembly (9)；It is characterized in that：The laser that light source (1) sends is by by 2 × 1 bonder I (41) light splitting, dividing
Jin Ru not major loop and auxiliary loop；Major loop light through polarizer I (21) and optoisolator I (31), by 2 × 1 bonder II
(42) entrance 3 × 3 bonder I (51) form two light circuit structures afterwards and form loop clockwise and loop counterclockwise respectively；Suitable
Hour hands loop optical signal path is：2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), sensing
Optical fiber I (61), 2 × 1 bonder V (45) and delay optical fiber I (81)；Loop optical signal path is counterclockwise：Through postponing optical fiber I
(81), 2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), sensor fibre I (61), 2 × 1 couplings
Clutch V (45).Optical signal interferes via returning to 3 × 3 bonder I (51) behind loop clockwise and anticlockwise, forms 3 tunnels and does
Relate to light, respectively through 2 × 1 bonder III (43), 2 × 1 through bonder II (42) and 2 × 1 bonder IV (44) by signals collecting
Device (9) receives, and then three road optical signals is demodulated and analyzes and processes.Auxiliary loop light through polarizer II (22) and light every
From device II (32), enter 3 × 3 bonder II (52) by 2 × 1 bonder VI (46) and form two light circuit structures shape respectively afterwards
Become loop clockwise and loop counterclockwise；Loop optical signal path is clockwise：2 × 1 bonder IX (49), sensor fibre II
(62), postpone optical fiber III (83), faraday rotation mirror FRM II (72), postpone optical fiber III (83), sensor fibre II (62), 2
× 1 bonder IX (49) and delay optical fiber II (82)；Loop optical signal path is counterclockwise：Through delay optical fiber II (82), 2 ×
1 bonder IX (49), sensor fibre II (62), delay optical fiber III (83), faraday rotation mirror FRMII (72), delay optical fiber
III (83), sensor fibre II (62), 2 × 1 bonder IX (49)；Optical signal via returning to 3 behind loop clockwise and anticlockwise ×
3 bonder II (52) interfere, and form 3 tunnel interference lights, respectively through 2 × 1 bonder VII (47), 2 × 1 bonder VI
(46) and 2 × 1 bonder VIII (48) is received by signal pickup assembly (9), then three road optical signals is demodulated and analyzes
Process.
Major loop sensor fibre I (61) is laid along monitored pipeline radial direction, and places faraday's rotation in monitoring terminal
Tilting mirror FRM I (71) is to form linear structure；Auxiliary loop sensor fibre II (62) is laid along monitored pipeline radial direction, and
Place faraday rotation mirror FRM II (72) in monitoring terminal to form linear structure after postponing optical fiber III (83)；Pass
Photosensitive fibre I (61) and sensor fibre II (62) need to be pasted together parallel to ensure to monitor bar to same signal source for identical
Part.Each optical fiber that postpones need to carry out length adjustment according to actual monitoring situation, reaches optimization in order to monitoring signals.
Present invention employs above technical scheme, so that the disturbing signal frequency that monitoring system can monitor is greatly reduced,
The signal to noise ratio of signal is relatively significant improvement, and then increased the monitor in real time of monitoring pipeline safety system and effective monitoring
Scope, and improve monitoring accuracy.
Brief description
Fig. 1 present system overall schematic；
Fig. 2 frequency postpones optical fiber 2 length L for 200Hzd2=0.5km location Calculation result；
Fig. 3 frequency postpones optical fiber 2 length L for 200Hzd2=1km location Calculation result；
Fig. 4 Ld2=0.5km location Calculation result average absolute deviation compares K with postponing fiber lengthsdRelation；
Fig. 5 Ld2=1km location Calculation result average absolute deviation compares K with postponing fiber lengthsdRelation.
In figure, 1, light source, 21, polarizer I, 22, polarizer II, 31, isolator I, 32, isolator II, 41,2 × 1 couplings
Device I, 42,2 × 1 bonder II, 43,2 × 1 bonder III, 44,2 × 1 bonder IV, 45,2 × 1 bonder V, 46,2 × 1 couplings
Clutch VI, 47,2 × 1 bonder VII, 48,2 × 1 bonder VIII, 49,2 × 1 bonder IX, 51,3 × 3 bonder I, 52,3
× 3 bonder II, 61, single mode sensor fibre I, 62, single mode sensor fibre II, 71, faraday rotation mirror FRM I, 72, faraday
Revolving mirror FRM II, 81, postpone optical fiber I, 82, postpone optical fiber II, 83, postpone optical fiber III, 9, signal pickup assembly.
Specific embodiment
Content in conjunction with the inventive method provides following examples：
The structure of the present embodiment as shown in figure 1, include light source (1), 2 × 1 bonder I (41), polarizer I (21), light every
From device I (31), 2 × 1 bonder II (42), 3 × 3 bonder I (51), 2 × 1 bonder V (45), sensor fibre I (61), farad
Revolving mirror FRM I (71), delay optical fiber I (81), 2 × 1 bonder III (43) 2 × 1 bonder IV (44)；Polarizer II
(22), optoisolator II (32), 2 × 1 bonder VI (46), 3 × 3 bonder II (52), postpone optical fiber II (82), 2 × 1 couplings
Device IX (49), sensor fibre II (62), delay optical fiber III (83), faraday rotation mirror FRM II (72), 2 × 1 bonder VII
(47), 2 × 1 bonder VIII (48) and signal pickup assembly (9)；It is characterized in that：The laser that light source (1) sends passes through 2
× 1 bonder I (41) light splitting, respectively enters major loop and auxiliary loop；Major loop light is through polarizer I (21) and optoisolator I
(31), form two light circuit structures afterwards by 2 × 1 bonder II (42) entrance 3 × 3 bonder I (51) and form up time respectively
Pin loop and loop counterclockwise；Loop optical signal path is clockwise：2 × 1 bonder V (45), sensor fibre I (61), farad
Revolving mirror FRM I (71), sensor fibre I (61), 2 × 1 bonder V (45) and delay optical fiber I (81)；Loop light letter counterclockwise
Number path is：Through postponing optical fiber I (81), 2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I
(71), sensor fibre I (61), 2 × 1 bonder V (45).Optical signal couples via returning to 3 × 3 behind loop clockwise and anticlockwise
Device I (51) interferes, and forms 3 tunnel interference lights, respectively through 2 × 1 bonder III (43), 2 × 1 through bonder II (42) and 2
× 1 bonder IV (44) is received by signal pickup assembly (9), then three road optical signals is demodulated and analyzes and processes.Auxiliary time
Road light, through polarizer II (22) and optoisolator II (32), enters 3 × 3 bonder II (52) by 2 × 1 bonder VI (46)
Form two light circuit structures afterwards and form loop clockwise and loop counterclockwise respectively；Loop optical signal path is clockwise：2×
1 bonder IX (49), sensor fibre II (62), delay optical fiber III (83), faraday rotation mirror FRM II (72), delay optical fiber
III (83), sensor fibre II (62), 2 × 1 bonder IX (49) and delay optical fiber II (82)；Loop optical signal path counterclockwise
For：Through postponing optical fiber II (82), 2 × 1 bonder IX (49), sensor fibre II (62), postponing optical fiber III (83), faraday
Revolving mirror FRMII (72), delay optical fiber III (83), sensor fibre II (62), 2 × 1 bonder IX (49)；Optical signal is via suitable
Return to 3 × 3 bonder II (52) after hour hands and loop counterclockwise to interfere, form 3 tunnel interference lights, respectively through 2 × 1 couplings
Device VII (47), 2 × 1 bonder VI (46) and 2 × 1 bonder VIII (48) are received by signal pickup assembly (9), then to three
Road optical signal is demodulated and analyzes and processes.
In the present embodiment, optical fiber is single-mode fiber, Fibre Optical Sensor partial-length 25km, and optical source wavelength is 1550nm, light source work(
Rate 19dB, optical fibre refractivity 1.5, light velocity of wave 2 × 10 in optical fiber8m/s.System sensing fiber section and non-transducing part are placed in
In puigging.
Same position is entered with the disturbance that line frequency is 200Hz, result, as shown in Fig. 2 Fig. 5, sets forth location Calculation
Result and location data mean value error.Fig. 2 gives 200Hz forcing frequency, the second delay optical fiber Ld2Not co-extensive during=0.5km
The location Calculation result of optical fiber ratio late, Fig. 3 gives 200Hz forcing frequency, the second delay optical fiber Ld2Different delays light during=1km
The location Calculation result of fine ratio, Fig. 4 gives 200Hz forcing frequency, the second delay optical fiber Ld2Different delays optical fiber during=0.5km
The location Calculation mean bias of ratio, Fig. 5 gives 200Hz forcing frequency, the second delay optical fiber Ld2Different delays optical fiber during=1km
The location Calculation mean bias of ratio.Can be seen that for disturbing signal by the datagram of Fig. 2 Fig. 5, satisfaction can be obtained real
When monitor and reach the positioning result of early warning requirement, from suitable delay optical fiber and postpone optical fiber ratio and can improve low frequency is believed
Number Detection results and the computational accuracy to disturbance location.
By above-mentioned analysis, the disturbing signal of monitoring system monitoring can obtain the result of satisfaction in lower frequency,
Outer disturbance is stronger, and the disturbing signal intensity of generation is higher, and monitoring effect is better.From the graph, it is apparent that by adopting
The monitoring pipeline safety system of the linear type Sagnac interferometer based on 3 × 3 bonders can be along the line to pipeline outer disturbance letter
Number carry out real-time monitoring and be more precisely located, be effectively improved the monitoring effect of pipe safety.
Claims (2)
1. the linear type Sagnac monitoring pipeline safety system Ji Yu 3 × 3 bonders, is divided into major loop and auxiliary loop two parts；
It include light source (1), 2 × 1 bonder I (41), polarizer I (21), optoisolator I (31), 2 × 1 bonder II (42), 3 × 3
Bonder I (51), 2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), delay optical fiber I
(81), 2 × 1 bonder III (43), 2 × 1 bonder IV (44)；Polarizer II (22), optoisolator II (32), 2 × 1 couplings
Device VI (46), 3 × 3 bonder II (52), postpone optical fiber II (82), 2 × 1 bonder IX (49), sensor fibre II (62), postpone
Optical fiber III (83), faraday rotation mirror FRM II (72), 2 × 1 bonder VII (47), 2 × 1 bonder VIII (48) and letter
Number harvester (9)；It is characterized in that：The laser that light source (1) sends is by by 2 × 1 bonder I (41) light splitting, entering respectively
Enter major loop and auxiliary loop；Major loop light through polarizer I (21) and optoisolator I (31), by 2 × 1 bonder II (42)
Entrance 3 × 3 bonder I (51) form two light circuit structures afterwards and form loop clockwise and loop counterclockwise respectively；Clockwise
Loop optical signal path is：2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), sensor fibre
I (61), 2 × 1 bonder V (45) and delay optical fiber I (81)；Loop optical signal path is counterclockwise：Through postponing optical fiber I
(81), 2 × 1 bonder V (45), sensor fibre I (61), faraday rotation mirror FRM I (71), sensor fibre I (61), 2 × 1 couplings
Clutch V (45)；Optical signal interferes via returning to 3 × 3 bonder I (51) behind loop clockwise and anticlockwise, forms 3 tunnels and does
Relate to light, respectively through 2 × 1 bonder III (43), 2 × 1 through bonder II (42) and 2 × 1 bonder IV (44) by signals collecting
Device (9) receives, and then three road optical signals is demodulated and analyzes and processes；Auxiliary loop light through polarizer II (22) and light every
From device II (32), enter 3 × 3 bonder II (52) by 2 × 1 bonder VI (46) and form two light circuit structures shape respectively afterwards
Become loop clockwise and loop counterclockwise；Loop optical signal path is clockwise：2 × 1 bonder IX (49), sensor fibre II
(62), postpone optical fiber III (83), faraday rotation mirror FRM II (72), postpone optical fiber III (83), sensor fibre II (62), 2
× 1 bonder IX (49) and delay optical fiber II (82)；Loop optical signal path is counterclockwise：Through delay optical fiber II (82), 2 ×
1 bonder IX (49), sensor fibre II (62), delay optical fiber III (83), faraday rotation mirror FRMII (72), delay optical fiber
III (83), sensor fibre II (62), 2 × 1 bonder IX (49)；Optical signal via returning to 3 behind loop clockwise and anticlockwise ×
3 bonder II (52) interfere, and form 3 tunnel interference lights, respectively through 2 × 1 bonder VII (47), 2 × 1 bonder VI
(46) and 2 × 1 bonder VIII (48) is received by signal pickup assembly (9), then three road optical signals is demodulated and analyzes
Process.
2. the linear type Sagnac monitoring pipeline safety system being based on 3 × 3 bonders according to claim 1, its feature
It is：Major loop sensor fibre I (61) is laid along monitored pipeline radial direction, and places faraday rotation mirror in monitoring terminal
FRM I (71) is to form linear structure；Auxiliary loop sensor fibre II (62) is laid along monitored pipeline radial direction, and in prison
Survey terminal and place faraday rotation mirror FRM II (72) after postponing optical fiber III (83) to form linear structure；Sense light
Fine I (61) and sensor fibre II (62) need to be pasted together parallel to ensure to monitor condition to same signal source for identical；
Main in this monitoring system, under auxiliary two loops safety monitoring is carried out to same pipeline, need not single phase-modulator, simplification light
Line structure, eliminates signal attenuation phenomenon and the reciprocity effect existing that monitoring system produces, it is to avoid during demodulation process, partly light is believed
Number loss, reduce effect of polarization, expand the frequency range that can monitor, improve monitoring accuracy and locating effect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2752686C1 (en) * | 2020-12-29 | 2021-07-29 | Андрей Андреевич Жирнов | Distributed vibration sensor based on sanyac interferometer with increased accuracy of impact coordinate determination |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105443991B (en) * | 2015-11-10 | 2017-10-20 | 中国计量学院 | A kind of ocean top-tensioned standpipe leakage monitor of interference type distributed optical fiber |
| CN108131569A (en) * | 2018-01-10 | 2018-06-08 | 浙江工业大学 | A kind of sea-bottom natural gas line leakage experiment porch and its data processing method |
| CN112880711B (en) * | 2021-01-18 | 2023-07-04 | 合肥工业大学 | Distributed optical fiber sensing method and system based on double pulse modulation |
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| CN1932369A (en) * | 2006-09-08 | 2007-03-21 | 北京工业大学 | Pipeline leakage monitor based on sagnac optical fiber interferometer |
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| CN102313141A (en) * | 2011-09-16 | 2012-01-11 | 电子科技大学 | Optical fiber vibration sensing system for pipeline leakage detection |
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| CN1932369A (en) * | 2006-09-08 | 2007-03-21 | 北京工业大学 | Pipeline leakage monitor based on sagnac optical fiber interferometer |
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