CN105757463B - FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors - Google Patents
FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors Download PDFInfo
- Publication number
- CN105757463B CN105757463B CN201610288991.7A CN201610288991A CN105757463B CN 105757463 B CN105757463 B CN 105757463B CN 201610288991 A CN201610288991 A CN 201610288991A CN 105757463 B CN105757463 B CN 105757463B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- coupler
- signal
- fiber
- faraday rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
Landscapes
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Optical Communication System (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a kind of FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors, including sensing optical fiber detecting system, signal demodulating system, signal communication and processing system, signal analysis and man-machine interactive system, sensing optical fiber detecting system includes ASE power light sources, the first single-mode fiber, optoisolator, the second single-mode fiber, the first coupler, delay optical fiber, phase-modulator, Polarization Controller, the second coupler, the first sensing optical fiber and the second sensing optical fiber.Optical signals light source is sent to be detected by sensing optical fiber detecting system to pipeline, again electric signal is converted optical signals to by optical-electrical converter, then signal is demodulated, then passes to computer by communication system after DSP is handled and carry out signal analysis and man-machine interaction.Apparatus of the present invention have more preferable detection sensitivity more suitable for detecting underwater long-distance transportation through pipeline, and have more constant sensing light path, reduce and demodulate difficulty.
Description
Technical field
The invention belongs to pipeline leakage testing field, more particularly to one kind is based on 2 × 2 couplers and double faraday rotation mirrors
FDDI FDM Fiber Duct detection means.
Background technology
With the lifting that people live, pipeline becomes to have increasing need for, and underwater oil gas is transported to from natural gas line
The conveying of pipeline, or even pipeline of West-East National Gas Transmission Project etc..But our securities to pipeline also have it is higher
Requirement, therefore the detection whether leaked for pipeline is particularly important.
Underwater long-distance pipeline of the Chinese invention patent application 201110302312.4 based on mixed interference type distribution type fiber-optic
Leak detecting device, wherein entirely sensing core is to be laid on by a sensing optical fiber in the interlayer on pipeline one side, and
A piece sensing optical fiber senses whole pipeline, and its shortcoming is that leakage point revolves apart from faraday if when carrying out long-distance pipe detection
The distance of tilting mirror is more remote, and the sensitivity of whole detecting system is lower.Because faraday rotation mirror is now carried out at one of pipeline
Leakage point is when close to faraday rotation mirror position and away from faraday rotation mirror position phase during long-distance pipe leak detection
It can be substantially reduced than its detection sensitivity, the defects of thus bringing the wrong report of pipe leakage or be difficult to measure.
Chinese invention patent application 200610113044.0 is based on Sagnac fibre optic interferometers and carries out pipeline leakage testing, though
The right transducing part for employing two independent sensing optical fibers and forming system, but its system complex, are formed using multiple couplers,
Cost is high, and structure is excessively complicated, while requires high to use environment, is unfavorable for quickly coming into operation.
The content of the invention
The shortcomings that it is an object of the invention to overcome the shortcomings of present technology and design, there is provided one kind is based on 2 × 2 couplers
With the FDDI FDM Fiber Duct detection means of double faraday rotation mirrors.This structure of the detecting device is simple, beneficial to optical fiber it is different put arrangement,
And making light path simpler, fixed, disposing way is more favorable for submarine pipeline detection, especially in long term distance pipeline
In, increase detection sensitivity, prevent detecting leakage by mistake.
The purpose of the present invention is achieved through the following technical solutions：One kind is revolved based on 2 × 2 couplers and double faraday
The FDDI FDM Fiber Duct detection means of tilting mirror, the device include sensing optical fiber detecting system, signal demodulating system, signal communication and processing
System and signal analysis and man-machine interactive system.Wherein sensing optical fiber detecting system includes ASE power light sources, the first single-mode optics
Fibre, optoisolator, the second single-mode fiber, the first coupler, delay optical fiber, phase-modulator, Polarization Controller, the second coupling
Device, the first sensing optical fiber, the second sensing optical fiber, the first faraday rotation mirror, the second faraday rotation mirror, the 3rd single-mode fiber and
Optical-electrical converter；Signal demodulating system includes signal amplification module, the first demodulation module, the second demodulation module, subtracter and product
Divide device；Signal communication and processing system include DSP signal processing modules and the first communication module；Signal analysis and man-machine interaction system
System includes the second communication module and computer.
The optical signal that the power light source of described sensing optical fiber detecting system is sent by the first single-mode fiber and light every
From an input port A connection of device, first port that the B ports of optoisolator pass through the second single-mode fiber and the first coupler
D connections, the second port E of the first coupler are connected to the first port K of the second coupler after being connected with delay optical fiber, and first
3rd port F of coupler is sequentially connected the second port H with the second coupler after phase-modulator and Polarization Controller respectively
Connection, the 3rd port I of the second coupler are connected by the first sensing optical fiber with the first faraday rotation mirror, the second coupler
4th port J is connected by the second sensing optical fiber with the second faraday rotation mirror；4th port C of the first coupler passes through the 3rd
Single-mode fiber is connected with optical-electrical converter, and optical-electrical converter output is connected with signal amplification module, the output point of signal amplification module
It is not connected with the first demodulation module and the second demodulation module；First demodulation module and the output of the second demodulation module pass through subtraction respectively
It is connected after device and integrator with DSP signal processing modules, the output of DSP signal processing modules is connected with the first communication module, and first
Communication module output is connected with the second communication module；The output of second communication module is connected with computer.
Further, the first described faraday rotation mirror and the second faraday rotation mirror are respectively placed in the both ends of pipeline,
First sensing optical fiber and the second sensing optical fiber the fitting duct wall among pipeline extend round about, and respectively with the first method
Revolving mirror and the second faraday rotation mirror is drawn to connect.
Further, the first described sensing optical fiber and the second sensing optical fiber are fitted in pipeline both sides arrangement respectively.
Location technology of the invention according to its detecting system, in phase signalDemodulate after coming, it is carried out in Fu
Leakage point and faraday rotation mirror distance L is calculated in leaf transformationxWith leakage point signal frequency fsRelation, can be leaked
Length L of the point apart from faraday rotation mirrorxIt is proportional with the light velocity c in vacuum, respectively with leakage signal zero frequency fsWith
The refractive index n of optical fiber core is inversely.Adjust the distance again and take differential to obtain leakage point distance LxWith detection sensitivity relation.It can obtain
Leakage point is inverse relation with faraday rotation mirror distance, so in order to increase its detection sensitivity, to be examined in long-distance pipe
Reduce the distance of faraday rotation mirror and leakage point in the case of survey as far as possible, i.e., if pipeline be divided into two detection, change one
For two, the thinking to break the whole up into parts can be with ingenious increase system sensitivity.
The beneficial effects of the invention are as follows：The present apparatus increases the mixing of moral principle of interference and Sagnac interference effect using Mach
Principle of interference, it is simple in construction, and most common optical component is used, also reduce assembling difficulty while reducing cost.
Fitting duct wall extends two sensing optical fibers of the present apparatus round about among pipeline respectively, and leads to pipeline two respectively
The first faraday rotation mirror and the second faraday rotation mirror of head, pipeline is divided into two from centre and detected respectively, significantly
Pipe detection length is reduced, reduces the distance of detection leakage point and faraday rotation mirror, increases sensing sensitivity.And two
Sensing optical fiber is fitted in pipeline both sides arrangement respectively, the vacancy of pipeline intermediate sense optical fiber Disengagement zone is avoided, so as to send out in time
Existing leakage phenomenon, prevent leakage wrong report.Simultaneously in the case of using a plurality of sensing optical fiber, sensing optical fiber detection part uses 2
× 2 couplers reduce the use of optical component, also reduce the complexity of framework while reducing cost.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention；
Fig. 2 is the schematic diagram of light path one；
Fig. 3 is the schematic diagram of light path two；
Fig. 4 is the schematic diagram of light path three；
Fig. 5 is the schematic diagram of light path four；
In figure, sensing optical fiber detecting system 1, signal demodulating system 2, signal communication and processing system 3, signal analysis and people
Machine interactive system 4, ASE power light sources 5, the first single-mode fiber 6, optoisolator 7, the second single-mode fiber 8, the first coupler 9,
Postpone optical fiber 10, phase-modulator 11, Polarization Controller 12, the second coupler 13, the first sensing optical fiber 14, the second sensing optical fiber
15, the first faraday rotation mirror 16, the second faraday rotation mirror 17, the 3rd single-mode fiber 18, optical-electrical converter 19, signal amplification
Module 20, the first demodulation module 21, the second demodulation module 22, subtracter 23, integrator 24, DSP signal processing modules 25, first
Communication module 26, the second communication module 27, computer 28.
Embodiment
The present invention is described in detail below according to accompanying drawing, the purpose of the present invention and effect will be apparent.
As shown in figure 1, a kind of FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors of the present invention,
Including：Sensing optical fiber detecting system 1, signal demodulating system 2, signal communication and processing system 3, signal analysis and man-machine interaction system
System 4；Wherein, sensing optical fiber detecting system 1 includes ASE power light sources 5, the first single-mode fiber 6, optoisolator 7, the second single mode
Optical fiber 8, the first coupler 9, delay optical fiber 10, phase-modulator 11, Polarization Controller 12, the second coupler 13, first sensing
Optical fiber 14, the second sensing optical fiber 15, the first faraday rotation mirror 16, the second faraday rotation mirror 17, the and of the 3rd single-mode fiber 18
Optical-electrical converter 19；Signal demodulating system 2 includes signal amplification module 20, the first demodulation module 21, the second demodulation module 22, subtracted
Musical instruments used in a Buddhist or Taoist mass 23 and integrator 24；Signal communication and processing system 3 include the communication module 26 of DSP signal processing modules 25 and first；Letter
Number analysis and man-machine interactive system 4 include the second communication module 27 and computer 28.
The optical signal that the power light source 5 of described sensing optical fiber detecting system 1 is sent passes through the first single-mode fiber 6 and light
The input port A connections of isolator 7, the output port B of optoisolator 7 pass through the second single-mode fiber 8 and the first coupler 9
Single port D connections, the second port E of the first coupler 9 are connected to the of the second coupler 13 after being connected with delay optical fiber 10
Single port K, the 3rd port F of the first coupler 9 are coupled after being sequentially connected phase-modulator 11 and Polarization Controller 12 with second
The second port H connections of device 13, the 3rd port I of the second coupler 13 pass through the first sensing optical fiber 14 and the first Faraday rotation
Mirror 16 is connected, and the 4th port J of the second coupler 13 is connected by the second sensing optical fiber 15 with the second faraday rotation mirror 17；The
4th port C of one coupler 9 is connected by the 3rd single-mode fiber 18 with optical-electrical converter 19, the output of optical-electrical converter 19 and letter
Number amplification module 20 is connected, and signal amplification module 20 exports to be connected with the first demodulation module 21 and the second demodulation module 22 respectively；
First demodulation module 21 and the second demodulation module 22 export respectively by after subtracter 23 and integrator 24 with DSP signal transacting moulds
Block 25 is connected, and DSP signal processing modules 25 are connected with the first communication module 26, the first communication module 26 and the second communication module 27
Connection；Second communication module 27 is connected with computer 28.
As shown in figure 1, the operation principle of the present invention is：Sensing optical fiber detecting system 1 using Mach increase moral principle of interference and
Sagnac mixed interference type distributed fibre optic sensing framework, whole transducing part is by two light for being fitted in pipeline both sides respectively
Fibre is formed, and enters optoisolator 7 by the first single-mode fiber 6 by the light that ASE power light sources 5 are sent during detection, from optically isolated
By the second single-mode fiber 8 after the B mouths injection of device 7, the first coupler 9, the luminous power of the first coupler 9 output are entered by D mouths
By 1:1 two light paths of output, wherein (with reference to the figure 2) light of path one are exported by postponing optical fiber 10 from the E ports of the first coupler 9
The second coupler 13 is input to from K ports afterwards, then output enters the first sensing optical fiber from the I ports of the second coupler 13
14, the first faraday rotation mirror 16 is entered by the first sensing optical fiber 14, entered again by the first sensing optical fiber 14 after being reflected off
Enter the second coupler 13, entered respectively by Polarization Controller 12 and phase-modulator 11 after the H mouths output of the second coupler 13
Enter to the first coupler 9, (wherein have part light path by being exported after the second coupler 13 from K ports into after delay optical fiber 10
The first coupler 9 is entered back into, does not now meet zero optical path difference condition with light path one, two, so without interference, therefore do not examine
Consider；Also there is part return light path by entering optoisolator 7 from the output of D mouths during the first coupler 9, now by optoisolator 7
Obstruction prevent damage light source, be also not considered) with path two interfered in the first coupler 9 after by the 3rd single-mode fiber
18 enter optical-electrical converter 19.
With reference to figure 3, light path two, from the F ports of the first coupler 9, output passes through phase-modulator 11 and polarization to light respectively
Controller 12 enters the second coupler 13, and then from the I ports of the second coupler 13, output enters the first sensing optical fiber 14,
First faraday rotation mirror 16 is entered by the first sensing optical fiber 14, enters the by the first sensing optical fiber 14 again after being reflected off
Two couplers 13, the first coupler 9 is entered by postponing optical fiber 10 after the K mouths output of the second coupler 13, (wherein has portion
Path-splitting after the second coupler 13 from H ports by exporting respectively by being entered back into after Polarization Controller 12 and phase-modulator 11
First coupler 9, zero optical path difference condition now is not met with light path one, two, so without interference, therefore do not consider；Also have
Part return light path now hinders to prevent by entering optoisolator 7 from the output of D mouths during the first coupler 9 by optoisolator 7
Damage light source, be also not considered) interfered with path one in the first coupler 9 after entered by the 3rd single-mode fiber 18
Optical-electrical converter 19.
With reference to figure 4, light path three, light is defeated from K ports after optical fiber 10 by postponing from the output of the E ports of the first coupler 9
Enter to the second coupler 13, then from the J ports of the second coupler 13, output enters the second sensing optical fiber 15, passes through the second sense
Light-metering fibre 15 enters the second faraday rotation mirror 17, enters the second coupler by the second sensing optical fiber 15 again after being reflected off
13, the first coupling is entered by Polarization Controller 12 and phase-modulator 11 respectively after the H mouths output of the second coupler 13
Device 9, (wherein there is part light path by entering back into the first coupling after being exported after the second coupler 13 from K ports into delay optical fiber 10
Clutch 9, zero optical path difference condition now is not met with light path three, four, so without interference, therefore do not consider；Also part returns
Recovering light path now hinders to prevent from damaging light by entering optoisolator 7 from the output of D mouths during the first coupler 9 by optoisolator 7
Source, be also not considered) with path four interfered in the first coupler 9 after by the 3rd single-mode fiber 18 enter photoelectricity turn
Optical signal is changed into electric signal by parallel operation 19, then by signal amplification module 20 by signal enhanced processing, then is divided to two by signal
Path respectively enters the first demodulation module 21 and the second demodulation module 22, then enters back into subtracter 23 and integrator 24 is done accordingly
Processing reaches demodulation effect, enters back into DSP signal processing modules 25 and demodulated signal is sampled to complete signal transacting and let out
Leak source position calculates, and then passes the signal to computer 28 by the first communication module 26 and the second communication module 27 and is divided
Analysis processing and man-machine interaction.
With reference to figure 5, light path four, from the F ports of the first coupler 9, output passes through phase-modulator 11 and polarization to light respectively
Controller 12 enters the second coupler 13, and then from the J ports of the second coupler 13, output enters the second sensing optical fiber 15,
Second faraday rotation mirror 17 is entered by the second sensing optical fiber 15, enters the by the second sensing optical fiber 17 again after being reflected off
Two couplers 13, the first coupler 9 is entered by postponing optical fiber 10 after the K mouths output of the second coupler 13, (wherein has portion
Path-splitting after the second coupler 13 from H ports by exporting respectively by being entered back into after Polarization Controller 12 and phase-modulator 11
First coupler 9, zero optical path difference condition now is not met with light path three, four, so without interference, therefore do not consider；Also have
Part return light path now hinders to prevent by entering optoisolator 7 from the output of D mouths during the first coupler 9 by optoisolator 7
Damage light source, be also not considered) interfered with path three in the first coupler 9 after entered by the 3rd single-mode fiber 18
Optical signal is changed into electric signal by optical-electrical converter 19, then by signal amplification module 20 by signal enhanced processing, then by signal
It is divided to two paths to respectively enter the first demodulation module 21 and the second demodulation module 22, then enters back into subtracter 23 and integrator 24
Do respective handling and reach demodulation effect, enter back into DSP signal processing modules 25 and demodulated signal is sampled to complete at signal
Reason and leakage point position calculate, and then pass the signal to computer 28 by the first communication module 26 and the second communication module 27
Analyzed and processed and man-machine interaction.
The pipeline leakage testing principle of the device is：When underground or submarine pipeline somewhere leak, leak fluid with
The friction of leakage hole wall can produce stress wave on tube wall, and now the sensing optical fiber that be laid on natural gas line tube wall can be produced
Raw disturbance, is modulated to the light phase by being transmitted in 15 two sensing optical fibers of the first sensing optical fiber 14 and the second sensing optical fiber
Its is set to produce phase difference, delay optical fiber 10 is in order that generation time when light path one or two or the two-beam of light path three or four pass through leakage point
Difference, two-beam generation phase difference meets zero optical path difference condition in same sensing optical fiber, so being sent out when being coupled in coupler
Raw interference.When No leakage occurs, it is consistent with the two phase place of light two of the second sensing optical fiber 15 to respectively enter the first sensing optical fiber 14, no
Interfere.Mould now can be amplified to determine leakage situation, then by signal by detecting the interference signal in sensing optical fiber
Block 20 is divided to two bars to respectively enter the first demodulation module 21, the second demodulation module 22, then carries out subtraction product to its demodulated signal
Office is managed, and then demodulated signal is sampled by DSP signal processing modules 25 and completes signal transacting and leakage point position is calculated,
Computer 27 is transmitted a signal to by the first communication module 25 and the second communication module 26 so as to carry out people's work point of signal again
Analysis and processing, realize pipeline leakage testing.
Claims (2)
1. FDDI FDM Fiber Duct detection means of the one kind based on 2 × 2 couplers and double faraday rotation mirrors, it is characterised in that including：Sense
Survey fiber optic detection system (1), signal demodulating system (2), signal communication and processing system (3), signal analysis and man-machine interaction system
Unite (4)；Wherein, sensing optical fiber detecting system (1) includes ASE power light sources (5), the first single-mode fiber (6), optoisolator
(7), the second single-mode fiber (8), the first coupler (9), delay optical fiber (10), phase-modulator (11), Polarization Controller (12),
Second coupler (13), the first sensing optical fiber (14), the second sensing optical fiber (15), the first faraday rotation mirror (16), the second method
Draw revolving mirror (17), the 3rd single-mode fiber (18) and optical-electrical converter (19)；Signal demodulating system (2) includes signal amplification mould
Block (20), the first demodulation module (21), the second demodulation module (22), subtracter (23) and integrator (24)；Signal communication and place
Reason system (3) includes DSP signal processing modules (25) and the first communication module (26)；Signal analysis and man-machine interactive system (4)
Including the second communication module (27) and computer (28)；
The optical signal that the power light source (5) of the sensing optical fiber detecting system (1) is sent passes through the first single-mode fiber (6) and light
The input port A connections of isolator (7), the output port B of optoisolator (7) are coupled by the second single-mode fiber (8) with first
The first port D connections of device (9), the second port E of the first coupler (9) are connected to second with postponing after optical fiber (10) is connected
The first port K of coupler (13), the 3rd port F of the first coupler (9) are sequentially connected phase-modulator (11) and polarization control
Second port H of the device (12) processed afterwards with the second coupler (13) is connected, and the 3rd port I of the second coupler (13) passes through the first sense
Light-metering fibre (14) is connected with the first faraday rotation mirror (16), and the 4th port J of the second coupler (13) passes through the second sensing light
Fine (15) are connected with the second faraday rotation mirror (17)；4th port C of the first coupler (9) passes through the 3rd single-mode fiber (18)
It is connected with optical-electrical converter (19), optical-electrical converter (19) output is connected with signal amplification module (20), signal amplification module
(20) output is connected with the first demodulation module (21) and the second demodulation module (22) respectively；First demodulation module (21) and the second solution
Mode transfer block (22) output is connected with DSP signal processing modules (25) afterwards by subtracter (23) and integrator (24) respectively, DSP letters
Number processing module (25) is connected with the first communication module (26), and the first communication module (26) is connected with the second communication module (27)；
Second communication module (27) is connected with computer (28)；
Described the first faraday rotation mirror (16) and the second faraday rotation mirror (17) is respectively placed in the both ends of pipeline, the first sense
Light-metering is fine and the second sensing optical fiber fitting duct wall among pipeline extends round about, and is revolved respectively with the first faraday
Tilting mirror and the connection of the second faraday rotation mirror.
A kind of 2. FDDI FDM Fiber Duct detection dress based on 2 × 2 couplers and double faraday rotation mirrors according to claim 1
Put, it is characterised in that described the first sensing optical fiber (14) and the second sensing optical fiber (15) is fitted in pipeline both sides arrangement respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610288991.7A CN105757463B (en) | 2016-05-04 | 2016-05-04 | FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610288991.7A CN105757463B (en) | 2016-05-04 | 2016-05-04 | FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105757463A CN105757463A (en) | 2016-07-13 |
| CN105757463B true CN105757463B (en) | 2018-03-16 |
Family
ID=56323369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610288991.7A Active CN105757463B (en) | 2016-05-04 | 2016-05-04 | FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105757463B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11237025B2 (en) * | 2017-07-26 | 2022-02-01 | Terra15 Pty Ltd | Distributed optical sensing systems and methods |
| CN110108310A (en) * | 2019-03-25 | 2019-08-09 | 中国船舶重工集团公司第七一五研究所 | Interference type optical fiber sensor high-frequency phase generates carrier wave loading device |
| CN112902028B (en) * | 2019-12-03 | 2022-05-10 | 中国石油天然气股份有限公司 | Leak detection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0989199A (en) * | 1995-09-20 | 1997-03-31 | Tokyo Gas Co Ltd | Gas pipe housing optical fiber cable |
| CN201003690Y (en) * | 2006-09-08 | 2008-01-09 | 北京工业大学 | Pipe leakage monitoring device based on Sagnac optical fiber interferometer |
| CN102352963A (en) * | 2011-10-09 | 2012-02-15 | 中国计量学院 | Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline |
| CN202252873U (en) * | 2011-10-09 | 2012-05-30 | 中国计量学院 | Underwater long gas pipeline leakage detection device for interferometric distributed optical fibers |
| CN203115505U (en) * | 2013-01-16 | 2013-08-07 | 上海健驰物联网科技有限公司 | Optical fiber leak detection device for underwater long-distance pipeline |
| CN203215293U (en) * | 2013-04-16 | 2013-09-25 | 新疆美特智能安全工程股份有限公司 | Long distance oil-gas pipeline safety on-line monitoring system based on distribution type optical fiber sensing |
-
2016
- 2016-05-04 CN CN201610288991.7A patent/CN105757463B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0989199A (en) * | 1995-09-20 | 1997-03-31 | Tokyo Gas Co Ltd | Gas pipe housing optical fiber cable |
| CN201003690Y (en) * | 2006-09-08 | 2008-01-09 | 北京工业大学 | Pipe leakage monitoring device based on Sagnac optical fiber interferometer |
| CN102352963A (en) * | 2011-10-09 | 2012-02-15 | 中国计量学院 | Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline |
| CN202252873U (en) * | 2011-10-09 | 2012-05-30 | 中国计量学院 | Underwater long gas pipeline leakage detection device for interferometric distributed optical fibers |
| CN203115505U (en) * | 2013-01-16 | 2013-08-07 | 上海健驰物联网科技有限公司 | Optical fiber leak detection device for underwater long-distance pipeline |
| CN203215293U (en) * | 2013-04-16 | 2013-09-25 | 新疆美特智能安全工程股份有限公司 | Long distance oil-gas pipeline safety on-line monitoring system based on distribution type optical fiber sensing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105757463A (en) | 2016-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105757463B (en) | FDDI FDM Fiber Duct detection means based on 2 × 2 couplers and double faraday rotation mirrors | |
| CN102352963B (en) | Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline | |
| CN104297642B (en) | A kind of optical fiber partial discharge detecting system | |
| EP1649310A2 (en) | Multimode fiber optic intrusion detection system | |
| EP3882594A1 (en) | Planar optical waveguide device, and temperature measurement system | |
| CN107063431A (en) | A kind of optical fiber vibration sensing system and method based on double light path | |
| CN103698049B (en) | Distributed Measurement System based on Brillouin scattering and method | |
| CN105699050A (en) | Combined type distributed optical fiber sensing method and system integrated with chaotic light source and coherent detection | |
| CN109150311A (en) | A kind of multi-parameter sensing network based on fiber optic loop cavity attenuation and vibration technique | |
| CN101334331B (en) | Distributed Optical Fiber Pipeline Safety Early Warning System Based on Phase Interference | |
| CN202252873U (en) | Underwater long gas pipeline leakage detection device for interferometric distributed optical fibers | |
| CN104456091B (en) | Fiber-optic interferometer CO2 pipe leak detection device based on 3*3 couplers | |
| CN210780795U (en) | Distributed optical fiber multi-parameter measurement light distribution control device of power optical cable network | |
| CN116972343A (en) | Optical fiber sensing system suitable for pipeline leakage monitoring | |
| CN106197904A (en) | Distributed optical fiber pipeline safety monitoring assembly | |
| CN103308148B (en) | Linear multi-channel fiber acoustic vibration sensing device and method | |
| CN203115505U (en) | Optical fiber leak detection device for underwater long-distance pipeline | |
| CN102087356B (en) | Method for processing two superposed composite signals with fixed time delay difference | |
| CN104180832A (en) | Distributed orthogonal vector disturbance sensing system based on four-core optical fiber | |
| CN108827913A (en) | A kind of multiple spot humidity sensor network based on fiber optic loop cavity-type BPM | |
| CN206292019U (en) | Distributed fiber-optic sensor monitoring system | |
| CN209689738U (en) | A kind of device improving φ-OTDR frequency response | |
| CN201096589Y (en) | Distributed Optical Fiber Pipeline Safety Early Warning System Based on Phase Interference | |
| CN103674080A (en) | Optical fiber interference method and system aimed at weak signal detection | |
| CN103528666A (en) | Long-distance optical fiber vibration detection device and method on basis of Sagnac interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |