CN207180866U - A kind of distributed vibration positioning sensor system based on MZ interference and Φ OTDR - Google Patents
A kind of distributed vibration positioning sensor system based on MZ interference and Φ OTDR Download PDFInfo
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- CN207180866U CN207180866U CN201720111206.0U CN201720111206U CN207180866U CN 207180866 U CN207180866 U CN 207180866U CN 201720111206 U CN201720111206 U CN 201720111206U CN 207180866 U CN207180866 U CN 207180866U
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- 238000000253 optical time-domain reflectometry Methods 0.000 title claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 4
- 230000001953 sensory effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 230000000747 cardiac effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The utility model is applied to sensory field of optic fibre,Provide a kind of distributed vibration positioning sensor system based on MZ interference and Φ OTDR,The system includes two lasing light emitters,One of lasing light emitter passes through pulse modulation module,Export pulse laser,The pulse laser is coupled into a branch of mix through the first coupler with another laser and is divided into two beam hybrid lasers through the second coupler again,Exported respectively by sensor fibre and reference optical fiber to the 3rd coupler,Backward Rayleigh scattering light in sensor fibre and reference optical fiber not only can produce self-interference in sensor fibre or reference optical fiber,Interference can also be produced when being back to the second coupler,Traditional optical fiber vibration sensing system based on Φ OTDR is solved the problems, such as since it is desired that producing the line width in self-interference requirement first laser source,In addition,The system not only can be positioned easily to vibration,Also there is very high frequency response.
Description
Technical field
The utility model belongs to sensory field of optic fibre, there is provided a kind of distributed vibration based on MZ interference and Φ-OTDR
Positioning sensor system.
Background technology
Optical fiber vibration sensing has that high sensitivity, anti-electromagnetic interference capability are strong, dynamic range is big, terminal structure is simple, hidden
The characteristics of covering property is good, corrosion-resistant, environmental suitability is strong, available for heavy construction is live and great politics, economy, military base
Circumference security protection, therefore, research distributed optical fiber sensing system is one and has very much application prospect and the problem of practical significance.
At present, distributed optical fiber vibration sensing technology based on phase sensitive optical time domain reflection technology (Φ-OTDR) due to
Its investigative range is big (can generally detect tens kilometers), high sensitivity, and simple to vibration source positioning (time-domain curve of detection can
To be simply converted into position-light intensity) the advantages that, enjoy the concern of people.But in order to prevent front and rear pulse source signal
Light interferes and limits its frequency response, can not obtain the vibration information details of high frequency, the self-interference principle of the technology will
Ask the line width of light source sufficiently narrow.
Utility model content
The utility model embodiment provides a kind of distributed vibration positioning sensor system based on MZ interference and Φ-OTDR,
Aim to solve the problem that the distributed optical fiber vibration sensing technology of phase sensitive optical time domain reflection technology (Φ-OTDR) will to the line width of light source
Ask the problem of high.
The utility model is achieved in that a kind of distributed vibration orientation sensing system based on MZ interference and Φ-OTDR
System, the system by two lasing light emitters, pulse modulation module, three couplers, sensor fibre, reference optical fiber, two circulators,
Two Fiber Bragg Grating FBGs, two Photoelectric Detection modules and signal processing module composition, the output end in first laser source and institute
The input connection of pulse modulation module is stated, the output end and the first coupler of second laser source and the pulse modulation module are defeated
Inbound port is connected, and the output port of first coupler is connected by optical fiber with the input port of the second coupler, and described the
First, second output port of two couplers passes through the sensor fibre and reference optical fiber and two input ports of the 3rd coupler
Connection, the 3rd coupler output port connection it is described second annular port A, the port B of second circulator and
Port C is sequentially connected the second Fiber Bragg Grating FBG, the second Photoelectric Detection module, the 3rd output port of second coupler
Connect the port a of first annular device, the port b and port c of the first ring circulator are sequentially connected the first optical fiber Bragg light
Grid, the first Photoelectric Detection module, the other end of the first, second Photoelectric Detection module are connected with the signal processing module；
The first laser source is different from the centre wavelength in the second laser source.
Further, the centre wavelength in the first laser source is 1645nm, and the centre wavelength in the second laser source is
1550nm；The first Fiber Bragg Grating FBG reflection kernel wavelength is 1645nm, the second Fiber Bragg Grating FBG reflection
Centre wavelength is 1550nm；Or the centre wavelength in the first laser source is 1550nm, the middle cardiac wave in the second laser source
A length of 1450nm；The first Fiber Bragg Grating FBG reflection kernel wavelength is 1550nm, second Fiber Bragg Grating FBG
Reflection kernel wavelength is 1450nm.
Further, first coupler, described second and coupler and the 3rd coupler are 3db couplings
Device.
Backward Rayleigh scattering light in sensor fibre and reference optical fiber in the utility model not only can be in sensor fibre
Or self-interference is produced in reference optical fiber, interference can also be produced when being back to the second coupler；Solve tradition based on Φ-
OTDR optical fiber vibration sensing system since it is desired that the problem of producing self-interference and requiring the line width in first laser source, in addition,
The system not only can be positioned easily to vibration, also have very high frequency response.
Brief description of the drawings
Fig. 1 is the distributed vibration orientation sensing system based on MZ interference and Φ-OTDR that the utility model embodiment provides
System structural representation；
1. the first light source；2. secondary light source；3. pulse modulation module；4. the first coupler；5. the second coupler；6. sensing
Optical fiber；7. the 3rd coupler；8. the first circulator；9. the second circulator；10. the first Fiber Bragg Grating FBG；11. the second optical fiber
Bragg grating；12. the first Photoelectric Detection module；13. the second Photoelectric Detection module；14. signal processing module.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Fig. 1 is the knot of the distributed vibration positioning sensor system provided by the utility model based on MZ interference and Φ-OTDR
Structure schematic diagram, for convenience of description, the part related to the utility model is only shown.
Distributed vibration positioning sensor system based on MZ interference and Φ-OTDR is by two lasing light emitters (1；2), impulse modulation
Module (3), three couplers (4；5；7), two sensor fibre (6), reference optical fiber (not indicated in figure) circulators (8；9), two
Individual Fiber Bragg Grating FBG (10；11), two Photoelectric Detection modules (12；13) and signal processing module (14) forms, and first swashs
The output end of light source 1 is connected with the input of the pulse modulation module 3, second laser source 2 and the pulse modulation module 3
Output end is connected with the input port of the first coupler 3, and the output port of first coupler 3 passes through optical fiber and the second coupler
5 input port connection, first, second output port of second coupler 5 pass through the sensor fibre 6 and reference optical fiber
It is connected with two input ports of the 3rd coupler 7, the output port of the 3rd coupler connects the port of second annular 9
A, the port B and port C of second circulator are sequentially connected the second Fiber Bragg Grating FBG 11, the second Photoelectric Detection module
13, the 3rd output port of second coupler 5 connects the port a of first annular device 8, the end of the first ring circulator 8
Mouth b and port c is sequentially connected the first Fiber Bragg Grating FBG 10, the first Photoelectric Detection module 12, the first, second photoelectricity inspection
Survey module (12；13) the other end is connected with signal processing module 14.
In the utility model, the laser that first laser source 1 is launched is modulated into laser pulse once pulse modulation module 3,
The laser two that the laser pulse is launched with second laser source 2 is coupled into light beam hybrid laser through the first coupler 4, passes through optical fiber
The second coupler 5 is sent to, the beam hybrid laser is divided into two-way through the second coupler 5, passes through sensor fibre 6 and reference respectively
Optical fiber is sent to the 3rd coupler 7, and the 3rd coupler 7, which mixes the two-way to swash, is coupled into a branch of hybrid laser, while laser two
MZ interference is produced at the 3rd coupler 7, MZ interference signals light enters the port A of the second circulator 9 by optical fiber, through the second ring
The port B of shape device 9, filtered by the second Fiber Bragg Grating FBG 11, the second Fiber Bragg Grating FBG 11 is by corresponding to light source two
Laser reflection is detected through the first photodetector unit 12, is sent at signal processing module 14 to the port C of the second circulator 9
Reason, the flashlight of MZ interference carry abundant vibration detailed information, in that context it may be convenient to which vibration is positioned.
In addition, during mixing laser beam is sent to the 3rd coupler 7 by sensor fibre 6 and reference optical fiber, mixing swashs
Light produced in sensor fibre 6 and reference optical fiber after to Rayleigh scattering, can not only sensed to Rayleigh scattering light after this two-way
Self-interference is produced in optical fiber 6 or reference optical fiber, interference can also be produced when being back to the second coupler 5；Solves traditional base
In Φ-OTDR optical fiber vibration sensing system since it is desired that produce self-interference and require, the line width in first laser source 1 is asked
Topic, then interference light signal is with the port a for entering the first circulator 8, the first grating of the port b connections through the first circulator 8
The filtering of Bragg grating 10, the first fiber Bragg grating 10 reflex to laser one the port c of first annular device 8, through
The detection of one Photoelectric Detection module 12 is sent to data processing module 14 and handled.When flashlight based on Φ-OTDR can utilize light
Domain principle of reflection positions to vibration, also has very high frequency response.
In the utility model, first laser source 1 is different from the centre wavelength in second laser source 2；
In the utility model, first, second and third coupler (4；5；7) it is 3db couplers.
In the utility model, pulse modulation module 3 includes acousto-optic modulator and synchronous triggering exports；First Photoelectric Detection
The Photoelectric Detection module 13 of module 12 and second includes image intensifer, photodetector, analog-digital converter, signal processing module 14
It can be computer or computer and various MCU combination.
In the utility model, the centre wavelength in first laser source 1 is 1645nm, and the centre wavelength in second laser source 2 is
1550nm；The corresponding reflection kernel wavelength of first Fiber Bragg Grating FBG 10 is 1645nm, and the second Fiber Bragg Grating FBG 11 is anti-
Hit a length of 1550nm of cardiac wave；Or the centre wavelength in first laser source 1 is 1550nm, the centre wavelength in second laser source 2 is
1450nm；The corresponding reflection kernel wavelength of first Fiber Bragg Grating FBG 10 is 1550nm, and the second Fiber Bragg Grating FBG 11 is anti-
Hit a length of 1450nm of cardiac wave；
In the utility model, 1550nm and 1645nm combination and 1450nm and 1550nm combination can realize drawing
Graceful amplification, illustrate by taking 1450nm and 1550nm combination as an example, after the laser of 1450nm centre wavelengths enters optical fiber, can produce
Raw Raman scattering, its Stokes ratio centre wavelength use the laser of 1450nm centre wavelengths near 1550nm
Certain Raman amplifiction can be carried out to the faint Rayleigh scattering light of 1550nm centre wavelengths.In addition, the laser of the two wavelength
Relatively good acquisition, and Raman amplifiction function can be realized just.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of distributed vibration positioning sensor system based on MZ interference and Φ-OTDR, it is characterised in that the system is by two
Individual lasing light emitter, pulse modulation module, three couplers, sensor fibre, reference optical fiber, two circulators, two optical fiber Braggs
Grating, two Photoelectric Detection modules and signal processing module composition, two circulators include the first circulator and the second circulator,
The output end in first laser source is connected with the input of the pulse modulation module, second laser source and the pulse modulation module
Output end be connected with the first coupler input mouth, the output port of first coupler passes through optical fiber and the second coupler
Input port connection, first, second output port of second coupler by the sensor fibre and reference optical fiber with
The two input ports connection of 3rd coupler, the port A of output port the second circulator of connection of the 3rd coupler, second
The port B and port C of circulator are sequentially connected the second Fiber Bragg Grating FBG, the second Photoelectric Detection module, second coupling
Port a, the port b and port c of first circulator that 3rd output port of device connects the first circulator are sequentially connected the
One Fiber Bragg Grating FBG, the first Photoelectric Detection module, the other end and the signal of the first, second Photoelectric Detection module
Processing module connects；
The first laser source is different from the centre wavelength in the second laser source.
2. the distributed vibration positioning sensor system based on MZ interference and Φ-OTDR, its feature exist as claimed in claim 1
In the centre wavelength in the first laser source is 1645nm, and the centre wavelength in the second laser source is 1550nm；Described first
Fiber Bragg Grating FBG reflection kernel wavelength is 1645nm, and the second Fiber Bragg Grating FBG reflection kernel wavelength is
1550nm；
Or the centre wavelength in the first laser source is 1550nm, the centre wavelength in the second laser source is 1450nm；Institute
It is 1550nm to state the first Fiber Bragg Grating FBG reflection kernel wavelength, and the second Fiber Bragg Grating FBG reflection kernel wavelength is
1450nm。
3. the distributed vibration positioning sensor system based on MZ interference and Φ-OTDR as claimed in claim 1 or 2, its feature
It is, first coupler, second coupler and the 3rd coupler are 3db couplers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720111206.0U CN207180866U (en) | 2017-02-06 | 2017-02-06 | A kind of distributed vibration positioning sensor system based on MZ interference and Φ OTDR |
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| CN201720111206.0U CN207180866U (en) | 2017-02-06 | 2017-02-06 | A kind of distributed vibration positioning sensor system based on MZ interference and Φ OTDR |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802722A (en) * | 2018-12-29 | 2019-05-24 | 武汉光谷互连科技有限公司 | A kind of optical cable generally investigates realization device synchronous with localization of fault |
| CN110345389A (en) * | 2019-06-13 | 2019-10-18 | 安徽陶博士环保科技有限公司 | A kind of pipe leakage and anti-excavation method for early warning and system |
| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN110912605A (en) * | 2019-11-11 | 2020-03-24 | 中国人民解放军海军工程大学 | Safety monitoring and early warning device and method for optical cable or photoelectric composite cable |
-
2017
- 2017-02-06 CN CN201720111206.0U patent/CN207180866U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802722A (en) * | 2018-12-29 | 2019-05-24 | 武汉光谷互连科技有限公司 | A kind of optical cable generally investigates realization device synchronous with localization of fault |
| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN110345389A (en) * | 2019-06-13 | 2019-10-18 | 安徽陶博士环保科技有限公司 | A kind of pipe leakage and anti-excavation method for early warning and system |
| CN110345389B (en) * | 2019-06-13 | 2021-02-12 | 安徽陶博士环保科技有限公司 | Pipeline leakage and excavation prevention early warning method and system |
| CN110912605A (en) * | 2019-11-11 | 2020-03-24 | 中国人民解放军海军工程大学 | Safety monitoring and early warning device and method for optical cable or photoelectric composite cable |
| CN110912605B (en) * | 2019-11-11 | 2022-01-25 | 中国人民解放军海军工程大学 | Safety monitoring and early warning device and method for optical cable or photoelectric composite cable |
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