CN106248247A - A kind of based on the brillouin distributed temperature of Raman, the sensing device of the double Parametric Detection of stress - Google Patents
A kind of based on the brillouin distributed temperature of Raman, the sensing device of the double Parametric Detection of stress Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 70
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 89
- 230000003287 optical effect Effects 0.000 claims abstract description 46
- 230000010287 polarization Effects 0.000 claims abstract description 40
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 239000004065 semiconductor Substances 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 31
- 238000001228 spectrum Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 16
- 238000005452 bending Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 230000009022 nonlinear effect Effects 0.000 description 3
- 229910052691 Erbium Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 235000012239 silicon dioxide Nutrition 0.000 description 1
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- 230000036413 temperature sense Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/322—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Brillouin scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Abstract
The invention discloses a kind of based on the brillouin distributed temperature of Raman, the sensing device of the double Parametric Detection of stress, including: laser instrument, first bonder, Polarization Controller, pulse generator, semiconductor optical amplifier, erbium-doped fiber amplifier, band filter, second bonder, optical attenuator, first annular device, 3rd bonder, multi-core fiber, second circulator, Raman wave filter, first photodetector, second photodetector, oscillograph, Polarization Controller, manipulator, microwave generator, polarization switch, 4th bonder, 3rd photodetector, electricity spectrometer and data processing module.Owing to using single mode multi-core fiber to constitute SDM system in the present invention, there is not the Mode Coupling of mode division multiplexing system and the unmatched problem of power of wavelength-division multiplex system, can reach accurately and obtain simultaneously the effect of temperature stress Radix Triplostegiae Grandiflorae amount.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly, to one based on Raman-brillouin distributed temperature
The sensing device of the double Parametric Detection of degree, stress.
Background technology
It is little that Fibre Optical Sensor has volume relative to traditional sensors, and bandwidth is highly sensitive, not by electromagnetic interference, resistance to
Corrosion, high temperature resistant, anti-high pressure, adapt to the advantages such as adverse circumstances.Exactly because these features, Fibre Optical Sensor is constantly subjected to various countries
Relevant academia and the great attention of research institution.From last century so far, the Fibre Optical Sensor of over one hundred kind is had now been developed.Mesh
It is front it has been proved that Fibre Optical Sensor is capable of strain, displacement, pressure, speed, acceleration, torque, angular velocity, temperature, electricity
The detection of more than the 70 kind of physical quantity such as stream, voltage, concentration, flow, flow velocity and magnetic, sound, light, ray.Its application penetrates into
The fields such as medical science and biology, workers and peasants' mining industry, energy environment protection, national defense and military, structure of intelligence.
Distributed optical fiber sensing system can be defined as: can be on whole continuous print fiber lengths, with the continuous letter of distance
The form of number senses out instrument or the system that measured parameter changes with fiber length.Distributed temperature, stress sensing system
System is typically optical fiber along temperature field, stress field arrangement, and that measures that light produces when transmitting in a fiber carries temperature, stress information
Scattered light, use OTDR (Optical Time Domain Reflectometer) technology simultaneously, it is possible to along optical fiber pass
Temperature, stress-space distribution and time dependent information on defeated path measure and monitor.
When light enters in optical fiber, photon and fiber medium interact and cause light to change direction i.e. scattering of light,
When the silicon dioxide molecules in photon with optical fiber interacts, it may occur that two kinds of situations, there is energy exchange and do not have energy to hand over
Change two kinds.When photon and fiber medium generation inelastic collision and there is energy exchange, this process is thus referred to as Brillouin
(Brillouin) scattering, Raman (Raman) scattering.
Distributed optical fiber temperature sensor based on Raman scattering is the product of external commercialization at first, and it possesses simultaneously
The most practical technology.Focus mostly at distribution type fiber-optic based on optical time domain Raman scattering reflectometer (ROTDR)
Temperature sensor, it is by optical fiber one short laser pulse of transmission, then recording the Raman light of backscattering, and this optical signal is just
Contain the loss along optical fiber and temperature distribution information.
Distributed sensor based on Brillouin scattering is most widely used, including Brillouin optical time-domain reflectometer/point
Analyzer (BOTDR/A) and Brillouin's domain of dependence reflectometer/analyser (BOCDR/A), etc..
BOTDR/A be time-domain information based on light pulse realize location, and to be measured can by measure brillouin frequency
In-migration is known.Brillouin scattering in optical fiber has frequency displacement, referred to as a Brillouin shift relative to pump light, following formula give
Go out:Wherein, νBBeing Brillouin shift, n is fiber core refractive index, νAFor the velocity of sound in optical fiber, λ
It it is the wavelength of pump light.When the variations in temperature of optical fiber local environment or when being stressed effect, Brillouin shift amount can be caused to send out
Changing, so just can know the temperature of this point and the variable quantity of stress by measuring the frequency shift amount of Brillouin scattering.This
Outward, for the situation of multi-core fiber, when bending, eccentric fibre core can be compressed or be stretched, and produces due to bending
Tangential direction on the components of stress Brillouin can be caused equally to offset change, show as the Brillouin shift of eccentric fibre core
To bending sensitivity.
BOCDR/A is again based on the distributed measurement that Brillouin scattering realizes, and difference is in BOCDR/A, pump
Pu light and detection light are all the continuous lights of same frequency modulation, and the difference on the frequency only working as pump light and detection light in a fiber is Brillouin
Just can produce stimulated Brillouin scattering during frequency displacement, brillouin gain relevant peaks occurs, by changing modulating frequency, thus it is possible to vary phase
The position of Guan Feng, is achieved in the location to space and information retrieval, reaches the purpose of distributed measurement.
In the past, most brillouin distributed sensor-based systems used common single-mode fiber, in recent years, also had people
Have studied brillouin distributed sensor-based system based on special optical fibers such as photonic crystal fiber, polarization maintaining optical fibre, less fundamental mode optical fibres.Due to
Brillouin sensing system, to temperature and stress cross sensitivity, is surveyed while traditional technical scheme temperature the most relatively difficult to achieve and stress
Amount.Although there are some solutions, the many reference amounts of such as based on less fundamental mode optical fibre mode division multiplexing Brillouin sensing technology are measured
With the multi-parameter measurement system of Raman-Brillouin sensing based on single-mode fiber wavelength-division multiplex technique, but the former has in real time
Poor, the shortcoming of Mode Coupling of property, the problem that the latter then exists system source power limited: on the one hand spontaneous Raman scattering light is non-
The most weak, it is therefore desirable to improve launched power, and on the other hand relatively low, simply due to the threshold value of stimulated Brillouin scattering in optical fiber
Improve launched power and can cause serious nonlinear effect, including stimulated Brillouin scattering and modulational instability etc..
Summary of the invention
For the defect of prior art, it is an object of the invention to provide a kind of based on Raman-brillouin distributed temperature,
The sensing device of the double Parametric Detection of stress, it is intended to solve Brillouin's system and cannot obtain temperature stress Radix Triplostegiae Grandiflorae amount simultaneously and precisely
Problem.
The invention provides a kind of based on Raman-brillouin distributed temperature, the sensing device of the double Parametric Detection of stress, bag
Include: laser instrument, the first bonder, Polarization Controller, pulse generator, semiconductor optical amplifier, erbium-doped fiber amplifier, band are logical
Wave filter, the second bonder, optical attenuator, first annular device, the 3rd bonder, multi-core fiber, the second circulator, Raman filter
Device, the first photodetector, the second photodetector, oscillograph, Polarization Controller, manipulator, microwave generator, polarization leave
Pass, the 4th bonder, the 3rd photodetector, electricity spectrometer and data processing module；The input of described first bonder
Connecting described laser instrument, the input of described Polarization Controller is connected to the first outfan of described first bonder, and described half
The light input end of conductor image intensifer is connected to the outfan of described Polarization Controller, the electricity input of described semiconductor optical amplifier
End connects described pulse generator；The input of described erbium-doped fiber amplifier is connected to the output of described semiconductor optical amplifier
End, the input of described band filter is connected to the outfan of described erbium-doped fiber amplifier, described second bonder defeated
Entering end and be connected to the outfan of described band filter, the first port of described second circulator is connected to described second bonder
The first outfan, the input of described Raman wave filter is connected to the 3rd port of described second circulator, described first light
The input of electric explorer and the input of described second photodetector are respectively connecting to two outputs of described Raman wave filter
End, the outfan of described first photodetector and the defeated place end of described second photodetector are all connected with described oscillograph；Institute
The input stating optical attenuator is connected to the second outfan of described second bonder, and the first port of described first annular device is even
Being connected to the outfan of described optical attenuator, the first input end of described 3rd bonder is connected to the second of described second circulator
Port, the second input of described 3rd bonder is connected to the second port of described first annular device；Described 3rd bonder
Outfan connect described multi-core fiber；The input of described Polarization Controller is connected to the second output of described first bonder
End, the optical signal input of described manipulator is connected to the outfan of described Polarization Controller, and the signal of telecommunication of described manipulator is defeated
Enter end and connect microwave generator；The input of described polarization switch is connected to the outfan of described manipulator, described 4th coupling
The first input end of device is connected to the 3rd port of described first annular device, and the second input of described 4th bonder is connected to
The outfan of described polarization switch, the input of described 3rd photodetector is connected to the outfan of described 4th bonder,
The input of described electricity spectrometer is connected to the outfan of described 3rd photodetector, the outfan of described electricity spectrometer
Connect described data processing module.
The present invention uses the system that Raman-Brillouin combines, and Raman system and Brillouin's system are respectively adopted many
The different fibre cores of core fibre, constitute SDM system.The technology used includes but are not limited to Raman time-domain reflectomer
(ROTDR)-Brillouin optical time-domain reflectometer/analyser (BOTDR/A) is relevant with Raman time-domain reflectomer (ROTDR)-Brillouin
Territory reflectometer/analyser (BOCDR/A) etc..
Further, during work, the light of laser instrument output is divided into first via light and the second road light through the first bonder；The
One road light produces detection after passing sequentially through Polarization Controller, semiconductor optical amplifier, erbium-doped fiber amplifier and band filter
Light；Described detection light is divided into the 3rd road light and the 4th road light after the second bonder；3rd road light is through the second circulator, fan-in
Enter the outer layer core of multi-core fiber after 3rd bonder, detect temperature for Raman diffused light；Raman rear orientation light is through the 3rd
Respectively the stokes light detected and anti-Stokes light are sent into the first photodetection through Raman wave filter after bonder
Device and the second photodetector by oscilloscope display；4th road light is successively through optical attenuator, first annular device, fan-in the 3rd coupling
Clutch enters the intermediate core of multi-core fiber, detects stress for Brillouin scattering；Second road light is successively through Polarization Controller, tune
Device processed, polarization switch enter the 4th bonder, enter the 3rd smooth electrical resistivity survey after effect relevant with intermediate core Brillouin's rear orientation light
Shown by electricity spectrometer after surveying device, finally carried out data acquisition and procession by data processing module.
Further, the splitting ratio of described first bonder, described second bonder and described 4th bonder is
50:50。
Further, described 3rd bonder is multicore bonder, and multiport inputs, and single port exports；Input is even
Order mode fiber, each input is independent of one another, without coupling；Output port connects multi-core fiber.
Further, the operation wavelength of described band filter is corresponding with light source, and the bandwidth of described band filter is little
In 1nm.
Further, described multi-core fiber is the optical fiber in same covering containing two or more fibre cores.
By the above technical scheme that the present invention is contemplated, compared with prior art, owing to using single mode multi-core fiber structure
Become SDM system, do not have that the power of the Mode Coupling of mode division multiplexing system and wavelength-division multiplex system is unmatched asks
Topic, can reach accurately and obtains simultaneously the effect of temperature stress Radix Triplostegiae Grandiflorae amount.
Accompanying drawing explanation
Fig. 1 is the structural representation of the multi-core fiber used that the embodiment of the present invention provides, and wherein (a) is viewgraph of cross-section,
B () is lateral plan；
Fig. 2 is the structural representation of the ROTDR-BOTDR system based on multi-core fiber that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
The present invention utilizes the outer layer core detection Raman scattering signal of multi-core fiber, and its (anti-Stokes light) is the quickest to temperature
Sense, utilizes intermediate core to detect brillouin scattering signal simultaneously, and its frequency displacement is the most sensitive with stress to temperature.Utilize this characteristic this
Bright achieve Raman based on multi-core fiber-brillouin distributed temperature, stress Radix Triplostegiae Grandiflorae amount senses simultaneously.This invention solves
Under conventional single mode fiber, wavelength-division multiplex system is for Brillouin's this problem different from incident optical power needed for Raman, utilizes multicore
Optical fiber forms SDM system, can real-time high-efficiency temperature stress Radix Triplostegiae Grandiflorae amount simultaneously and can be distinguished detection, it is contemplated that its
Association area will be widely used.
The present invention relates to a kind of Raman based on multi-core fiber-brillouin distributed temperature, strain gauge.In optical fiber
Brillouin shift is to temperature, stress sensitive and the most linear.And in multi-core fiber, the brillouin frequency of eccentric fibre core
Moving also to bending sensitivity, but intermediate core is owing to being on the geometry neutral axis of optical fiber, it is to bend-insensitive；On the other hand, light
Spontaneous Raman scattering in fibre is the most temperature sensitive, and counter stress and bending are the most insensitive.Therefore, at the different fibre cores of multi-core fiber
In can build Raman and brillouin distributed sensor-based system respectively, specially intermediate core implements brillouin distributed sensing, obtains
Distributed temperature, stress information；Eccentric fibre core implements Raman distributed sensing, obtains distributed temperature information.Due to many
Temperature suffered by the fibre core spatial distribution structure that core fibre is uniform, compact, intermediate core and eccentric core is the same, hence with this
The Raman of space division multiplexing-brillouin distributed sensor-based system can realize temperature, stress Radix Triplostegiae Grandiflorae amount simultaneously and can discriminating measurement；And
And system is to bend-insensitive, efficiently solve simple in multi-core fiber employing existing for brillouin distributed sensor-based system
The difficult problem that temperature, stress, bending all sensitivities be cannot be distinguished by.The invention belongs to technical field of optical fiber sensing.
Brillouin shift is to temperature and stress cross sensitivity, because temperature and STRESS VARIATION all can cause optical fiber to reflect
Rate and the change of phonon speed, from the formula (1) of Brillouin shift, Brillouin shift also will become the most accordingly
Changing, this is Brillouin's thermometric and the principle surveying strain, and in this external multi-core fiber, eccentric fibre core is also to bending sensitivity.For simultaneously
Demodulate temperature, two parameters of stress, introduce the most thermally sensitive Raman scattering.And in order to avoid the shadow bent
Ring, measure it is proposed that implement distributed Brillouin in intermediate core, in eccentric fibre core, implement distributed Raman measure.
Relevant scholar utilizes wavelength-division multiplex system, and from single-mode fiber, subrane extracts Raman and Brillouin signal.But
Raman scattering intensities is the most weak, so system needs the highest incident optical power；And on the other hand owing to optical fiber being excited background of cloth
The threshold value of deep pool scattering is relatively low, and raising launched power simply can cause serious nonlinear effect, including stimulated Brillouin scattering
With modulational instability etc..
The present invention has proposed with experimental verification to implement Raman-brillouin distributed sensing technology in multi-core fiber, makes
On the basis of a light source, the Raman scattering intensities of its outer layer core is utilized to carry out temperature detection, the Brillouin shift of intermediate core
Carry out temperature, stress mornitoring, it is achieved based on the Raman containing multi-core fiber-brillouin distributed sensor.This system can be efficient
In real time to while temperature, stress Radix Triplostegiae Grandiflorae amount and can discriminating measurement, needed for effectively solving Brillouin and Raman, incident optical power is not
Same problem.
The present invention proposes based on the Raman containing multi-core fiber-brillouin distributed sensor, and the technology used includes
But it is not limited only to Raman time-domain reflectomer (ROTDR)-Brillouin optical time-domain reflectometer/analyser (BOTDR/A) and Raman time domain
Reflectometer (ROTDR)-Brillouin's domain of dependence reflectometer/analyser (BOCDR/A) etc..
Fig. 1 show used by embodiment be a kind of centrosymmetry distribution seven core fibres.It is to be noted the present invention
Required rights protection scope also includes the multi-core fiber structure containing eccentric fibre core of other core structure of any employing, quantity
The Raman made-brillouin distributed temperature, stress sensing technology.
Fig. 2 gives a kind of based on multi-core fiber the ROTDR-BOTDR system construction drawing that embodiment is used.Embodiment
In only used 2 cores (passage) in multi-core fiber: 1 intermediate core and 1 outer layer core.Intermediate core is examined based on Brillouin shift
Surveying stress and temperature, outer layer core detects temperature based on Raman scattering intensities.Owing to Brillouin shift is to intersect temperature with stress
Sensitive, and Raman scattering intensities is the most temperature sensitive.Responded by outer layer core Raman thermometric, demodulate temperature value, make simultaneously
For the temperature-compensating in Brillouin shift measurement result, stress can be demodulated.
It should be noted that the usage quantity of fibre core in change multi-core fiber, sequentially, direction, or use drawing of other
Graceful-Brillouin sensing technology, such as ROTDR-BOTDR, ROTDR-BOCDR, ROTDR-BOCDA etc. are also in the right of application claims
In protection domain, all of system construction drawing is not drawn at this.
Fig. 2 shows that the one that the embodiment of the present invention provides is examined based on Raman-brillouin distributed temperature, stress Radix Triplostegiae Grandiflorae amount
The structure of the sensing device surveyed, for convenience of description, illustrate only the part relevant to the embodiment of the present invention, and details are as follows:
Sensing device includes: laser instrument the 1, first bonder 2, Polarization Controller 3, the pulse generator 4 of narrow linewidth, partly lead
Body image intensifer 5, erbium-doped fiber amplifier 6, band filter the 7, second bonder 8, optical attenuator 9, first annular device 10,
Three bonders 11, multi-core fiber the 12, second circulator 13, the 14, first photodetector the 15, second photodetection of Raman wave filter
Device 16, oscillograph 17, Polarization Controller 18, manipulator 19, microwave generator 20, polarization switch the 21, the 4th bonder the 22, the 3rd
Photodetector 23, electricity spectrometer 24 and data processing module 25；The delivery outlet of laser instrument 1 connects bonder 2, bonder 2
Delivery outlet be divided into two-way, a road connects semiconductor optical amplifier 5 light input end, the wherein outfan of impulser 4 and half
The electrical input of conductor image intensifer 5 is connected.The light input end phase of the light output end of semiconductor amplifier and erbium-based amplifier 6
Even, the light output end of erbium-based amplifier 6 is connected with the light input end of band filter 7, the transmission light output end of band filter 7
Connecting the input of bonder 8, the outfan of bonder 8 is divided into two-way, and a road is connected with optical attenuator 9, the outfan of 9 and the
1 port of one circulator 10 is connected, and 2 ports of first annular device 10 and the input port of the 3rd bonder 11 are connected, circulator
3 ports and the 4th bonder 22 two-way input one tunnel connect；Multi-core fiber 12 and the 3rd bonder 11 use welding
Mode links together；Another outfan of second bonder 8 is connected with the input of Raman wave filter 14, Raman wave filter 14
Two-way outfan connect the first photodetector 15 and the second photodetector 16 respectively, the outfan of two detectors is respectively
It is linked in oscillograph 17.
The light of the outfan connection manipulator 19 that another outfan of the first bonder 2 connects Polarization Controller 18,18 is defeated
Entering end, microwave generator 20 outfan connects the electrical input of manipulator 19, and the light output end of manipulator 19 and polarization open the light 21
Input connect.One tunnel of the outfan of polarization switch 21 and the two-way input of the 4th bonder 22 is attached, coupling
The two-way outfan of device 22 only selects a road to be connected with photodetector 23, the electric delivery outlet of photodetector 23 and electricity spectrometer 24
Connect, be finally connected with data collecting system 25.
The Distributed Feedback Laser that the laser instrument of narrow linewidth is the most common；The splitting ratio of bonder is all 50:50；Bandpass filtering
Device operation wavelength is corresponding with light source, below bandwidth 1nm.
In same covering, the optical fiber containing two or more fibre cores all can be classified as multi-core fiber.
The light of laser instrument 1 output of narrow linewidth is divided into two-way through the first bonder 2: a road passes sequentially through Polarization Control above
Device 3, semiconductor optical amplifier 5 and controlled by pulse generator 4, erbium-doped fiber amplifier 6, band filter 7 etc., be used for producing
Detection light；Again light beam is divided into two-way through the second bonder 8, above road second circulator 13, fan-in the 3rd bonder
The 11 outer layer cores entering multi-core fiber 12, detect temperature for Raman diffused light.Raman rear orientation light is through the 3rd bonder 11
After through Raman wave filter 14 respectively the stokes light detected and anti-Stokes light are sent into the first photodetector 15,
16 and shown by oscillograph 17.Below after the second bonder 8, a road light is successively through optical attenuator 9, first annular device 10, fan
Enter the 3rd bonder 11 and enter the intermediate core of multi-core fiber 12, detect stress for Brillouin scattering.Light source 1 is through the first coupling
After device 2, a road light enters through Polarization Controller 18, manipulator 19 (being controlled by microwave generator 20), polarization switch 21 successively below
4th bonder 22, by electricity spectrum is divided after entering the 3rd photodetector 23 after effect relevant with intermediate core Brillouin's rear orientation light
Analyzer 24 shows, is finally carried out data acquisition and procession by data processing module 25.
The Raman scattering temperature-measurement principle of outer layer core: anti-Stokes Raman scattered light is strong with Stokes Raman scattered light
Degree ratio I (T), shown in following formula:Wherein, φa, φsIt it is anti-Stokes
The intensity of Raman diffused light and Stokes Raman scattered light level value after opto-electronic conversion；νa, νsIt is anti-stoke respectively
This Raman scattering photon and the frequency of Stokes Raman scattered photon；H is Bo Langke (Planck) constant, △ νrIt is that optical fiber divides
Phonon frequency (the △ ν of sonr=13.2THz), K is Boltzmann constant, and T is Kelvin (Kelvin) absolute temperature.By both
Strength ratio, obtain the temperature information of each section of optical fiber.
The Brillouin shift detection stress principle of intermediate core is given by:
△νB=Cνε·△ε+CνT·△T……(3)；Wherein △ νBFor the variable quantity of Brillouin shift, Cνε, CνTFor cloth
In the deep pool coefficient of strain of frequency displacement and temperature coefficient.By measuring frequency displacement and the Raman scattering institute of optical fiber Brillouin line dorsad
The temperature value detected obtains the STRESS VARIATION amount of on optical fiber each section.
It is important to note that this system may have a lot of mutation, it is impossible to enumerate one by one in this specification, as long as being
Use the Raman-brillouin distributed temperature of multi-core fiber realization containing eccentric fibre core, stress sensing scheme all in the present invention
In the protection domain required, it is meant that the size of the optical fiber used, shape, fibre core quantity, the eccentric position of fibre core, space are multiple
Light path system, sequentially, direction, Raman used-brillouin distributed sensing technology (include but not only limit ROTDR-
BOTDR/A, ROTDR-BOCDR/A etc.) etc. when having different from the present embodiment, also in scope of the present invention.More
Further, " Raman used-brillouin distributed sensing technology " includes various real based on Raman in optical fiber-Brillouin scattering
Existing sensing technology, does not jumps out scope of the present invention with the difference of the implementation of concrete system.The most not
Saying by system being done some changes, using or less use some instrument as more, or using another kind of different from embodiment
Raman-Brillouin sensing technology reach to jump out the purpose of scope of the present invention.
Brillouin shift is to temperature, stress cross sensitivity, and what usual detector was detected is temperature and Stress superposition
Frequency shift amount.For obtaining temperature, stress simultaneously, introduce Raman scattering and carry out temperature detection, and Brillouin shift only need to demodulate
Stress value.
Traditional Raman-brillouin distributed sensor-based system, on the basis of being built upon single-mode fiber, passes through wavelength-division multiplex
System, leaches Raman diffused light and Brillouin scattering respectively.But there is the problem that light source power is limited in this type of system: on the one hand
Spontaneous Raman scattering light is the most weak, it is therefore desirable to improve launched power, and on the other hand due to stimulated Brillouin scattering in optical fiber
Threshold value relatively low, simply improve launched power can cause serious nonlinear effect, including stimulated Brillouin scattering and modulation
Unstability etc..
The present invention proposes also experimental verification based on the Raman containing multi-core fiber-brillouin distributed sensor-based system
In (include but not only limit ROTDR-BOTDR/A, ROTDR-BOCDR/A etc.), in conjunction with SDM system, utilize outside multi-core fiber
The Raman scattering of layer core is to temperature detection, the Brillouin shift counter stress detection of intermediate core, it is achieved distributed temperature, stress Radix Triplostegiae Grandiflorae
Amount ga s safety degree detection simultaneously.
Technical scheme proposed by the invention will find huge application prospect in actual commercial Application.Firstly the need of
Special instruction, there is a lot of mutation in technical scheme, it is impossible to lists one by one, as long as using containing eccentric fibre core many
Core fibre, (includes but are not limited to ROTDR-BOTDR/A, ROTDR-based on various Ramans-brillouin distributed sensing technology
BOCDR/A) distributed temperature that realizes, stress measurement are all in protection domain of the presently claimed invention.
The detailed description of the invention of the present invention is as follows:
(1) as required, reasonably select suitable sensing technology, including but not only limit ROTDR-BOTDR/A, ROTDR-
BOCDR/A etc., build the system of correspondence according to the technology used.Embodiment uses ROTDR-BOTDR.Embodiment uses
Be seven core fibres containing 6 eccentric fibre cores.
(2) embodiment system as shown in Figure 2 is built.The light of laser instrument 1 output of narrow linewidth is divided into through the first bonder 2
Two-way: above a road pass sequentially through Polarization Controller 3, semiconductor optical amplifier 5 and controlled by pulse generator 4, Er-doped fiber
Amplifier 6, band filter 7 etc., be used for producing detection light；Again light beam is divided into two-way through the second bonder 8, above a road
Enter the outer layer core of multi-core optical 12 through the second circulator 13, fan-in the 3rd bonder 11, detect temperature for Raman diffused light.Draw
The stokes light detected is held in the palm with anti-this respectively after the 3rd bonder 11 by graceful rear orientation light through Raman wave filter 14
Ke Si light is sent into the first photodetector 15,16 and is shown by oscillograph 17.Below after the second bonder 8, a road light is successively
The intermediate core of multi-core optical 12 is entered, for Brillouin scattering through optical attenuator 9, first annular device 10, fan-in the 3rd bonder 11
Light detection stress.Wherein optical attenuator 9 can be by optical power adjustment in spontaneous radiation Brillouin threshold.Light source 1 is through the first coupling
After device 2, a road light enters the 4th bonder 22 through Polarization Controller 18, manipulator 19, polarization switch 21, successively with centre below
Shown, finally by counting by electricity spectrometer 24 after entering the 3rd photodetector 23 after the relevant effect of core Brillouin's rear orientation light
Data acquisition and procession is carried out according to processing module 25.
(3) coefficient of strain C of Brillouin shift in calibration formula (3)νεWith temperature coefficient CνT.C due to different optical fiberνε,
CνTMay be different, so needing before Experimental Research to demarcate.On the premise of stress is constant, changes temperature, detect corresponding cloth
In deep pool frequency shift amount carry out linear fit and can obtain the temperature coefficient C in formula (3)νT；In like manner, on the premise of temperature-resistant,
Change stress, detect corresponding Brillouin shift amount and carry out linear fit and can obtain the stress coefficient C in formula (3)νε。
(4) demodulation temperature variation.In temperature T0, according to the first photodetector 15 and the second photodetector 16 during T
Detect that magnitude of voltage obtains the I (T of correspondence0), I (T).By I (T0), I (T) substitute into formula (2) and do ratio proccessing be such as following formula institute
Show:And then temperature variation △ T can be tried to achieve.
(5) demodulation STRESS VARIATION amount.According to formula (3) and electricity spectrometer 24 gained frequency displacement variable quantity, variations in temperature
Amount is obtained, the most so system stress variable quantity can be obtained.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, not in order to
Limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, all should comprise
Within protection scope of the present invention.
Claims (6)
1. one kind based on Raman-brillouin distributed temperature, the sensing device of the double Parametric Detection of stress, it is characterised in that including:
Laser instrument (1), the first bonder (2), Polarization Controller (3), pulse generator (4), semiconductor optical amplifier (5), er-doped light
Fiber amplifier (6), band filter (7), the second bonder (8), optical attenuator (9), first annular device (10), the 3rd bonder
(11), multi-core fiber (12), the second circulator (13), Raman wave filter (14), the first photodetector (15), the second smooth electrical resistivity survey
Survey device (16), oscillograph (17), Polarization Controller (18), manipulator (19), microwave generator (20), polarization switch (21), the
Four bonders (22), the 3rd photodetector (23), electricity spectrometer (24) and data processing module (25)；
The input of described first bonder (2) connects described laser instrument (1), and the input of described Polarization Controller (3) connects
To the first outfan of described first bonder (2),
The light input end of described semiconductor optical amplifier (5) is connected to the outfan of described Polarization Controller (3), described quasiconductor
The electrical input of image intensifer (5) connects described pulse generator (4)；
The input of described erbium-doped fiber amplifier (6) is connected to the outfan of described semiconductor optical amplifier (5), and described band leads to
The input of wave filter (7) is connected to the outfan of described erbium-doped fiber amplifier (6), the input of described second bonder (8)
End is connected to the outfan of described band filter (7),
First port of described second circulator (13) is connected to the first outfan of described second bonder (8), described Raman
The input of wave filter (14) is connected to the 3rd port of described second circulator (13), described first photodetector (15)
The input of input and described second photodetector (16) is respectively connecting to two outfans of described Raman wave filter (14),
The outfan of described first photodetector (15) and the outfan of described second photodetector (16) are all connected with described oscillography
Device (17)；
The input of described optical attenuator (9) is connected to the second outfan of described second bonder (8), described first annular device
(10) the first port is connected to the outfan of described optical attenuator (9), and the first input end of described 3rd bonder (11) is even
Being connected to the second port of described second circulator (13), the second input of described 3rd bonder (11) is connected to described first
Second port of circulator (10)；The outfan of described 3rd bonder (11) connects described multi-core fiber (12)；
The input of described Polarization Controller (18) is connected to the second outfan of described first bonder (2), described manipulator
(19) optical signal input is connected to the outfan of described Polarization Controller (18), the signal of telecommunication input of described manipulator (19)
End connects microwave generator (20)；The input of described polarization switch (21) is connected to the outfan of described manipulator (19),
The first input end of described 4th bonder (22) is connected to the 3rd port of described first annular device (10), and the described 4th
Second input of bonder (22) is connected to the outfan of described polarization switch (21),
The input of described 3rd photodetector (23) is connected to the outfan of described 4th bonder (22), described electricity spectrum point
The input of analyzer (24) is connected to the outfan of described 3rd photodetector (23), the output of described electricity spectrometer (24)
End connects described data processing module (25).
2. sensing device as claimed in claim 1, it is characterised in that during work, the light that laser instrument (1) exports is through the first coupling
Device (2) is divided into first via light and the second road light；
First via light passes sequentially through the logical filter of Polarization Controller (3), semiconductor optical amplifier (5), erbium-doped fiber amplifier (6) and band
Ripple device (7) produces detection light afterwards；Described detection light is divided into the 3rd road light and the 4th road light after the second bonder (8)；
3rd road light enters the outer layer core of multi-core fiber (12) after the second circulator (13), fan-in the 3rd bonder (11), uses
Temperature is detected in Raman diffused light；Raman rear orientation light respectively will through Raman wave filter (14) after the 3rd bonder (11)
The stokes light detected and anti-Stokes light send into the first photodetector (15) and the second photodetector (16) and
Shown by oscillograph (17)；
4th road light enters multi-core fiber through optical attenuator (9), first annular device (10), fan-in the 3rd bonder (11) successively
(12) intermediate core, detects stress for Brillouin scattering；
Second road light enters the 4th bonder (22) through Polarization Controller (18), manipulator (19), polarization switch (21) successively, with
Shown by electricity spectrometer (24) after entering the 3rd photodetector (23) after the relevant effect of intermediate core Brillouin's rear orientation light,
Finally carried out data acquisition and procession by data processing module (25).
3. sensing device as claimed in claim 1 or 2, it is characterised in that described first bonder (2), described second coupling
The splitting ratio of device (8) and described 4th bonder (22) is 50:50.
4. sensing device as claimed in claim 1 or 2, it is characterised in that described 3rd bonder (11) is multicore bonder,
Multiport inputs, and single port exports；Input connects single-mode fiber, and each input is independent of one another, without coupling；Output port connects
Multi-core fiber.
5. sensing device as claimed in claim 1 or 2, it is characterised in that the operation wavelength of described band filter (7) and light
Source is corresponding, and the bandwidth of described band filter (7) is less than 1nm.
6. sensing device as claimed in claim 1 or 2, it is characterised in that described multi-core fiber (12) is in same covering
Optical fiber containing two or more fibre cores.
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