CN108534910A - A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber - Google Patents
A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber Download PDFInfo
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- CN108534910A CN108534910A CN201810224048.9A CN201810224048A CN108534910A CN 108534910 A CN108534910 A CN 108534910A CN 201810224048 A CN201810224048 A CN 201810224048A CN 108534910 A CN108534910 A CN 108534910A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
The distributed dual sampling method based on Asymmetric Twin-Core Fiber that the invention discloses a kind of.The present invention includes pulse laser, Asymmetric Twin-Core Fiber, and wherein Asymmetric Twin-Core Fiber a fibre core is multimode fibre fibre core, another fibre core is single mode optical fiber fibre core；Single mode narrow linewidth laser；Electrooptic modulator and data processing centre.The present invention using the multimode fibre core in Asymmetric Twin-Core Fiber be suitble to backward Raman scattering light propagation and fiber core with single-mold be suitble to after is propagated to Rayleigh scattering the characteristics of, realize the sensing of distributed temperature and vibration pair parameters, have the characteristics that operability simple in structure is strong.
Description
Technical field
The invention belongs to sensory field of optic fibre, one kind is related to based on Asymmetric Twin-Core Fiber to realize that temperature and vibration are double
The distribution type sensing method of parameter.
Background technology
Distributed Optical Fiber Sensing Techniques are since it is with electromagnetism interference, corrosion-resistant, high temperature resistant, wide range of measurement and complete
Light has been widely used in the fields such as commercial measurement and production without the features such as electricity, wherein for double parameters of temperature and vibration
Sensing is that researcher extremely pays close attention in recent years, especially in some important occasions, such as building railway, national defense industry
And petroleum pipeline etc..
The Distributed Optical Fiber Sensing Techniques of comparative maturity include mainly at present：1, the distribution type fiber-optic based on interferometer principle
Sensing technology (such as Mach-Zehnder), the reference arm of this sensor are easy to be made it with performance by extraneous interference
It is unstable, the shortcomings of orientation distance is short.2, traditional distributed fiber Raman sensor, this sensor are using light in optical fiber
The Raman scattering signal generated when middle transmission it is temperature sensitive and realize, the disadvantage is that cannot apply and vibration in terms of.Based on non-
The distributed dual sampling device of symmetrical twin-core fiber is in addition to distributed fiberoptic sensor and tradition based on interferometer principle
Distributed optical fiber Raman temperature sensor other than another distributed fiberoptic sensor.This sensor not only can be same
The on-line measurement of Shi Shixian temperature and vibration can also avoid the cross influence of temperature and vibration.Therefore, a kind of structure letter is invented
List measuring temperature and the method for sensing of vibration can be of great significance simultaneously.
Invention content
In view of the deficiencies of the prior art, the present invention proposes a kind of distributed dual sampling side based on twin-core fiber
Method.
The method of the present invention includes following steps：
Step (1) selects an output wavelength for the pulse laser of 1550nm；One four port wavelength division multiplexer；One
The bundling device of three ports, the Asymmetric Twin-Core Fiber that a segment length is L, wherein Asymmetric Twin-Core Fiber a fibre core are multimode
Fiber core, another fibre core are single mode optical fiber fibre core；Three PD probes；The single mode narrow linewidth that one wavelength is 1550nm swashs
Light device；One electrooptic modulator；One erbium-doped fiber amplifier；One optical circulator；One data processing centre.
Step (2) connects the first port of the output port for the pulse laser that wavelength is 1550nm and wavelength division multiplexer
It connects；The first port of 4th port of wavelength division multiplexer and bundling device is connected；It is L's by the second port of bundling device and length
Asymmetric Twin-Core Fiber connects；By wavelength be 1550nm single mode narrow linewidth laser output port and electrooptic modulator it is defeated
Inbound port connects, and wavelength is modulated into pulse laser for the continuous laser of 1550nm with this；By the output port of electrooptic modulator
It is connect with the input port of erbium-doped fiber amplifier；The output port of erbium-doped fiber amplifier and the first port of optical circulator connect
It connects；The second port of optical circulator and the third port of bundling device connect；The third port of circulator, the second of wavelength division multiplexer
Port and third port are connected with three PD probes respectively；Three PD probes are connect with data processing centre.
Step (3) open wavelength be 1550nm light-pulse generator, pulse laser by after wavelength division multiplexer first port from
The 4th port of wavelength division multiplexer exports, and pulse laser enters Asymmetric Twin-Core Fiber multimode fibre by bundling device first port
Core.Laser pulse, which is incident on after multimode fibre core to interact with optical fiber in the air, occurs nonlinear interaction, generates two backward
Scattering light, i.e. Raman Stokes ratio and Raman anti-Stokes scattering light.Two rear orientation lights pass through bundling device
It is exported from bundling device first port then into the 4th port of wavelength division multiplexer after second port, medium wavelength range is 1440
The Raman anti-Stokes scattering light and wavelength of~1460nm is respectively connected in 1640~1660 Raman Stokes ratio
Enter data processing centre after PD probes, processing analysis is carried out to collected data with data processing centre.
At the same time the single mode narrow linewidth laser that wavelength is 1550nm is opened, narrow-linewidth laser is modulated through electrooptic modulator
For periodically pulsing laser.Pulse laser is by entering circulator first port after erbium-doped fiber amplifier, then from ring
The output of row device second port enters bundling device third port, and the pulse laser being amplified is exported from bundling device second port to be entered
To the fiber core with single-mold of asymmetric fiber loop, pulse laser generates the Rayleigh scattering light of back scattering during fiber core with single-mold is propagated
Signal.The Rayleigh scattering light of back scattering after bundling device third port by returning to circulator second port, then again from belt
The output of device third port enters PD probes, then enters data processing with together with the signal light of residue two PD probes simultaneously
Center carries out signal mathematics, realizes temperature and vibration dual sampling.
Using the time of unbalanced pulse laser and narrow linewidth laser as time zero, then at some fixed point after to Raman
The time that Stokes ratio, backward Raman anti-Stokes scattering light and backward Rayleigh scattering light return to bundling device is t.
For backward Raman scattering light, the strong and weak temperature modulation by fibre scattering point of Raman diffused light, that is, transmit into
When the Stokes ratio and anti-Stokes scattering luminous intensity of data processing centre are the function, i.e. t of time t and temperature T
Carve first PD probe, the Raman stokes light that second PD probe receives and Raman anti-Stokes luminous power difference
For：
Ps=fs(t,T) (1)
With
Pas=fas(t,T) (2)
Wherein T is the temperature at t moment Asymmetric Twin-Core Fiber fixed point.It is dissipated with Stokes ratio and anti-Stokes
It penetrates the ratio of luminous power and obtains the distribution of space temperature field to solve temperature regulating, i.e.,：
Ps/Pas=fs(t,T)/fas(t,T) (3)
For backward Rayleigh scattering light, the vibration of external environment can cause backward Rayleigh scattering light in Asymmetric Twin-Core Fiber
The variation of phase, i.e., when extraneous oscillation intensity is ν after to the function that Rayleigh scattering light phase is time t and ν：
φ=f (t, ν) (4)
I.e.
ν=f-1(t,φ) (5)
Time t, the power of two backward Raman scattering light and backward Rayleigh scattering light are collected with data processing centre
Phase information can specifically obtain the position of measurement point, temperature and vibration information.
The present invention is mainly suitable for the distributed temperatures of long range and vibration dual sampling, utilize Asymmetric Twin-Core Fiber
In multimode fibre core be suitble to backward Raman scattering light propagation and fiber core with single-mold the characteristics of being propagated to Rayleigh scattering after being suitble to, realization
The sensing of distributed temperature and the double parameters of vibration, has the characteristics that operability simple in structure is strong.
Description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the structure chart of Asymmetric Twin-Core Fiber；
Fig. 3 is the sectional view of Asymmetric Twin-Core Fiber.
Specific implementation mode
Below in conjunction with attached drawing, the invention will be further described.
Step (1) selects an output wavelength for the pulse laser 1 of 1550nm；One four port wavelength division multiplexer
(WDM)2；The bundling device 3 of one three port, the Asymmetric Twin-Core Fiber 4 that a segment length is 20km, wherein Asymmetric Twin-Core Fiber
A fibre core be multimode fibre, core diameter be 62.5 μm, another fibre core be single mode optical fiber, core diameter be 8 μm；One
A wavelength is the single mode narrow linewidth laser 5 of 1550nm；One electrooptic modulator 6；One erbium-doped fiber amplifier (EDFA) 7；
One optical circulator 8；Three PD probes are respectively 9,10,11；One data processing centre 12, sees Fig. 1.
Wavelength is 1 fiber port of the output port and wavelength division multiplexer 2 of the pulse laser 1 of 1550nm by step (2)
Connection；4 fiber ports of wavelength division multiplexer 2 are connect with 1 fiber port of bundling device 3, by 2 fiber ports of bundling device 3 with
The Asymmetric Twin-Core Fiber 4 that length is 20km connects；By wavelength be 1550nm single mode narrow linewidth laser 5 output port with
The input port of electrooptic modulator 6 connects, and wavelength is modulated into pulse laser for the continuous laser of 1550nm with this；By electric light tune
The output port of device 6 processed is connect with the input port of erbium-doped fiber amplifier (EDFA) 7, and function is to amplify the work(of pulse laser
The intensity of rear orientation light is to increase the survey of sensor in fiber core with single-mold of the rate to improve rear end Asymmetric Twin-Core Fiber
Measure length；The output port of erbium-doped fiber amplifier 7 is connect with 1 fiber port of optical circulator 8；2 ports of optical circulator 8 with
3 fiber ports of bundling device 3 connect；The port 3 of circulator 8, the port 2 of wavelength division multiplexer 2 and 3 respectively with 3 PD probe 9,
10,11 connection；3 PD probes 9,10,11 are connect with data processing centre 12.
Step (3) opens the light-pulse generator 1 that wavelength is 1550nm, behind the port 1 that pulse laser passes through wavelength division multiplexer 2 from
The port 4 of wavelength division multiplexer 2 exports, and pulse laser enters the Asymmetric Twin-Core Fiber 4 of 20km by the port 1 of bundling device 3
Multimode fibre core 4-1.Laser pulse, which is incident on after multimode fibre core 4-1 to interact with optical fiber in the air, occurs non-linear work
With two backward scattering light of generation, i.e. Raman Stokes ratio and Raman anti-Stokes scattering light.Raman diffused light
Strength versus temperature it is very sensitive, so as to realize temperature sensing.And Stokes ratio and this anti-support in Raman scattering
Ke Si scattering light is all very faint, so ripe technology all must just can guarantee realization long distance using multimode fibre 4-1 at present
From sensing, Fig. 2 and Fig. 3 are seen.Behind the port 2 that two rear orientation lights pass through bundling device 3 then from the output of the port of bundling device 31
The port 4 of wavelength division multiplexer 2 is entered, the anti-Stokes scattering light and wavelength that medium wavelength range is 1450nm are 1650nm
Stokes ratio be respectively connected to PD probe 10 and 11 after enter Data Acquisition Card 12, with Data Acquisition Card 12 to collecting
Data carry out processing analysis.
At the same time the single mode narrow linewidth laser 5 that wavelength is 1550nm is opened, narrow-linewidth laser is adjusted through electrooptic modulator 6
It is made as periodically pulsing laser.Pulse laser is by the port 1 into circulator 8 after erbium-doped fiber amplifier 7, then from ring
The port 2 of row device 8 exports the port 3 for entering bundling device 3, and from bundling device port 2, output enters the pulse laser being amplified
The fiber core with single-mold 4-2 of asymmetric fiber loop 4, pulse laser generate the Rayleigh scattering light of back scattering during fibre core 2 is propagated
The phase of signal, Rayleigh scattering light understands because of extraneous vibration counter changing, and vibration side may be implemented using Rayleigh scattering
The sensing in face.Because Rayleigh scattering light is higher than the intensity of Raman diffused light, can be realized far using fiber core with single-mold 4-2
Distance-sensing is shown in Fig. 2 and Fig. 3.The port 2 of circulator 8 is returned to behind the port 3 that backward Rayleigh scattering light passes through bundling device 3 then
From the port of circulator 83, output enters PD probes 9 again, together with the signal light for 10 and PD probes 11 of then popping one's head in simultaneously with PD
It enters digital collection center 12 and carries out signal mathematics, realize temperature and vibration dual sampling.
Using the time of unbalanced pulse laser and narrow linewidth laser as time zero, arrived according to digital collection central data
Time t and digital collection central data arrive PD probe 9, PD pop one's head in 10 and PD probe 11 phase ν, power PsAnd PasAnd
Formula 3 and 5 can be obtained by the temperature and oscillation intensity of measurement point.
The present invention mainly applies twin-core fiber developed in recent years, by by pulse laser be injected into one it is non-right
Claim twin-core fiber that can be formed simultaneously the method for backward Raman scattering and backward Rayleigh scattering to realize distributed temperature and shake
Dynamic dual sampling, thus the advantages of there is structure letter, dual sampling may be implemented.
Claims (1)
1. a kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber, it is characterised in that this method is specifically：
Step (1) selects an output wavelength for the pulse laser of 1550nm；One four port wavelength division multiplexer；One three end
The bundling device of mouth, the Asymmetric Twin-Core Fiber that a segment length is L, wherein Asymmetric Twin-Core Fiber a fibre core are multimode fibre
Fibre core, another fibre core are single mode optical fiber fibre core；Three PD probes；The single mode narrow linewidth laser that one wavelength is 1550nm
Device；One electrooptic modulator；One erbium-doped fiber amplifier；One optical circulator；One data processing centre；
Step (2) connects the first port of the output port for the pulse laser that wavelength is 1550nm and wavelength division multiplexer；It will
4th port of wavelength division multiplexer and the first port of bundling device connect；It is the non-right of L by the second port of bundling device and length
Claim twin-core fiber connection；By the input terminal of the output port and electrooptic modulator of the single mode narrow linewidth laser that wavelength is 1550nm
Mouth connection, pulse laser is modulated into this by wavelength for the continuous laser of 1550nm；By the output port of electrooptic modulator with mix
The input port of doped fiber amplifier connects；The output port of erbium-doped fiber amplifier and the first port of optical circulator connect；
The second port of optical circulator and the third port of bundling device connect；The third port of circulator, the second end of wavelength division multiplexer
Mouth and third port are connected with three PD probes respectively；Three PD probes are connect with data processing centre；
Step (3) open wavelength be 1550nm light-pulse generator, pulse laser by after wavelength division multiplexer first port from wavelength-division
The 4th port of multiplexer exports, and pulse laser enters Asymmetric Twin-Core Fiber multimode fibre core by bundling device first port；Swash
It interacts in the air with optical fiber after optical pulse strikes to multimode fibre core and nonlinear interaction occurs, generate two backward scatterings
Light, i.e. Raman Stokes ratio and Raman anti-Stokes scattering light；Two rear orientation lights pass through bundling device second end
From the output of bundling device first port then into the 4th port of wavelength division multiplexer after mouthful, medium wavelength range 1440~
The Raman anti-Stokes scattering light and wavelength of 1460nm is respectively connected to PD in 1640~1660 Raman Stokes ratio
Enter data processing centre after probe, processing analysis is carried out to collected data with data processing centre；
At the same time the single mode narrow linewidth laser that wavelength is 1550nm is opened, narrow-linewidth laser is modulated to week through electrooptic modulator
The pulse laser of phase property；Pulse laser is by entering circulator first port after erbium-doped fiber amplifier, then from circulator
Second port output enters bundling device third port, and the pulse laser being amplified enters non-from the output of bundling device second port
The fiber core with single-mold of symmetric fiber, pulse laser generate the Rayleigh scattering light letter of back scattering during fiber core with single-mold is propagated
Number；The Rayleigh scattering light of back scattering after bundling device third port by returning to circulator second port, then again from circulator
Third port output enters PD probes, then enters Data processing with together with the signal light of residue two PD probes simultaneously
The heart carries out signal mathematics, realizes temperature and vibration dual sampling；
Using the time of unbalanced pulse laser and narrow linewidth laser as time zero, then at some fixed point after to this support of Raman
The time that Ke Si scatterings light, backward Raman anti-Stokes scattering light and backward Rayleigh scattering light return to bundling device is t；
For backward Raman scattering light, the strong and weak temperature modulation by fibre scattering point of Raman diffused light is transmitted into data
The Stokes ratio and anti-Stokes scattering luminous intensity of processing center are the function of time t and temperature T, i.e. t moment the
The Raman stokes light and Raman anti-Stokes luminous power that one PD probe, second PD probe receive be respectively：
Ps=fs(t,T) (1)
With
Pas=fas(t,T) (2)
Wherein T is the temperature at t moment Asymmetric Twin-Core Fiber fixed point；With Stokes ratio and anti-Stokes scattering light
The ratio of power obtains the distribution of space temperature field to solve temperature regulating, i.e.,：
Ps/Pas=fs(t,T)/fas(t,T) (3)
For backward Rayleigh scattering light, the vibration of external environment can cause backward Rayleigh scattering light phase in Asymmetric Twin-Core Fiber
Variation, i.e., when extraneous oscillation intensity is ν after to the function that Rayleigh scattering light phase is time t and ν：
φ=f (t, ν) (4)
I.e.
ν=f-1(t,φ) (5)
With data processing centre collect time t, two backward Raman scattering light power and backward Rayleigh scattering light phase
Information can specifically obtain the position of measurement point, temperature and vibration information.
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