CN108489594A - Hybrid optical fiber sensor system based on phase generated carrier technology - Google Patents
Hybrid optical fiber sensor system based on phase generated carrier technology Download PDFInfo
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- 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
Present disclose provides a kind of hybrid optical fiber sensor systems based on phase generated carrier technology, including：Narrow linewidth laser, modulator, impulse generator, isolator, erbium-doped fiber amplifier, circulator, fiber grating, pumping source, wavelength division multiplexer, optical fiber dfb laser array, Michelson's interferometer, dense wavelength division demultiplexing module, avalanche diode detector, photodetector array, carrier circuit, data collecting card, signal processing module and display.The measurement of distributed acoustic sensing and optical fiber dfb laser array mixing vibration or acoustical signal is realized by using phase generated carrier technology, the characteristics of having merged feature and the distributed acoustic sensing technology magnanimity channel of optical fiber dfb laser array high sensitivity, realizes the distributed measurement of highly sensitive small-signal.
Description
Technical field
This disclosure relates to which distributing optical fiber sensing field, especially is used to measure the distributed light of dynamic vibration or acoustical signal
Fine sensory field more particularly to a kind of hybrid optical fiber sensor system based on phase generated carrier technology.
Background technology
Optical fiber sensing technology be with Fibre Optical Communication Technology the 1970s emerge rapidly one kind with optical fiber for matchmaker
Matter, light are carrier, and the emerging technology of perception and transmission outer signals, the technology is with high sensitivity, electromagnetism interference, insulating properties
The advantages that good, corrosion-resistant, convenient for networking and long distance transmission, it is suitably applied oil-gas exploration high temperature high pressure, strong electromagnetic, strong spoke
The subsurface environment penetrated.Optical fiber vibration sensing is an important branch of optical fiber sensing technology, is divided into point type according to sensing range and divides
Cloth two types have taken a series of progress in field of seismic exploration in recent years.
Point type optical fibre vibration sensor includes mainly several schemes such as interference formula, fiber Bragg grating type, optical-fiber laser formula, wherein
Optical-fiber laser formula utilizes ultra-narrow distributed feedback optical fiber laser (Distributed Feedback Fiber Lasers, DFB-
FLs core devices) are used as, the detection to extraneous Vibration Signal in Frequency Domain is realized through sensitized reaction and high-accuracy wavelength demodulation techniques.
It is with the features such as high sensitivity, anti-electromagnetic interference capability is strong, size is small.But this point type wave detector still suffers from and tradition inspection
Wave device similar problem, that is, being multiplexed scale is smaller causes its detection range limited, it is difficult to it is distributed to meet high spatial resolution
Acquisition requires.
Distributed Optical Fiber Sensing Techniques can be divided mainly into based on principle of interference according to sensing principle and be visited based on back scattering
Two class of survey technology.The former using M-Z type, Sagnac types and it is composite structured obtained to demodulating algorithm by location algorithm it is related
Location information and extraneous physical message.The latter is measured outer using variations such as the polarization of back-scattering light, light intensity, frequency displacement and phases
Boundary's physical quantity.Common type includes phase sensitive optical time domain reflection type (Φ-OTDR), polarized light time domain reflection type (P-OTDR),
Brillouin light Time Domain Reflectometry type (B-OTDR), Raman optical time domain reflection type (R-OTDR) etc..Wherein, Φ-OTDR are suitble to over long distances
The distributed vibration of high spatial resolution or sound sensing, have significantly excellent in perimeter security, seismic prospecting, Monitoring Pinpelines etc.
Gesture.
Φ-OTDR technique is to realize that distribution is shaken by detecting the phase signal of back rayleigh scattering light in sensor fibre
Dynamic or sound sensing.When extraneous vibration or sound act on a certain position of sensor fibre, the optical fiber at the position will be experienced
The effect of extraneous stress or strain causes fiber-draw and variations in refractive index, and then causes to cause back-scattering light in transmission
Phase change, therefore can realize the measurement to extraneous vibration or sound by detecting phase change.There is research people
Member proposes that a kind of effective method for detecting phases is to use phase generated carrier demodulation technology, and the demodulating algorithm in interference by believing
Introduced in number significantly, the phase-modulation of high speed, make the phase point of interferometer with respect to average temperature.It is strange using interference fringe carrier wave
Phase signal to be measured is carried on the sideband of secondary frequency and even frequency, and the two cancellation is mutually grown, interference signal and a frequency multiplication is same
Step carrier wave and two frequency multiplication sync carriers carry out coherent demodulation respectively, obtain the quadrature component that a pair includes phase to be measured, then
Phase bit extraction is carried out again, to realize phase demodulating.Distributed optical fiber sensing system based on phase generated carrier technology can
Realize the tens thousand of track datas of full size real-time detection, but due to its detection be extraneous vibration or sound wave caused by general single mode light
The strain of fine part, still suffers from the relatively low problem of sensitivity.
Invention content
(1) technical problems to be solved
Present disclose provides a kind of hybrid optical fiber sensor systems based on phase generated carrier technology, at least partly to solve
Technical problem certainly set forth above.
(2) technical solution
According to one aspect of the disclosure, a kind of mixed type Fibre Optical Sensor system based on phase generated carrier technology is provided
System, including：Narrow linewidth laser；The output end of modulator, input terminal and narrow linewidth laser connects；Optoisolator, it is defeated
Enter end with the output end of modulator to be connected；Erbium-doped fiber amplifier, input terminal are connected with the output end of optoisolator；It goes in ring
The ports a of device, the circulator are connected with the output end of erbium-doped fiber amplifier；Fiber grating, the ports the b phase with circulator
Even；Wavelength division multiplexer, the ports c of the wavelength division multiplexer are connected with the ports c of circulator, the ports a of wavelength division multiplexer and pump
The output end in Pu source is connected；Optical fiber dfb laser array is connected with the ports b of the wavelength division multiplexer, Michelson interference
Instrument is connected with the ports d of circulator；Dense wavelength division demultiplexing module, the output end phase of input terminal and Michelson's interferometer
Even；Avalanche diode detector, the interference signal exported by the Michelson's interferometer for acquiring Rayleigh scattering light,
Input port is connected with the output end of dense wavelength division demultiplexing module, and output port connects data acquisition processing device；Photoelectricity is visited
Device array is surveyed, the interference signal exported by interferometer for acquiring the optical fiber dfb laser array output laser, input
Port is connected with the output end of dense wavelength division demultiplexing module, and output port connects data acquisition processing device；And carrier wave electricity
Road, output end connect the electrical interface of Michelson's interferometer and the input port of data acquisition processing device simultaneously.
In the disclosure some embodiments, the optical fiber dfb laser array includes that multiple optical fiber Distributed Feedback Lasers form
Sensor array and the general single mode fiber for meeting ITU-T.G.652 requirements, pass through general single mode between the optical fiber Distributed Feedback Laser
Optical fiber connects, and the centre wavelength of each optical fiber Distributed Feedback Laser is different, ranging from 1525nm~1565nm.
In the disclosure some embodiments, the pumping source of DFB optical fiber lasers is the pumping source of 980nm, DFB optical-fiber lasers
It is connected by the general single mode fiber of 10m long between device, cascade series is 32 yuan, and mixing sensor-based system maximum distance sensing is
10km。
In the disclosure some embodiments, the Michelson's interferometer includes：Three-dB coupler, the first Faraday rotation
Device, the second Faraday rotator and phase-modulator, the ends a of three-dB coupler are connected with the ports d of circulator, three-dB coupler
The ends b are connected with faraday rotation mirror, and the ends c of three-dB coupler are connected with the input terminal of phase-modulator.
In the disclosure some embodiments, for generating sinusoidal phase modulation, modulation amplitude exists the phase-modulator
Between 2rad-4rad.
In the disclosure some embodiments, the hybrid optical fiber sensor system further includes：Impulse generator, it is described
The output port of impulse generator is connected with the electrical interface of modulator, and trigger output end mouth and the data of impulse generator acquire
The triggering input port of card is connected.
In the disclosure some embodiments, impulse generator acts on modulator transmitting repetition pulse voltage signal, generates
The pulse width of pulsed optical signals, pulse voltage signal is 10ns-100ns.
In the disclosure some embodiments, the output wavelength of narrow linewidth laser is consistent with the centre wavelength of fiber grating,
The three dB bandwidth of fiber grating is less than 0.2nm.
In the disclosure some embodiments, the channel spacing of dense wavelength division demultiplexer is 300GHz, adjacency channel isolation
Degree is 45dB.
In the disclosure some embodiments, the data acquisition processing device includes data collecting card, signal processing module
And display, wherein the input port of data collecting card and avalanche diode detector and the output end of photodetector array
Mouth is connected, and the output port of data collecting card is connected with the input terminal of signal processing module, the display port of signal processing module
It is connected with display；The interference signal that the data collecting card receives is respectively that Rayleigh scattering light passes through Michelson's interferometer
The interference signal that interference signal and DFB optical fiber lasers the output laser of output are exported by interferometer, the first interference signal
Carrier technology is generated to demodulate phase signal by parsing interference signal by high-speed figure, completes distributed acoustic transducing signal
Demodulation；Second of interference signal generates carrier technology by low-speed digital and parses interference signal, and then demodulates phase signal, complete
At DFB fiber laser array sensing signal demodulations.
(3) advantageous effect
It can be seen from the above technical proposal that hybrid optical fiber sensor system of the disclosure based on phase generated carrier technology
At least have the advantages that one of them：
(1) realize that distributed acoustic sensing and optical fiber dfb laser array mix by using phase generated carrier technology
Feature and the distributed acoustic sensing technology sea of optical fiber dfb laser array high sensitivity have been merged in vibration or the measurement of acoustical signal
The characteristics of measuring channel, realizes the distributed measurement of highly sensitive small-signal；
(2) realize that distributed acoustic sensing and optical fiber dfb laser array mix by using phase generated carrier technology
Vibration or the measurement of acoustical signal, can overcome distance sensing and signal-to-noise ratio in current distributed acoustic sensor-based system to be difficult to take into account simultaneously
Deficiency.
Description of the drawings
Fig. 1 is the structural representation of hybrid optical fiber sensor system of the embodiment of the present disclosure based on phase generated carrier technology
Figure.
Fig. 2 is the flow chart of embodiment of the present disclosure phase generated carrier demodulation technology.
【Embodiment of the present disclosure main element symbol description in attached drawing】
1, narrow linewidth laser；2, modulator
3, impulse generator；4, isolator
5, erbium-doped fiber amplifier；6, circulator
7, fiber grating；8, pumping source
9, wavelength division multiplexer；10, optical fiber Distributed Feedback Laser
11, general single mode fiber；12, the first Faraday rotator
13, the second Faraday rotator；14, phase-modulator
15, three-dB coupler；16, dense wavelength division demultiplexing module,
17, avalanche diode detector；18, photodetector array
19, carrier circuit；20, data collecting card
21, signal processing module；22, display
100, dfb laser array；200, Michelson's interferometer
Specific implementation mode
Present disclose provides a kind of hybrid optical fiber sensor systems based on phase generated carrier technology, in conjunction with distributed acoustic
The characteristics of sensing technology and optical-fiber laser sensor-based network technology, realizes that distributed highly sensitive Vibration Signal in Frequency Domain measures.
To make the purpose, technical scheme and advantage of the disclosure be more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
Disclosure some embodiments will be done with reference to appended attached drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be shown.In fact, the various embodiments of the disclosure can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, these embodiments are provided so that the disclosure meets applicable legal requirement.
In first exemplary embodiment of the disclosure, a kind of mixed type based on phase generated carrier technology is provided
Optical fiber sensing system.Fig. 1 is hybrid optical fiber sensor system of the first embodiment of the present disclosure based on phase generated carrier technology
Structural schematic diagram.As shown in Figure 1, hybrid optical fiber sensor system of the disclosure based on phase generated carrier technology, including：Narrow line
Wide laser 1, modulator 2, impulse generator 3, isolator 4, erbium-doped fiber amplifier 5, circulator 6, fiber grating 7, pumping
Source 8, wavelength division multiplexer 9, optical fiber dfb laser array 100, Michelson's interferometer 200, dense wavelength division demultiplexing module 16,
Avalanche diode detector 17, photodetector array 18, carrier circuit 19, data collecting card 20,21 and of signal processing module
Display 22.
Wherein, the input terminal of modulator 2 is connect with the output end of narrow linewidth laser 1, the input terminal and tune of optoisolator 4
The output end of device 2 processed is connected, and the input terminal of erbium-doped fiber amplifier 5 is connected with the output end of optoisolator 4, the ends a of circulator 6
Mouth is connected with the output end of erbium-doped fiber amplifier 5, and the ports b of circulator 6 are connected with fiber grating 7, a of wavelength division multiplexer 9
Port is connected with the output end of pumping source 8, and the ports c of wavelength division multiplexer 9 are connected with the ports c of circulator 6, optical fiber DFB laser
Device array 100 is connected with the ports b of wavelength division multiplexer 9, the input terminal of Michelson's interferometer 200 and the ports the d phase of circulator 6
Even, the input terminal of dense wavelength division demultiplexing module 16 is connected with the output end of Michelson's interferometer 200, avalanche diode detection
The input port of device 17 and photodetector array 18 is connected with the output end of dense wavelength division demultiplexing module 16 simultaneously, and data are adopted
The input port of truck 20 is connected with the output port of avalanche diode detector 17 and photodetector array 18, data acquisition
The output port of card 20 is connected with the input terminal of signal processing module 21, display port and the display 22 of signal processing module 21
Be connected, the output end of carrier circuit 19 connect simultaneously Michelson's interferometer 200 electrical interface and data collecting card 20 it is defeated
The output port of inbound port, impulse generator 3 is connected with the electrical interface of modulator 2, the trigger output end mouth of impulse generator 3
It is connected with the triggering input port of data collecting card 20.
In the present embodiment, the optical fiber dfb laser array 100 includes optical fiber Distributed Feedback Laser 10 and general single mode fiber
11, it is connected by general single mode fiber 11 between optical fiber Distributed Feedback Laser 10, the centre wavelength of each optical fiber Distributed Feedback Laser 10 is not
Same but difference very little, ranging from 1525nm~1565nm.
The Michelson's interferometer 200 includes：Three-dB coupler 15, the first Faraday rotator 12, the second faraday rotation
Turn device 13 and phase-modulator 14, the ends a of three-dB coupler 15 are connected with the ports d of circulator 6, the ends b of three-dB coupler 15 and
Faraday rotation mirror 12 is connected, and the ends c of three-dB coupler 15 are connected with the input terminal of phase-modulator 14.
The hybrid fiber sensor-based system is by distributed acoustic sensor-based system and optical fiber dfb laser array sensor-based system complex group
At.Two kinds of sensor-based systems have shared the end c, d of circulator 6, Michelson's interferometer 200, and dense wavelength division demultiplexing module 16 carries
Wave circuit 19, data collecting card 20, the devices such as signal processing module 21 and display 22.
Preferably, the output wavelength of narrow linewidth laser and the centre wavelength of fiber grating are consistent, the 3dB bands of fiber grating
Width is less than 0.2nm.
Preferably, impulse generator transmitting repetition pulse voltage signal acts on modulator, generates pulsed optical signals, pulse
The pulse width of voltage signal is 10ns-100ns.
Preferably, phase-modulator is for generating sinusoidal phase modulation, and modulation amplitude is between 2rad-4rad.
In the present embodiment, sensing unit include different centre wavelengths DFB optical fiber lasers composition sensor array and
General single mode fiber, the wherein pumping source of DFB optical fiber lasers are the pumping source of 980nm, by 10m between DFB optical fiber lasers
Long general single mode fiber connection, for cascade series up to 32 yuan, mixing sensor-based system maximum distance sensing is 10km；General single mode
Optical fiber is the single mode optical fiber for meeting ITU-T.G.652 requirements.
In the present embodiment, selection be channel spacing 300GHz (i.e. 2.4nm), adjacent channel isolation 45dB intensive wave
Decomposition multiplex device.
It is a kind of to be done by what interferometer exported for Rayleigh scattering light there are two different interference signals in the present embodiment
Signal is related to, another kind is the interference signal that DFB optical fiber lasers export that laser is exported by interferometer, and two kinds of signals pass through respectively
Avalanche diode detector is acquired with photodetector array, is eventually transferred into data collecting card.
In the present embodiment, the interference signal that data collecting card receives is respectively that Rayleigh scattering light is exported by interferometer
The interference signal that interference signal and DFB optical fiber lasers output laser are exported by interferometer.The first interference signal passes through height
Speed digital generates carrier technology to parse interference signal and then demodulate phase signal, to complete distributed acoustic transducing signal solution
It adjusts；Second of interference signal demodulates phase signal by low-speed digital generation carrier technology by parsing interference signal, from
And complete DFB fiber laser array sensing signal demodulations.
In the present embodiment, hybrid optical fiber sensor system is by optical fiber distributed type sound sensor-based system and optical fiber Distributed Feedback Laser
The compound composition of array sensor system.In distributed acoustic sensor-based system, narrow linewidth laser is partly led using the RIO continuously exported
Body laser, line width are less than 2kHz, operation wavelength 1550.12nm.The modulated device of narrow-linewidth laser continuously exported generates week
Phase property repetition pulse light, modulator uses acousto-optic modulator, by impulse generator load pulses voltage signal, pulse width by
It is limited to the rise and fall time of acousto-optic modulator, the pulse width of generally use 10ns~100ns, pulse recurrence frequency and transmission
Fiber lengths are related, and when fiber lengths are 10km, pulse recurrence frequency is up to 10kHz.Pulsed light is laggard through optoisolator
Enter erbium-doped fiber amplifier and carry out luminous power amplification, is filtered by circulator and the amplified optical signal of fiber grating pair,
The centre wavelength of fiber grating is consistent with the operation wavelength of narrow linewidth laser, and the three dB bandwidth of fiber grating is less than 0.2nm, with
Ensure that the pulsed light into sensor fibre does not include excessive spontaneous emission light, ensures the coherence of pulsed light.
Pulsed light generates back rayleigh scattering along sensor fibre transmission process, and different location generates different Rayleigh scatterings
Light, when the coherence length of narrow linewidth laser is more than Transmission Fibers length, what Rayleigh scattering was just concerned with.The back of the body of sensor fibre
Entered to Rayleigh scattering light by the ports d of circulator and is stepped by what three-dB coupler, faraday rotation mirror and phase-modulator formed
Ke Erxun interferometers, Michelson's interferometer is since there are arm length difference, that is, time delay, at a time photodetector receptions
To be two standoff distances be equal to arm length difference half two Rayleigh scattering lights interference light signal.After single pulse is sent out,
Different moments correspond to double Rayleigh scattering optical interference signals of different location, and interference signal passes to snowslide after wavelength division multiplexer
Diode detector is converted into the electric signal of a time series, is finally received by data collecting card.
For the interference signal of same position, due to being added to phase-modulator on an arm of Michelson's interferometer,
The expression formula of interference fringe is：
V=A+Bcos (Ccos (2 π f0t)+φ(t))
Wherein, A is to be and interferometer input with the relevant DC terms such as interferometer input light intensity, coupler insertion loss, B
Related, the B=kA such as light intensity, coupler splitting ratio, interferometer extinction ratio correlation, k are visibility of interference fringes, and k ＜ 1, C are interference
The modulation amplitude of instrument, value is between 2rad~4rad, f0For carrier modulation frequency, φ (t) is phase signal to be demodulated.
In the implementation case, in optical fiber dfb laser array sensor-based system, pumping source is partly led using what is continuously exported
Body laser, centre wavelength 980nm, pumping light power 300mW.Pump light enters optical fiber DFB laser through wavelength division multiplexer
Device array makes its lasing simultaneously, and for the laser after lasing after extraneous vibration signal or acoustic signals modulation, reverse transfer passes through wave
Division multiplexer enters circulator, enters through the ports circulator d and is made of three-dB coupler, faraday rotation mirror and phase-modulator
Michelson's interferometer.The line width of optical fiber Distributed Feedback Laser is extremely narrow, and Chinese Academy of Sciences's semiconductor is used to grind in case study on implementation
Study carefully the optical fiber Distributed Feedback Laser ground certainly, line width is only 3kHz, and coherence length is up to tens of kms.Therefore Michelson can be utilized
Faint wavelength shift caused by extraneous vibration or sound wave is enlarged into the phase change that can be detected by the arm length difference of interferometer.
The laser for carrying wavelength modulation signal generates interferometric fringe signal after non-equilibrium fibre optic interferometer, is represented by：
By the modulated interference fringe of phase carrier, it is represented by：
Wherein, I0For the lasing power of DFB optical fiber lasers, η is optical path loss, and k is visibility of interference fringes, and A, B divide
Not Wei interference fringe DC terms, exchange item, C be PGC phase-modulation amplitudes, ω0For PGC modulating frequencies.
Then by phase generated carrier algorithm, phase information is extracted from interference fringe, by corresponding phase variation and
The correspondence of wavelength shift completes Wavelength demodulation, and correspondence is：
Finally by the vibration information that reduction after calibration is extraneous.WhereinFor phase changing capacity, φ0For initial phase,
λBFor Distributed Feedback Laser centre wavelength, Δ λBFor wavelength variable quantity, n is effective refractive index, and d is interferometer arm length difference.
About phase signals, phi (t) involved in above two interference fringe (or) demodulation, what is used is all
Phase generated carrier demodulation technology realizes that detailed process is as shown in Figure 2 on signal processor.
The output signal of Michelson's interferometer exports a frequency multiplication cos (the 2 π f of electric signal with carrier circuit respectively0T) and
Two harmonic cos (2 π (2f0) t) be multiplied, then obtained respectively containing phase signals, phi (t) just by low-pass filter
String item-BJ2(C) sin [φ (t)] and cosine term-BJ1(C) cos [φ (t)] (wherein, J1(C) and J2(C) it is respectively the first kind 1
Rank and 2 rank Bessel functions), two be divided by after the phase signal [J with constant coefficient is calculated by arc tangent algorithm2
(C)/J1(C)] φ (t) can determine constant coefficient J by calibration2(C)/J1(C), and then phase signal is obtained.Work as C=
When 2.63rad, J2(C)/J1(C)=1 phase signals, phi (t), therefore phase can, be directly obtained without carrying out constant coefficient calibration
Generation carrier demodulation techniques generally select C=2.63rad and are worth as an optimization.
So far, hybrid optical fiber sensor system of the first embodiment of the present disclosure based on phase generated carrier technology has been introduced
Finish.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that in attached drawing or saying
In bright book text, the realization method for not being painted or describing is form known to a person of ordinary skill in the art in technical field, and
It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific
Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ",
" right side " etc. is only the direction of refer to the attached drawing, not is used for limiting the protection domain of the disclosure.Through attached drawing, identical element by
Same or similar reference numeral indicates.When that understanding of this disclosure may be caused to cause to obscure, conventional structure will be omitted
Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure
Content.In addition, in the claims, any reference mark between bracket should not be configured to the limit to claim
System.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
Enough required characteristic changings according to as obtained by content of this disclosure.Specifically, all be used in specification and claim
The number of the middle content for indicating composition, reaction condition etc., it is thus understood that repaiied by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning expressed refers to including by specific quantity ± 10% variation in some embodiments, at some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.Before element
Word "a" or "an" does not exclude the presence of multiple such elements.
The word of specification and ordinal number such as " first ", " second ", " third " etc. used in claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Sequence in sequence or manufacturing method, the use of those ordinal numbers are only used for enabling the element with certain name and another tool
There is the element of identical name that can make clear differentiation.
In addition, unless specifically described or the step of must sequentially occur, there is no restriction in the above institute for the sequence of above-mentioned steps
Row, and can change or rearrange according to required design.And above-described embodiment can be based on the considerations of design and reliability, that
This mix and match is used using or with other embodiment mix and match, i.e., the technical characteristic in different embodiments can be freely combined
Form more embodiments.
Algorithm and display be not inherently related to any certain computer, virtual system or miscellaneous equipment provided herein.
Various general-purpose systems can also be used together with teaching based on this.As described above, it constructs required by this kind of system
Structure be obvious.In addition, the disclosure is not also directed to any certain programmed language.It should be understood that can utilize various
Programming language realizes content of this disclosure described here, and the description done above to language-specific is to disclose this public affairs
The preferred forms opened.
The disclosure can by means of include several different elements hardware and by means of properly programmed computer come
It realizes.The all parts embodiment of the disclosure can be with hardware realization, or to run on one or more processors
Software module is realized, or is realized with combination thereof.It will be understood by those of skill in the art that can use in practice micro-
Processor or digital signal processor (DSP) are some or all in the relevant device according to the embodiment of the present disclosure to realize
The some or all functions of component.The disclosure be also implemented as a part for executing method as described herein or
Whole equipment or program of device (for example, computer program and computer program product).Such journey for realizing the disclosure
Sequence can may be stored on the computer-readable medium, or can be with the form of one or more signal.Such signal can
It is obtained with being downloaded from internet website, either provided on carrier signal or provided in any other forms.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in the one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it may be used any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, abstract and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.Also, in the unit claims listing several devices, several in these devices can be by same hard
Part item embodies.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect,
Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
The disclosure of shield requires features more more than the feature being expressly recited in each claim.More precisely, as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific implementation mode are expressly incorporated in the specific implementation mode, wherein each claim itself
All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out further in detail the purpose, technical solution and advantageous effect of the disclosure
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the disclosure, is not limited to the disclosure, it is all
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of hybrid optical fiber sensor system based on phase generated carrier technology, including：
Narrow linewidth laser (1)；
Modulator (2), input terminal are connect with the output end of narrow linewidth laser (1)；
Optoisolator (4), input terminal are connected with the output end of modulator (2)；
Erbium-doped fiber amplifier (5), input terminal are connected with the output end of optoisolator (4)；
The ports a of circulator (6), the circulator (6) are connected with the output end of erbium-doped fiber amplifier (5)；
Fiber grating (7) is connected with the ports b of circulator (6)；
The ports c of wavelength division multiplexer (9), the wavelength division multiplexer (9) are connected with the ports c of circulator (5), wavelength division multiplexer
(9) the ports a are connected with the output end of pumping source (8)；
Optical fiber dfb laser array (100) is connected with the ports b of the wavelength division multiplexer (9)；
Michelson's interferometer (200) is connected with the ports d of circulator (6)；
Dense wavelength division demultiplexing module (16), input terminal are connected with the output end of Michelson's interferometer (200)；
Avalanche diode detector (17) is exported by the Michelson's interferometer (200) for acquiring Rayleigh scattering light
Interference signal, input port are connected with the output end of dense wavelength division demultiplexing module (16), and output port connects data acquisition
Processing unit；
Photodetector array (18), it is defeated by interferometer for acquiring optical fiber dfb laser array (100) the output laser
The interference signal gone out, input port are connected with the output end of dense wavelength division demultiplexing module (16), and output port connects data
Acquisition processing device；And
Carrier circuit (19), output end connect the electrical interface and data acquisition process of Michelson's interferometer (200) simultaneously
The input port of device.
2. hybrid optical fiber sensor system according to claim 1, wherein optical fiber dfb laser array (100) packet
Include the sensor array and general single mode fiber (11) of multiple optical fiber Distributed Feedback Laser (10) compositions, wherein
The general single mode fiber (11) meets ITU-T.G.652 requirements；
It is connected by general single mode fiber (11) between the optical fiber Distributed Feedback Laser (10), each optical fiber Distributed Feedback Laser (10)
Centre wavelength is different, ranging from 1525nm~1565nm.
3. hybrid optical fiber sensor system according to claim 2, wherein the pumping source of DFB optical fiber lasers (10) is
The pumping source of 980nm is connected by the general single mode fiber of 10m long between DFB optical fiber lasers, and cascade series is 32 yuan, mixing
Sensor-based system maximum distance sensing is 10km.
4. hybrid optical fiber sensor system according to claim 1, wherein the Michelson's interferometer (200) includes：
Three-dB coupler (15), the first Faraday rotator (12), the second Faraday rotator (13) and phase-modulator (14), 3dB couplings
The ends a of clutch (15) are connected with the ports d of circulator (6), and the ends b of three-dB coupler (15) are connected with faraday rotation mirror (12),
The ends c of three-dB coupler (15) are connected with the input terminal of phase-modulator (14).
5. hybrid optical fiber sensor system according to claim 4, wherein the phase-modulator (14) is for generating just
String phase-modulation, modulation amplitude is between 2rad-4rad.
6. hybrid optical fiber sensor system according to claim 1, further includes：
The output port of impulse generator (3), the impulse generator (3) is connected with the electrical interface of modulator (2), pulse hair
The trigger output end mouth of raw device (3) is connected with the triggering input port of data collecting card (20).
7. hybrid optical fiber sensor system according to claim 6, wherein impulse generator (13) acts on modulator
(2) emit repetition pulse voltage signal, generate pulsed optical signals, the pulse width of pulse voltage signal is 10ns-100ns.
8. hybrid optical fiber sensor system according to claim 1, wherein the output wavelength of narrow linewidth laser (1) with
The centre wavelength of fiber grating is consistent, and the three dB bandwidth of fiber grating is less than 0.2nm.
9. hybrid optical fiber sensor system according to claim 1, wherein the interchannel of dense wavelength division demultiplexer (16)
It is divided into 300GHz, adjacent channel isolation 45dB.
10. hybrid optical fiber sensor system according to claim 1, the data acquisition processing device includes data acquisition
Block (20), signal processing module (21) and display (22), wherein the input port and avalanche diode of data collecting card (20)
The output port of detector (17) and photodetector array (18) is connected, at the output port and signal of data collecting card (20)
The input terminal for managing module (21) is connected, and the display port of signal processing module (21) is connected with display (22)；
The interference signal that the data collecting card (20) receives is respectively that Rayleigh scattering light passes through Michelson's interferometer (200)
The interference signal that interference signal and DFB optical fiber lasers (10) the output laser of output are exported by interferometer, the first interference
Signal is generated by carrier technology parses interference signal by high-speed figure and demodulates phase signal, and distributed acoustic sensing letter is completed
Number demodulation；Second of interference signal is generated by carrier technology parses interference signal by low-speed digital and demodulates phase signal,
Complete DFB fiber laser array sensing signal demodulations.
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