CN108168686A - Dual wavelength distribution type fiber-optic sound sensor-based system - Google Patents
Dual wavelength distribution type fiber-optic sound sensor-based system Download PDFInfo
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- CN108168686A CN108168686A CN201810208329.5A CN201810208329A CN108168686A CN 108168686 A CN108168686 A CN 108168686A CN 201810208329 A CN201810208329 A CN 201810208329A CN 108168686 A CN108168686 A CN 108168686A
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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 dual wavelength distribution type fiber-optic sound sensor-based system, including：First narrow linewidth laser, second narrow linewidth laser, main coupler, optoisolator, modulator, erbium-doped fiber amplifier, circulator, the first fiber grating, second fiber grating, sensor fibre, wavelength division multiplexer, the first Michelson's interferometer, second Michelson's interferometer, first carrier circuit, second carrier circuit, the first photodetector, the second photodetector, data collecting card, signal processor and impulse generator.Two spaces resolution ratio difference but similar phase demodulating result are realized by wave division multiplex mode, the distributed dynamic vibration or the monitoring of acoustical signal for subtracting each other to obtain high spatial resolution by the two, due to the characteristics of need not reducing interferometer arm length difference and pulse optical width, ensure that the system low noise.
Description
Technical field
The present invention relates to distributing optical fiber sensing fields, are particularly used to measure the distributed light of dynamic vibration or acoustical signal
Fine sensory field.
Background technology
Distributed Optical Fiber Sensing Techniques are an important branch of Fibre Optical Sensor, and phase is transmitted in a fiber using light wave
Position, polarization, amplitude, wavelength etc. can continuously monitor the temperature near optical fiber, strain, shake in real time to extraneous sensitive characteristic
The physical quantitys such as dynamic and sound have good application prospect, main status are occupied in Fibre Optical Sensor market.
Distributed Optical Fiber Sensing Techniques can be divided into according to sensing principle based on interference detection and based on backscatter sounding skill
Two class of art.The former using Mach-zehnder type interferometer, Sagnac type interferometer and it is composite structured by location algorithm and
Demodulating algorithm obtains relevant position and extraneous physical message.The latter utilizes polarization, light intensity, frequency displacement and phase of back-scattering light etc.
Change to measure external 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
It is suitble to the continuous distributed vibration in long range space or sound sensing, has in perimeter security, seismic prospecting, Monitoring Pinpelines etc.
Significant advantage.
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
Extraneous stress or the effect of strain, cause fiber-draw and variations in refractive index, so cause cause back-scattering light transmission when
Phase change, therefore can realize the measurement to extraneous vibration or sound by detecting phase change.Distributed light
Fine sound sensor-based system is there are kinds of schemes, such as the distributed optical fiber sensing system based on phase generated carrier technology, using phase
Position generation carrier phase demodulating algorithm realizes distributed vibration or the measurement of acoustical signal, solves the inspection of Larger Dynamic range signal
It surveys, overcomes influence (Xu Tuanwei etc., the distributed light based on phase generated carrier technology that initial phase drifts about to signal amplitude
Fiber sensor system, application number 201410032610.X).
The spatial resolution of distributed optical fiber sensing system based on phase generated carrier technology depends on interferometer brachium
Difference, at the same it is related with pulse optical width.By reducing interferometer arm length difference and pulse optical width can improve spatial resolution, but with
The reduction of pulse optical width, the decline of back rayleigh scattering light intensity will be led to, and then system noise floor is caused to increase.Space
Resolution ratio is closely related with system signal noise ratio, and pursuing high spatial resolution will cause system noise characteristic to be deteriorated, it is difficult to realize micro-
Weak vibration or the measurement of acoustical signal.
Invention content
(1) technical problems to be solved
It is set forth above at least partly to solve present disclose provides a kind of dual wavelength distribution type fiber-optic sound sensor-based system
Technical problem.
(2) technical solution
According to one aspect of the disclosure, a kind of dual wavelength distribution type fiber-optic sound sensor-based system is provided, including：First is narrow
Line width laser and the second narrow linewidth laser；Main coupler, input terminal connect the first narrow linewidth laser and the second narrow line
The output terminal of wide laser；Optoisolator, input terminal are connected to the output terminal of the main coupler；Modulator, input terminal
It is connected to the output terminal of optoisolator；Erbium-doped fiber amplifier, input terminal are connected to the output terminal of the modulator；It goes in ring
Device, a ports are connected to the output terminal of the erbium-doped fiber amplifier；First fiber grating and the second fiber grating, described
One fiber grating and the second fiber grating composition fiber grating string are connected to the b ports of the circulator；Sensor fibre, connection
To the c ports of the circulator；Wavelength division multiplexer, input terminal are connected to the d ports of the circulator；First Michelson is done
Interferometer and the second Michelson's interferometer, first Michelson's interferometer are connected respectively to the second Michelson's interferometer
Two output ports of wavelength division multiplexer；First carrier circuit and the second carrier circuit, the output terminal of the first carrier circuit connect
Connect the electrical interface of the first Michelson's interferometer；The output terminal of second carrier circuit connects the electricity of the second Michelson's interferometer
Learn interface；First photodetector, the second photodetector, the input port of the first photodetector are done with the first Michelson
The output terminal of interferometer is connected, and the input port of the second photodetector is connected with the output terminal of the second Michelson's interferometer；Number
According to capture card, with multiple input port, be connected respectively to first carrier circuit and the second carrier circuit output terminal, first
The output port of photodetector and the second photodetector；And signal processor, data collecting card is connected to, for passing through
The data of data collecting card acquisition realize the measurement of distributed signal.
In the disclosure some embodiments, first Michelson's interferometer, including：Coupler, the first faraday rotation
Turn device, the second Faraday rotator and first phase modulator, wherein, the first coupler connects the one of wavelength division multiplexer respectively
Output terminal, the input terminal of the first faraday rotation mirror, the input terminal of first phase modulator, the input of the first photodetector
End；The output terminal of first phase modulator is connected with the input terminal of the second faraday rotation mirror, the electricity of first phase modulator
Interface is connected with the output terminal of first carrier circuit.
In the disclosure some embodiments, second Michelson's interferometer, including：Second coupler, third farad
Circulator, the 4th Faraday rotator and second phase modulator, wherein, four ports of the second coupler connect wavelength-division respectively
One output terminal of multiplexer, the input terminal of the 4th faraday rotation mirror, the input terminal of second phase modulator, the second photodetection
The input terminal of device, the output terminal of second phase modulator are connected with the input terminal of the 4th faraday rotation mirror, second phase modulation
The electrical interface of device is connected with the output terminal of the second carrier circuit.
In the disclosure some embodiments, first phase modulator includes piezoelectric ceramic tube with second phase modulator and twines
The single mode optical fiber being wound on outside tube wall, for generating sinusoidal phase modulation.
In the disclosure some embodiments, the one way brachium of the first Michelson's interferometer and the second Michelson's interferometer
Poor different but close, the two difference is between 1m-5m.
In the disclosure some embodiments, first narrow linewidth laser, the second narrow linewidth laser output wavelength
Difference, respectively with the first fiber grating, the centre wavelength of the second fiber grating is consistent.
In the disclosure some embodiments, the impulse generator transmitting repetition pulse voltage signal acts on modulator,
Pulsed optical signals are generated, the wide pulse of pulse voltage signal is 10ns-100ns.
In the disclosure some embodiments, the first phase modulator and second phase modulator by piezoelectric ceramic tube and
The single mode optical fiber composition being wrapped in outside tube wall, for generating sinusoidal phase modulation, modulation amplitude 2rad-4rad.
In the disclosure some embodiments, the dual wavelength distribution type fiber-optic sound sensor-based system, by tool, there are two not
The difference of the phase signal of isospace resolution ratio obtains the measurement of high-space resolution dynamic vibration or acoustical signal, system space point
Resolution is the difference of two Michelson's interferometer one way arm length differences.
(3) advantageous effect
It can be seen from the above technical proposal that the disclosure at least has the advantages that：
Two spaces resolution ratio difference is realized by wave division multiplex mode but similar phase demodulating is as a result, pass through the two phase
Subtract obtain high spatial resolution distributed dynamic vibration or acoustical signal monitoring, due to need not reduce interferometer arm length difference and
Pulse optical width, therefore the characteristics of ensure that the system low noise, so embody high spatial resolution and low noise take into account it is excellent
Gesture.
Description of the drawings
Fig. 1 is the structure diagram of the dual wavelength distribution type fiber-optic sound sensor-based system of the embodiment of the present disclosure.
Fig. 2 is the spatial resolution of the embodiment of the present disclosure and the relationship of spatial sampling resolution ratio.
Fig. 3 is phase demodulating result of the dual wavelength distribution type fiber-optic sound sensor-based system to disturbing signal of the embodiment of the present disclosure
Schematic diagram.
【Embodiment of the present disclosure main element symbol description in attached drawing】
1A, the first narrow linewidth laser；1B, the second narrow linewidth laser
2nd, coupler；3rd, optoisolator
4th, modulator；5th, erbium-doped fiber amplifier
6th, circulator；
7A, the first fiber grating；7B, the second fiber grating
8th, sensor fibre；9th, wavelength division multiplexer
10A, the first coupler；10B, the second coupler
11A, the first Faraday rotator；11B, the second Faraday rotator
11C, third Faraday rotator；11D the 4th is Faraday rotator
12A, first phase modulator 12B second phase modulators
13A first carrier circuits；The second carrier circuits of 13B
The second photodetector of 14A, the first photodetector and 14B
15th, data collecting card；16th, signal processor,
17th, impulse generator；
100A, the first Michelson's interferometer；100B, the second Michelson's interferometer
Specific embodiment
Present disclose provides a kind of dual wavelength distribution type fiber-optic sound sensor-based system, while ensure its low noise advantage, realize
The distributed dynamic vibration or the monitoring of acoustical signal of high spatial resolution low noise overcome resolution ratio and high letter between system altitude
It makes an uproar than the deficiency for being difficult to take into account simultaneously, improves the performance of distribution type fiber-optic sound sensor-based system.
Purpose, technical scheme and advantage to make the disclosure are 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 dual wavelength distribution type fiber-optic sound sensor-based system is provided.
Fig. 1 is the structure diagram of the dual wavelength distribution type fiber-optic sound sensor-based system of the first embodiment of the present disclosure.As shown in Figure 1, this public affairs
The dual wavelength distribution type fiber-optic sound sensor-based system opened, including：
It please referring to Fig.1, the present invention provides dual wavelength distribution type fiber-optic sound sensor-based system, including：
First narrow linewidth laser 1A, the second narrow linewidth laser 1B, main coupler 2, optoisolator 3, modulator 4,
Erbium-doped fiber amplifier 5, circulator 6, the first fiber grating 7A, the second fiber grating 7B, sensor fibre 8, wavelength division multiplexer 9,
First Michelson's interferometer 100A, the second Michelson's interferometer 100B, first carrier circuit 13A, the second carrier circuit
13B, the first photodetector 14A, the second photodetector 14B, data collecting card 15, signal processor 16 and impulse generator
17。
Wherein the output terminal of the first narrow linewidth laser 1A and the second narrow linewidth laser 1B connect with 2 input terminal of main coupler
It connects, the output terminal of main coupler 2 is connect with the input terminal of optoisolator 3, the output terminal of optoisolator 3 and the input of modulator 4
End connection, the output terminal of modulator 4 is connected with the input terminal of erbium-doped fiber amplifier 5, the output terminal of erbium-doped fiber amplifier 5 and
The a ports of circulator 6 are connected, the optical fiber light that the b ports of circulator 6 are formed with the first fiber grating 7A and the second fiber grating 7B
Grid string is connected, and the c ports of circulator 6 are connected with sensor fibre 8, the d ports of circulator 6 and the input terminal phase of wavelength division multiplexer 9
Even, two output ports of wavelength division multiplexer 9 respectively with the first Michelson's interferometer 100A and the second Michelson's interferometer
100B connections, input terminal be connected, the input of the output terminal of the first Michelson's interferometer 100A and the first photodetector 14A
Port is connected, and the output terminal of the second Michelson's interferometer 100B is connected with the input port of the second photodetector 14B, and first
The output port of photodetector 14A and the second photodetector 14B is connected with two input ports of data collecting card 15, and first
The one of the output terminal of carrier circuit 13A while the electrical interface of the first Michelson's interferometer 100A of connection and data collecting card 15
Input port, the output terminal of the second carrier circuit 13B connect the electrical interface sum number of the second Michelson's interferometer 100B simultaneously
According to another input port of capture card 15, the output port of data collecting card 15 is connected with signal processor 16, impulse generator
17 output port is connected with the electrical interface of modulator 4.
Individually below to each composition of the dual wavelength distribution type fiber-optic sound sensor-based system of the present embodiment high spatial resolution
Part is described in detail.
First Michelson's interferometer 100A includes：Coupler 10A, the first Faraday rotator 11A, the second faraday rotation
Four ports for turning device 11B and first phase modulator 12A, the first coupler 10A connect an output of wavelength division multiplexer 9 respectively
End, the input terminal of the first faraday rotation mirror 11A, the input terminal of first phase modulator 12A, the first photodetector 14A's
Input terminal, the output terminal of first phase modulator 12A are connected with the input terminal of the second faraday rotation mirror 11B, first phase tune
The electrical interface of device 12A processed is connected with the output terminal of first carrier circuit 13A.
Second Michelson's interferometer 100B includes：Second coupler 10B, third Faraday rotator 11C, the 4th farad
It is one defeated to connect wavelength division multiplexer 9 respectively for four ports of circulator 11D and second phase modulator 12B, the second coupler 10B
Outlet, the input terminal of the 4th faraday rotation mirror 11C, the input terminal of second phase modulator 12B, the second photodetector 14B
Input terminal, the output terminal of second phase modulator 12B is connected with the input terminal of the 4th faraday rotation mirror 11D, second phase
The electrical interface of modulator 12B is connected with the output terminal of the second carrier circuit 13B.
Wherein, the one way arm length difference of the first Michelson's interferometer 100A and the second Michelson's interferometer 100B it is different but
Close, the two difference is between 1m-5m.
In said program, the output wavelength of the first narrow linewidth laser 1A, the second narrow linewidth laser 1B is different, respectively with
First fiber grating 7A, the centre wavelength of the second fiber grating 7B are consistent.
Impulse generator 17 emits repetition pulse voltage signal and acts on modulator 4, generates pulsed optical signals, pulse voltage
The pulse of signal is wide between 10ns-100ns.
Two phase-modulators are made of piezoelectric ceramic tube and the single mode optical fiber being wrapped in outside tube wall, for generating sinusoidal phase
Position modulation, modulation amplitude is between 2rad-4rad.
By having the difference of the phase signal there are two different spatial resolutions, high-space resolution dynamic vibration or sound are obtained
The measurement of signal, System spatial resolution are the difference of two Michelson's interferometer one way arm length differences.
In the present embodiment, two narrow linewidth lasers are less than using the RIO semiconductor lasers continuously exported, line width
2kHz, operation wavelength are respectively λ1=1550.12nm and λ2=1546.92nm.Two narrow-linewidth lasers with different wave length pass through
Main coupler carries out conjunction beam, and then entering modulator generation through optoisolator is repeated cyclically pulsed light, and modulator uses acousto-optic
Modulator passes through impulse generator load pulses voltage signal, the pulse width of pulse width generally use 10ns~100ns.
Pulse width is small to be helped to provide high spatial resolution, but the power of the small corresponding Rayleigh scattering light of pulse width is small, therefore is
Signal-to-noise ratio of uniting is low.Use the pulse width of 50ns within the system (corresponding space length is 10m).Pulse recurrence frequency is with passing
Defeated fiber lengths are related, and when fiber lengths are 10km, pulse recurrence frequency is up to 10kHz.Pulsed light is after optoisolator
Luminous power amplification is carried out into erbium-doped fiber amplifier, is filtered by circulator and the amplified optical signal of fiber grating pair
Wave, the centre wavelength of fiber grating is consistent with the operation wavelength of narrow linewidth laser, respectively 1550.12nm and 1546.92nm,
Three dB bandwidth is less than 0.2nm, to ensure that the pulsed light into sensor fibre does not include excessive spontaneous emission light, ensures pulsed light
Coherence.
Pulsed light comprising two different wave lengths generates back rayleigh scattering, different location along sensor fibre communication process
Different Rayleigh scattering lights is generated, when the coherence length of narrow linewidth laser is more than Transmission Fibers length, Rayleigh scattering is just
Relevant.The back rayleigh scattering light of sensor fibre is entered by the d ports of circulator by wavelength division multiplexer, and wavelength division multiplexer will
The Rayleigh scattering light of two different wave lengths is detached, and respectively enters coupler, faraday rotation mirror and phase-modulator composition
Michelson's interferometer 100A and 100B.The one way arm length difference of two Michelson's interferometers is different but close, and the two difference is
Between 1m-5m.
For the Rayleigh scattering light of each wavelength, Michelson's interferometer due to there are arm length difference, that is, time delay,
What at a time photodetector received is the interference for two Rayleigh scattering lights that two standoff distances are equal to one way arm length difference
Optical signal, so the one way arm length difference of interferometer is the spatial resolution of Single wavelength distribution type fiber-optic sound sensor-based system.
The Rayleigh scattering light of 1550.12nm and 1546.92nm wavelength respectively enters two Michelson interferences with different arm length differences
The one way arm length difference of instrument, wherein Michelson's interferometer 100A is 10m, and the single armed arm length difference of Michelson's interferometer 100B is
11m, the corresponding spatial resolution of the two are 10m and 11m.Two-way interferes interference signal respectively through corresponding photodetector
The electric signal of a time series is converted into, is received by four-way data collecting card.The single track sample rate of data collecting card is
100MS/s, corresponding spatial sampling interval (i.e. the spatial sampling resolution ratio of system) is 1m, therefore spatial resolution is much larger than sky
Between sampling resolution.For each Michelson's interferometer, different moments correspond to double Rayleigh scattering lights of different location
Interference signal, therefore the interference signal of an interferometer moved along sensor fibre is equivalent to, the arm length difference of interferometer is system
Spatial resolution, each displacement distance are relationship such as Fig. 2 of spatial sampling resolution ratio, spatial resolution and spatial sampling resolution ratio
It is shown.
The electrical signal sequence that the data collecting card of connection Michelson's interferometer receives is stored on signal processor, shape
Data in a row.Sample rate and pulse recurrence frequency of the number of sampling (m) of each row of data depending on data collecting card.For arteries and veins
Rush repetition rate 10kHz, data collecting card sample rate 100MS/s, the sampling number m=10000 of corresponding each row of data.When adopting
After the interference signal sequence that n light pulse of collection generates, the matrix data of mxn will be formed.For the interference signal of same position, by
In being added to phase-modulator on an arm of Michelson's interferometer, (phase-modulator is by piezoelectric ceramic tube and is wrapped in outside tube wall
Single mode optical fiber composition, for generating sinusoidal phase modulation), therefore there are a phase tune in the interference signal in same column data
System, the expression formula of interference fringe are：
V=A+Bcos (Ccos (2 π f0t)+φ(t))
Wherein, A is to be and interferometer input with relevant DC terms, B such as interferometer input light intensity, coupler insertion loss
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.It closes
The demodulation of involved phase signals, phi (t), using phase generated carrier demodulation technology, is believing in above-mentioned interference striped
It is realized on number processor.
Phase generated carrier demodulation algorithm is as follows：The output signal of Michelson's interferometer exports electricity with carrier circuit respectively
A frequency multiplication cos (the 2 π f of signal0And two harmonic cos (4 π f t)0T) it is multiplied, is then contained respectively by low-pass filter
There is the sine term-BJ of phase signals, phi (t)2(C) sin [φ (t)] and cosine term-BJ1(C) cos [φ (t)] (wherein, J1(C) and
J2(C) be respectively 1 rank of the first kind and 2 rank Bessel functions), two be divided by after by arc tangent algorithm be calculated with often system
Several phase signal [J2(C)/J1(C)] φ (t) can determine constant coefficient J by calibration2(C)/J1(C), and then phase is obtained
Position signal psi (t).As C=2.63rad, J2(C)/J1(C)=1 phase letter can, be directly obtained without carrying out constant coefficient calibration
Number φ (t), therefore phase generated carrier demodulation technology generally selects C=2.63rad and is worth as an optimization.
Using two light sources with different wavelengths and two Michelson's interferometers with different arm length differences, by sharing sensing
Optical fiber realizes monitoring of the tool there are two the dynamic vibration or acoustical signal of different spatial resolutions, their corresponding phases
Signal is φλ1(zk, ti), φλ2(zk, ti), zkRepresent the position of sensor fibre, tiRepresent the sampling time of single track signal.To two
Person carries out difference, and the phase information for obtaining the dual wavelength distribution type fiber-optic sound sensor-based system is：
φ(zk, ti)=φ λ2(zk, ti)-φλ1(zk, ti)
As a result of difference processing, therefore the spatial resolution of the dual wavelength distribution type fiber-optic sound sensor-based system is stepped for two
The difference of Ke Erxun interferometer one way arm length differences, due to not reducing pulse width, ensure that system low noise it is excellent
Gesture.
Fig. 3 is phase demodulating result of the dual wavelength distribution type fiber-optic sound sensor-based system to disturbing signal of the embodiment of the present disclosure
Schematic diagram.For the single armed arm length difference of one way the arm length difference 10m, Michelson's interferometer 100B of Michelson's interferometer 100A
11m, then the spatial resolution of the dual wavelength distribution type fiber-optic sound sensor-based system is 1m.As sensor fibre exists at a certain position
Disturbance, for Michelson's interferometer 100A (spatial resolution 10m, spatial sampling resolution ratio 1m), therefore continued presence
10 sampled points are there are disturbing signal, and (spatial resolution 11m, spatial sampling point for Michelson's interferometer 100B
Resolution 1m), therefore there are disturbing signals for 11 sampled points of continued presence.The two phase demodulating result is subtracted each other, sky can be obtained
Between resolution ratio be 1m disturbing signal (spatial sampling resolution ratio is 1m), physical relationship is as shown in Figure 3.
The disclosure realizes two spaces resolution ratio difference by wave division multiplex mode but similar phase demodulating is as a result, pass through
The distributed dynamic vibration or the monitoring of acoustical signal that the two subtracts each other to obtain high spatial resolution, since interferometer arm need not be reduced
The characteristics of growing difference and pulse optical width, therefore ensure that the system low noise, and then embodiment high spatial resolution and low noise are simultaneous
The advantage of Gu.
Certainly, above-mentioned hardware configuration should also include the function modules such as power module (not shown), these are in the art
Those skilled in the art it should be understood that those skilled in the art in the art can also add corresponding according to the needs of function
Function module, therefore not to repeat here.
So far, the dual wavelength distribution type fiber-optic sound sensor-based system of first embodiment of the present disclosure high spatial resolution 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 it in attached drawing or says
In bright book text, the realization method that is not painted or describes 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, " on ", " under ", "front", "rear", " left side ",
" right side " etc. is only the direction of refer to the attached drawing, is not used for limiting the protection domain of the disclosure.Through attached drawing, identical element by
Same or similar reference numeral represents.When understanding of this disclosure may be caused to cause to obscure, conventional structure will be omitted
Or construction.
Unless there are known entitled phase otherwise meaning, the numerical parameter in this specification and appended claims are approximations, 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 representing composition, reaction condition etc., it is thus understood that repaiied by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning of expression refers to include 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.
Specification and the word of 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
The element for having identical name can make clear differentiation.
In addition, unless specifically described or the step of must sequentially occur, there is no restriction in more than 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, required by constructing 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 it 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 be by means of including the hardware of several different elements and by means of properly programmed computer
It realizes.The all parts embodiment of the disclosure can be with hardware realization or to be run on one or more processor
Software module is realized or is realized with combination thereof.It it will be understood by those of skill in the art that can be in practice using 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 performing 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 have the form of one or more signal.Such signal can
It obtains either providing on carrier signal or providing in the form of any other to download from internet website.
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 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 is (including adjoint power
Profit requirement, 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.If also, in the unit claim for listing equipment for drying, 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：I.e. required guarantor
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 embodiment are expressly incorporated in the specific embodiment, wherein each claim is in itself
All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out the purpose, technical solution and advantageous effect of the disclosure further in detail
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 (9)
1. a kind of dual wavelength distribution type fiber-optic sound sensor-based system, including：
First narrow linewidth laser (1A) and the second narrow linewidth laser (1B)；
Main coupler (2), input terminal connect the output of the first narrow linewidth laser (1A) and the second narrow linewidth laser (1B)
End；
Optoisolator (3), input terminal are connected to the output terminal of the main coupler (2)；
Modulator (4), input terminal are connected to the output terminal of optoisolator (3)；
Erbium-doped fiber amplifier (5), input terminal are connected to the output terminal of the modulator (4)；
Circulator (6), a ports are connected to the output terminal of the erbium-doped fiber amplifier (5)；
First fiber grating (7A) and the second fiber grating (7B), first fiber grating (7A) and the second fiber grating (7B)
Fiber grating string is formed, is connected to the b ports of the circulator (6)；
Sensor fibre (8) is connected to the c ports of the circulator (6)；
Wavelength division multiplexer (9), input terminal are connected to the d ports of the circulator (6)；
First Michelson's interferometer (100A) and the second Michelson's interferometer (100B), first Michelson's interferometer
(100A) is connected respectively to two output ports of wavelength division multiplexer (9) with the second Michelson's interferometer (100B)；
First carrier circuit (13A) and the second carrier circuit (13B), the output terminal connection of the first carrier circuit (13A) the
The electrical interface of one Michelson's interferometer (100A)；The output terminal of second carrier circuit (13B) connects the second Michelson and does
The electrical interface of interferometer (100B)；
First photodetector (14A), the second photodetector (14B), the input port of the first photodetector (14A) and
The output terminal of one Michelson's interferometer (100A) is connected, the input port of the second photodetector (14B) and the second Michael
The output terminal of inferior interferometer (100B) is connected；
Data collecting card (15) with multiple input port, is connected respectively to first carrier circuit (13A) and the second carrier wave electricity
The output port of the output terminal on road (13B), the first photodetector (14A) and the second photodetector (14B)；And
Signal processor (16) is connected to data collecting card (15), and the data for passing through data collecting card (15) acquisition are realized
The measurement of distributed signal.
2. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 1, first Michelson's interferometer
(100A), including：
Coupler (10A), the first Faraday rotator (11A), the second Faraday rotator (11B) and first phase modulator
(12A), wherein, four ports of the first coupler (10A) connect an output terminal of wavelength division multiplexer (9), the first faraday respectively
The input terminal of revolving mirror (11A), the input terminal of first phase modulator (12A), the input terminal of the first photodetector (14A)；
The output terminal of first phase modulator (12A) is connected with the input terminal of the second faraday rotation mirror (11B), first phase modulator
The electrical interface of (12A) is connected with the output terminal of first carrier circuit (13A).
3. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 2, second Michelson's interferometer
(100B), including：
Second coupler (10B), third Faraday rotator (11C), the 4th Faraday rotator (11D) and second phase modulation
Device (12B), wherein, four ports of the second coupler (10B) connect an output terminal of wavelength division multiplexer (9) respectively, the 4th farad
The input terminal of revolving mirror (11C), the input terminal of second phase modulator (12B), the input of the second photodetector (14B)
End, the output terminal of second phase modulator (12B) are connected with the input terminal of the 4th faraday rotation mirror (11D), second phase tune
The electrical interface of device (12B) processed is connected with the output terminal of the second carrier circuit (13B).
4. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 3, wherein, first phase modulator (12A)
Include piezoelectric ceramic tube and the single mode optical fiber being wrapped in outside tube wall with second phase modulator (12B), for generating sinusoidal phase
Modulation.
5. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 3, wherein, the first Michelson's interferometer
(100A) is different but close with the one way arm length difference of the second Michelson's interferometer (100B), and the two difference is between 1m-5m.
6. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 1, first narrow linewidth laser (1A),
The output wavelength of second narrow linewidth laser (1B) is different, respectively with the first fiber grating (7A), the second fiber grating (7B)
Centre wavelength is consistent.
7. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 6, impulse generator (17) transmitting repeats arteries and veins
It rushes voltage signal and acts on modulator (4), generate pulsed optical signals, the wide pulse of pulse voltage signal is 10ns-100ns.
8. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 3, the first phase modulator (12A) and
Second phase modulator (12B) is made of piezoelectric ceramic tube and the single mode optical fiber being wrapped in outside tube wall, for generating sinusoidal phase
Modulation, modulation amplitude 2rad-4rad.
9. dual wavelength distribution type fiber-optic sound sensor-based system according to claim 1, by tool, there are two different spaces resolutions
The difference of the phase signal of rate, obtains the measurement of high-space resolution dynamic vibration or acoustical signal, and System spatial resolution is stepped for two
The difference of Ke Erxun interferometer one way arm length differences.
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