CN206292019U - Distributed fiber-optic sensor monitoring system - Google Patents
Distributed fiber-optic sensor monitoring system Download PDFInfo
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- CN206292019U CN206292019U CN201621320403.5U CN201621320403U CN206292019U CN 206292019 U CN206292019 U CN 206292019U CN 201621320403 U CN201621320403 U CN 201621320403U CN 206292019 U CN206292019 U CN 206292019U
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Abstract
The utility model provides a kind of distributed fiber-optic sensor monitoring system, belong to distributed fiber-optic sensor technical field, the system includes signal light generating device, the first photo-coupler, sensor fibre, beam splitter, the first Polarization Controller, the second Polarization Controller, the first interference modulations device, the second interference modulations device and demodulating equipment.Interference modulations are carried out to the first linearly polarized light that the first Polarization Controller is exported by the first interference modulations device respectively, interference modulations are carried out to the second linearly polarized light that the second Polarization Controller is exported by the second interference modulations device, and then the second interference signal of the first interference signal and the output of the second interference modulations device for demodulating the output of the first interference modulations device obtains corresponding transducing signal, can as much as possible ensure that transducing signal is not lost, be effectively improved the signal to noise ratio of distributed fiber-optic sensor monitoring system.
Description
Technical field
The utility model is related to distributed fiber-optic sensor technical field, in particular to a kind of distributed fiber-optic sensor
Monitoring system.
Background technology
With the high speed development of Chinese national economy, society is increasing to the demand of the energy especially petroleum resources.
In national energy strategy, the construction of Oil ＆ Gas Storage and development relationship to for the development of the national economy and social development provide for a long time,
Stabilization, the strategy of economic, safety energy safeguard are global.After pipeline transportation Shi Ji highways, railway, water route, air transportation
The fifth-largest means of transportation, its state of development directly represent a level for national transportation industry.Therefore the monitoring technology of pipe leakage
Study hotspot as scientific worker.
Distributed Optical Fiber Sensing Techniques are due to sensing space scope is big, sensing is same optical fiber, structure with light is passed
Simply, signal acquisition low cost, cost performance are high etc. in easy to use, unit length is preferably widely used in pipe leakage
In monitoring technology.In existing optical fiber distributed type acoustic monitoring system, using the back of the body between the different unit lengths on sensor fibre
To Rayleigh scattering signal as the carrier of transducing signal, the phase place change solution of the transducing signal on relevant position is further completed
Analysis, to measure transducing signal.However, because back rayleigh scattering signal is very faint, and ambient noise easily changes light and is passing
Polarization state during defeated, causes transducing signal to be submerged in noise signal, causes system to demodulate corresponding sensing letter
Number.
Utility model content
In view of this, a purpose of the present utility model is to provide a kind of distributed fiber-optic sensor monitoring system, to have
Effect ground improves above mentioned problem.
To achieve these goals, the technical scheme that the utility model embodiment is provided is as follows：
The utility model embodiment provide a kind of distributed fiber-optic sensor monitoring system, including signal light generating device,
First photo-coupler, sensor fibre, beam splitter, the first Polarization Controller, the second Polarization Controller, the first interference modulations dress
Put, the second interference modulations device and demodulating equipment, the sensor fibre is used to sense transducing signal.The signal light generating device
The flashlight of generation is input into the sensor fibre by first photo-coupler.The carrying sensing in the sensor fibre
The back rayleigh scattering light of signal returns to first photo-coupler, and the beam splitter is input into through first photo-coupler,
It is divided into the first light beam and the second light beam through the beam splitter.First light beam is processed as through first Polarization Controller
The first interference modulations device is incided after one linearly polarized light, second light beam is processed as through second Polarization Controller
Also the second interference modulations device is incided after second linearly polarized light, wherein, first linearly polarized light and second line
The polarization direction of polarised light meets preset relation.The demodulating equipment is used for first to the first interference modulations device output
Interference signal and the second interference signal of the second interference modulations device output are demodulated and obtain the transducing signal.
In the utility model preferred embodiment, above-mentioned first Polarization Controller and the second Polarization Controller are optical fiber
Coil Polarization Controller, the fiber optic coils Polarization Controller includes the fiber optic coils of the outer wall for being wound in tubular piezoelectric ceramics.
The input of the fiber optic coils of first Polarization Controller is coupled with the first beam splitting end of the beam splitter, and described first is inclined
The output end of fiber optic coils of controller of shaking is coupled with the demodulating equipment.The fiber optic coils of second Polarization Controller it is defeated
Enter end coupled with the second beam splitting end of the beam splitter, the output end of the fiber optic coils of second Polarization Controller with it is described
Demodulating equipment is coupled.The system also includes voltage output device, the tubular piezoelectric ceramics of first Polarization Controller, described
The tubular piezoelectric ceramics and the demodulating equipment of the second Polarization Controller are electrically connected with the voltage output device.
In the utility model preferred embodiment, above-mentioned fiber optic coils are λ/4 fiber optic coils.
In the utility model preferred embodiment, above-mentioned fiber optic coils Polarization Controller also includes the first housing, described
The fiber optic coils of the outer wall of tubular piezoelectric ceramics are wound in be packaged in the first shell body.
In the utility model preferred embodiment, above-mentioned fiber optic coils Polarization Controller also includes motor and power transmission shaft,
The rotating shaft of the motor is connected with the power transmission shaft, and the motor passes through the power transmission shaft and is arranged at first housing bottom
Rotation connector connection.The motor of the motor of first Polarization Controller and second Polarization Controller with the electricity
Pressure output device is electrically connected.The motor of first Polarization Controller is used to drive the fiber optic coils of first Polarization Controller
It is rotated such that the fiber optic coils export first linearly polarized light.The motor of second Polarization Controller is described for driving
The fiber optic coils of the second Polarization Controller are rotated such that the fiber optic coils export second linearly polarized light.
In the utility model preferred embodiment, above-mentioned fiber optic coils Polarization Controller also includes the second housing, encapsulation
There is first housing for being wound in the fiber optic coils of the outer wall of tubular piezoelectric ceramics to be arranged in the second shell body, institute
State the second housing and be provided with the first opening, the second opening and the 3rd opening, described first is open for penetrating the power transmission shaft, institute
State the second opening and enter line for passing the coil of the fiber optic coils, the described 3rd is open for the line for passing the fiber optic coils
Iris out line.
In the utility model preferred embodiment, the polarization direction phase of above-mentioned first linearly polarized light and the second linearly polarized light
It is mutually orthogonal.
In the utility model preferred embodiment, above-mentioned first interference modulations device includes the first fibre optic interferometer, institute
Stating the second interference modulations device includes the second fibre optic interferometer, and the demodulating equipment includes the first polarization beam combiner, the first photoelectricity
Detector and data processor.The output end coupling of the input of first fibre optic interferometer and first Polarization Controller
Close, the input of second fibre optic interferometer is coupled with the output end of second Polarization Controller, first optical fiber is done
Input of the output end of the output end of interferometer and second fibre optic interferometer with first polarization beam combiner is coupled, institute
The output end for stating the first polarization beam combiner is coupled with the input of first photodetector, first photodetector
Output end is electrically connected with the data processor.First linearly polarized light enters at the interference through first fibre optic interferometer
The first interference signal is formed after reason, second linearly polarized light forms second after the interference treatment of second fibre optic interferometer
Interference signal.First interference signal and second interference signal enter first polarization beam combiner, through described the
After the conjunction beam treatment of one polarization beam combiner electric signal into the data processor is converted to through first photodetector.Institute
State data processor and obtain the transducing signal for processing the electric signal.
In the utility model preferred embodiment, above-mentioned first interference modulations device also includes the second photo-coupler, institute
Stating the second interference modulations device also includes the 3rd photo-coupler, and the demodulating equipment also includes the second polarization beam combiner, the 3rd inclined
Shake bundling device, the second photodetector and the 3rd photodetector, and first fibre optic interferometer includes the one 3 × 3rd coupler,
Second fibre optic interferometer includes the 23 × 3rd coupler.The output end of first Polarization Controller and second optocoupler
The first port coupling of clutch, the first port coupling of the second port of second photo-coupler and the one 3 × 3rd coupler
Close, the 3rd port of second photo-coupler couples with the input of first polarization beam combiner, the one 3 × 3rd coupling
The second port of clutch is coupled with the input of second polarization beam combiner, the 3rd port of the one 3 × 3rd coupler with
The input coupling of the 3rd polarization beam combiner.The output end of second Polarization Controller and the 3rd photo-coupler
First port is coupled, and the second port of the 3rd photo-coupler is coupled with the first port of the 23 × 3rd coupler, institute
The 3rd port for stating the 3rd photo-coupler couples with the input of first polarization beam combiner, the 23 × 3rd coupler
Second port is coupled with the input of second polarization beam combiner, the 3rd port of the 23 × 3rd coupler and described
The input coupling of three polarization beam combiners.The input of the output end of second polarization beam combiner and second photodetector
End coupling, the output end of the 3rd polarization beam combiner is coupled with the input of the 3rd photodetector, second light
The output end of electric explorer is electrically connected with the output end of the 3rd photodetector with the data processor.
In the utility model preferred embodiment, above-mentioned first fibre optic interferometer and the second fibre optic interferometer are mikey
The inferior fibre optic interferometer of that.
The distributed fiber-optic sensor monitoring system that the utility model embodiment is provided, sensing letter will be carried by beam splitter
Number back rayleigh scattering light to be split be the first light beam and the second light beam, by the first Polarization Controller and the second polarization control
First light beam and the second beam treatment are met device processed first linearly polarized light and the second line of preset relation for polarization direction respectively
Polarised light.Respectively by the first interference modulations device and the second interference modulations device to the first linearly polarized light and the second linearly polarized light
Interference modulations are carried out, then demodulated device demodulates first interference signal and the second interference modulations of the first interference modulations device output
Second interference signal of device output obtains corresponding transducing signal, can as much as possible ensure that transducing signal is not lost, effectively
Improve the signal to noise ratio of distributed fiber-optic sensor monitoring system.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, below will be to be used needed for embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
Other related accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 shows a kind of structural representation of the distributed fiber-optic sensor monitoring system that the utility model embodiment is provided
Figure；
Fig. 2 shows a kind of structure of the fiber optic coils Polarization Controller that the utility model embodiment is provided at a kind of visual angle
Under schematic diagram；
Fig. 3 shows that a kind of structure of the fiber optic coils Polarization Controller that the utility model embodiment is provided is regarded in another kind
Schematic diagram under angle；
Fig. 4 shows that another structure of the fiber optic coils Polarization Controller that the utility model embodiment is provided is regarded in one kind
Schematic diagram under angle；
Fig. 5 shows that the second housing of the fiber optic coils Polarization Controller that the utility model embodiment is provided is regarded in another kind
Schematic diagram under angle；
Fig. 6 shows another structural representation of the distributed fiber-optic sensor monitoring system that the utility model embodiment is provided
Figure；
Fig. 7 shows the structured flowchart of the phase carrier demodulating algorithm that the utility model embodiment is provided；
Fig. 8 shows another structural representation for the distributed fiber-optic sensor monitoring system that the utility model embodiment is provided
Figure；
Fig. 9 shows the structured flowchart of 3 × 3 coupler demodulation algorithms that the utility model embodiment is provided.
In figure：1- distributed fiber-optic sensor monitoring systems；10- signal light generating devices；The first annular devices of 20-；30- is sensed
Optical fiber；40- beam splitters；The Polarization Controllers of 51- first；The Polarization Controllers of 52- second；50- fiber optic coils Polarization Controllers；
501- fiber optic coils；The housings of 502- first；503- rotates connector；504- coil entrances；505- motors；The housings of 506- second；
507- coils enter line；508- coil Ru Xian bearings；509- power transmission shafts；510- coil outlets；511- coil outlets bearing；
512- first is open；513- second is open；514- coils are exported；515- the 3rd is open；61- the first interference modulations devices；610-
Second circulator；The couplers of 611- the one 3 × 3rd；62- the second interference modulations devices；The circulators of 620- the 3rd；621- the 23 × 3rd
Coupler；70- demodulating equipments；701,711- first polarization beam combiners；The polarization beam combiners of 712- second；The polarization couplings of 713- the 3rd
Device；702,721- first photodetectors；The photodetectors of 722- second；The photodetectors of 723- the 3rd；703,730- data
Processor；80- voltage output devices.
Specific embodiment
In existing optical fiber distributed type acoustic monitoring system, using dorsad auspicious between the different unit lengths on sensor fibre
Sharp scattered signal further completes the phase place change parsing of the transducing signal on relevant position as the carrier of transducing signal, with
Measure transducing signal.However, because back rayleigh scattering signal is very faint, and ambient noise easily changes light in transmitting procedure
In polarization state, cause transducing signal to be submerged in noise signal, cause system to demodulate corresponding transducing signal.
In consideration of it, the utility model embodiment provide a kind of distributed fiber-optic sensor monitoring system, with improve it is above-mentioned by
It is very faint in back rayleigh scattering signal, and ambient noise easily changes polarization state of the light in transmitting procedure, causes sensing
Signal is submerged in noise signal, causes system to demodulate the problem of corresponding transducing signal.
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, is clearly and completely described, it is clear that retouched to the technical scheme in the utility model embodiment
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally described in accompanying drawing herein and
The component of the utility model embodiment for showing can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit requirement
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.
In description of the present utility model, it is necessary to explanation, term " on ", D score, "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " interior ", " outward " are that, based on orientation shown in the drawings or position relationship, or the practicality is new
Orientation or position relationship that type product is usually put when using, are for only for ease of description the utility model and simplify description, and
Be not indicate or imply meaning device or element must have specific orientation, with specific azimuth configuration and operation, therefore
It is not intended that to limitation of the present utility model.Additionally, term " first ", " second " etc. are only used for distinguishing description, and can not manage
Solve to indicate or implying relative importance.
In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " sets
Put ", " connection ", " electrical connection ", " coupling " should be interpreted broadly, for example, it may be being directly connected to or coupling, it is also possible in
Between medium be indirectly connected with or couple, can be two connections of element internal.Wherein, the light between " coupling " expression optics
Coupling.For the ordinary skill in the art, tool of the above-mentioned term in the utility model can be understood with concrete condition
Body implication.
As shown in figure 1, the utility model embodiment provides a kind of distributed fiber-optic sensor monitoring system 1, including signal
Light generating device 10, the first photo-coupler, sensor fibre 30, beam splitter 40, the first Polarization Controller 51, the second Polarization Control
Device 52, the first interference modulations device 61, the second interference modulations device 62 and demodulating equipment 70.
In the present embodiment, signal light generating device 10 is used to produce flashlight, and by flashlight by the first photo-coupler
Input sensor fibre 30.Signal light generating device 10 can include super-narrow line width laser and acousto-optic modulator, and super-narrow line width swashs
The laser that light device sends enters into acousto-optic modulator, continuous laser is modulated into pulse for τ by acousto-optic modulator, the cycle
It is the pulse laser of T, i.e., above-mentioned flashlight is pulse laser.Additionally, signal light generating device 10 can also be put including the first light
Big device and the optical filter of ultra-narrow bandwidth first are coupled successively.Wherein, the first image intensifer is used to improve the energy of flashlight to increase
The propagation distance of plus signal light, the optical filter of ultra-narrow bandwidth first is used to filter the larger pulse of pulsewidth in flashlight.Certainly, believe
Number light generating device 10 can also be using the pulse laser of narrow bandwidth.
Sensor fibre 30 is the simple optical fiber for being distributed in target surface to be measured, for sensing transducing signal.For example, mesh to be measured
When being designated as transporting oil, the pipeline of gas, sensor fibre 30 is distributed in pipe surface, when pipeline is leaked, the external pressure in pipeline
To there are oil, air-flow to go out in the presence of difference at leakage point, so as to produce sound wave.The sound wave that leakage point oil, air-flow go out generation is sensed
Signal will produce disturbance to the flashlight transmitted in sensor fibre 30.Belong to the intrinsic loss of optical fiber due to Rayleigh scattering, this
In embodiment, using the back rayleigh scattering light in sensor fibre 30 as the carrier of transducing signal, by showing loss with sensing
The relation of the length of optical fiber 30 detects the disturbance information that extraneous transducing signal is distributed on sensor fibre 30.
First photo-coupler can be first annular device 20, and first annular device 20 includes first port, second port and the
Three ports, the flashlight exported by signal light generating device 10 is input into by the first port of first annular device 20, second port is defeated
Go out to sensor fibre 30, the back rayleigh scattering light of the carrying transducing signal returned from sensor fibre 30 is from defeated by second port
Enter, the 3rd port is exported to beam splitter 40.Because back rayleigh scattering light is fainter, can be in first annular device 20 and light point
Second image intensifer and the optical filter of ultra-narrow bandwidth second are set between beam device 40.
Beam splitter 40 can be 1 × 2 coupler, or other types of beam splitter, for by incident signal
Light is divided into the first light beam and the second light beam.Preferably, the beam splitting energy ratio of 1 × 2 coupler is 50:50.Beam splitter 40 includes
First beam splitting end and the second beam splitting end, the first light beam are exported by the first beam splitting end, and the second light beam is exported by the second beam splitting end.
The input of the first Polarization Controller 51 is coupled with the first beam splitting end of beam splitter 40, the second Polarization Controller 52
Input coupled with the second beam splitting end of beam splitter 40.First light beam is exported to the first Polarization Controller by the first beam splitting end
51, the second light beam is exported to the second Polarization Controller 52 by the second beam splitting end.First Polarization Controller 51 is used to control the first light
The polarization direction of beam, the output of the first linearly polarized light is converted to by the first light beam.Correspondingly, the second Polarization Controller 52 is also used for control
The polarization direction of the second light beam is made, the second light beam is converted into the output of the second linearly polarized light.And the first Polarization Controller 51 of regulation
With the second polarizer so that the polarization direction of above-mentioned first linearly polarized light and the second linearly polarized light meets preset relation.Preferably,
The preset relation that the polarization direction of above-mentioned first linearly polarized light and the second linearly polarized light meets is：First linearly polarized light and the second line
The polarization direction of polarised light is mutually orthogonal.It should be noted that due to by the first Polarization Controller 51 and the second Polarization Control
The polarization direction of the influence of the degree of regulation of device 52, the first linearly polarized light and the second linearly polarized light may not be it is absolute orthogonal,
In the presence of certain error.
In the present embodiment, the first Polarization Controller 51 and the second Polarization Controller 52 can polarize control using fiber optic coils
Device processed.The concrete structure and principle of fiber optic coils Polarization Controller will be introduced below.
As shown in Fig. 2 fiber optic coils Polarization Controller 50 includes the fiber optic coils of the outer wall for being wound in tubular piezoelectric ceramics
501.The radius of curvature R (m, N) of fiber optic coils 501 is as follows with the winding number of turn, the relational expression of partial wave coefficient：
In formula (1), a is constant, for example, making the single-mode fiber of fibre core and covering, a=0.133 for silica；R is
The radius of optical fiber；N is the winding number of turns；M is partial wave coefficient.
In the present embodiment, fiber optic coils 501 are λ/4 fiber optic coils.Specifically, selected radius is the tubular piezoelectric ceramics of R,
For λ/4 fiber optic coils 501, m=4, corresponding number of turn N is calculated according to formula (1).Optical fiber in fiber optic coils 501 is preferably adopted
With single mode resist bending optical fiber.By single mode resist bending optical fiber tubular piezoelectric ceramics outer wall according to circumferential direction outside piezoelectric ceramics
Coiling N circles on wall, cause the stress in cross section of optic fibre to have anisotropic distribution, due to photoelastic effect using fibre-optical bending
Should, fiber optic materials index distribution is changed, so as to produce additional stress birfringence, cause the change of guided wave polarization state
Change, to realize the control to polarization state so that the linearly polarized light of the polarization direction required for the output user of fiber optic coils 501.
But, on the one hand, because above-mentioned first light beam and the second light beam may not be the elliptically polarized light of standard, but
Partial poolarized light, now existing λ/4 fiber optic coils cannot obtain accurate linearly polarized light；On the other hand, due to optical fiber cable
The radius of curvature R of circle 501 is inaccurate, have impact on the linear polarization output of fiber optic coils 501, is unfavorable for that distributed fiber-optic sensor is supervised
The demodulation of examining system 1.Therefore, in the utility model embodiment, λ/4 fiber optic coils are wound in the outer wall of tubular piezoelectric ceramics, by
There is electromagnetism flex effect in piezoelectric ceramics, when the both positive and negative polarity of piezoelectric ceramics is powered the single mode for being wrapped in outer wall can be caused resistance to
The length of curved fiber, bending radius change, and can produce additional stress birfringence by extruding optical fiber.Therefore,
The voltage value being applied on piezoelectric ceramics by control can be finely adjusted to the parameter of fiber optic coils 501, so as to realize optical fiber
The linear polarization output of coil 501.
Further, fiber optic coils Polarization Controller 50 also includes the first housing 502, is wound in the outer of tubular piezoelectric ceramics
The fiber optic coils 501 of wall are packaged in the first housing 502.Fig. 2 shows the front view of fiber optic coils Polarization Controller 50, Fig. 3
Show the left view of Fig. 2.Specifically, the piezoelectric ceramics wound after finishing is placed in the first housing 502, as shown in figure 3,
First housing 502 is provided with coil entrance 504 and coil outlet 514, the coil of fiber optic coils 501 is entered into line 507 and passes coil
Entrance 504, coil outlet 514 is passed by the coil outlet 510 of fiber optic coils 501.Wherein, coil enters line 507 includes that single mode is resistance to
The positive electrode for entering line and piezoelectric ceramics of curved fiber enters line, and coil outlet 510 includes outlet and the pressure of single mode resist bending optical fiber
The negative electrode outlet of electroceramics.Epoxide-resin glue is circulated into the first housing 502, so as to tubular piezoelectric ceramics will be wound in
The fiber optic coils 501 of outer wall are encapsulated in the first housing 502.First housing 502 can play sound insulation, vibration isolation, fixing function.
Further, in order to more accurately adjust fiber optic coils 501 output linearly polarized light polarization direction, such as Fig. 4 institutes
Show, fiber optic coils Polarization Controller 50 also includes motor 505 and power transmission shaft 509, the bottom of the first housing 502 is provided with rotation and connects
Interface 503.The rotating shaft of motor 505 is connected with power transmission shaft 509, and motor 505 passes through power transmission shaft 509 and is arranged at the first housing 502
The rotation connector 503 of bottom is connected.Now, the rotating shaft of controlled motor 505 is rotated along ω directions and can control optical fiber cable
The deflection angle of circle 501, so as to control the polarization direction of the linearly polarized light of the output of fiber optic coils 501.In the present embodiment, motor
505 can be stepper motor.
Fiber optic coils 501 are λ/4 fiber optic coils, when coil plane turns over α, the linearly polarized light of λ/4 fiber optic coils output
Direction turn over shown in the relation such as formula (2) of β, α and β.
β=4 (1-t) α (2)
In formula (2), t is the constant for reflecting fiber optic materials characteristic, for all doping silicon dioxides, t=0.08.Such as Fig. 4
It is shown, during first predetermined angle of axis of rotation of motor 505, drive power transmission shaft 509 to be rotated along ω directions, and then drive optical fiber cable
Circle 501 rotates the second predetermined angle along ω directions, so that the coil plane of fiber optic coils 501 as shown in Figure 4 initial
Position turns to predeterminated position, the linearly polarized light output of polarization direction needed for realizing.Wherein, the second predetermined angle is inclined according to needed for
Shake direction setting, the first predetermined angle according between the rotating shaft of motor 505 and λ/4 fiber optic coils gearratio set.
Further, as shown in figure 4, fiber optic coils Polarization Controller 50 also include the second housing 506, it is above-mentioned be packaged with around
The first housing 502 for being formed on the fiber optic coils 501 of tubular piezoelectric ceramics outer wall is arranged in the second housing 506.Second housing 506
Function with isolation sound, can be effectively prevented from interference of the external sound signal to the polarization state modulation of fiber optic coils 501.
It should be noted that front views of the Fig. 4 for fiber optic coils Polarization Controller 50, Fig. 5 is the second housing 506 shown in Fig. 4
Left view.As shown in figure 5, in order to pass through power transmission shaft 509, coil to enter line 507 and coil outlet 510, the second housing 506 is provided with
First opening the 512, second opening 513 and the 3rd opening 515.Wherein, the first opening 512 is used to penetrate power transmission shaft 509, and second opens
The coils that mouth 513 is used to pass fiber optic coils 501 enter line 507, and the coils that the 3rd opening 515 is used to pass fiber optic coils 501 go out
Line 510.In order to avoid coil enters line 507 and the generation play of coil outlet 510, as shown in figure 4, coil is entered into line 507 and coil
Outlet 510 enspheres line bearing 508 and coil outlet bearing 511 online using epoxide-resin glue solid point respectively.
When using, the input (the entering line of single mode resist bending optical fiber) of the fiber optic coils 501 of the first Polarization Controller 51 with
The first beam splitting end coupling of beam splitter 40, output end (the single mode resist bending light of the fiber optic coils 501 of the first Polarization Controller 51
Fine outlet) coupled with demodulating equipment 70.The input of the fiber optic coils 501 of the second Polarization Controller 52 and beam splitter 40
Second beam splitting end is coupled, and the output end of the fiber optic coils 501 of the second Polarization Controller 52 is coupled with demodulating equipment 70.
Now, in order to ensure the first Polarization Controller 51 and the polarization light output of the second Polarization Controller 52, and the is caused
The polarization side of the first linearly polarized light of the output of one Polarization Controller 51 and the second linearly polarized light of the output of the second Polarization Controller 52
To meeting above-mentioned preset relation.Needs are adjusted to the first Polarization Controller 51 and the second Polarization Controller 52 respectively.Therefore,
The distributed fiber-optic sensor monitoring system 1 that the present embodiment is provided also includes voltage output device, and voltage output device is filled with demodulation
Put 70 electrical connections.First Polarization Controller 51 is electrically connected with the second Polarization Controller 52 with voltage output device, specifically, the
The piezoelectric ceramics in piezoelectric ceramics and the second Polarization Controller 52 in one Polarization Controller 51 is also electric with voltage output device
Motor 505 in connection, and the Polarization Controller 52 of motor 505 and second in the first Polarization Controller 51 with voltage output dress
Put electrical connection.
Voltage output device is input into first voltage to the piezoelectric ceramics of the first Polarization Controller 51, to the second Polarization Controller
52 piezoelectric ceramics input second voltage, the electromagnetism flex effect having using piezoelectric ceramics, to the He of the first Polarization Controller 51
The parameter of fiber optic coils 501 of the second Polarization Controller 52 is finely adjusted, so as to realize the fiber optic coils of the first Polarization Controller 51
The linear polarization output of the fiber optic coils 501 of 501 linear polarization output and the second Polarization Controller 52.
Additionally, voltage output device is input into tertiary voltage to the motor 505 of the first Polarization Controller 51 so that the first polarization
The coil plane deflection first angle of controller 51, now, the first beam treatment that the first Polarization Controller 51 will be input into is the
One linearly polarized light.Correspondingly, voltage output device is input into the 4th voltage to the motor 505 of the second Polarization Controller 52 so that the
The coil plane deflection second angle of two Polarization Controllers 52, now, at the second light beam that the second Polarization Controller 52 will be input into
It is the second linearly polarized light to manage, and causes that the polarization direction of the first linearly polarized light and second linearly polarized light is mutually orthogonal.Wherein,
First voltage, second voltage, tertiary voltage and the 4th voltage are arranged as required to.
In the present embodiment, the first Polarization Controller 51 and the second Polarization Controller 52 are using above-mentioned fiber optic coils polarization control
Device processed 50 compared to existing Polarization Controller, by motor 505 is set and piezoelectric ceramics can effectively improve polarization state and
The control accuracy of polarization direction, is conducive to improving the signal to noise ratio of the distributed fiber-optic sensor monitoring system 1 that the present embodiment is provided.
Certainly, in addition to above-mentioned fiber optic coils Polarization Controller 50, the first Polarization Controller 51 and the second Polarization Controller
52 can also use quarter wave plate, the combination of quarter wave plate and 1/2 wave plate or other Polarization Control devices.
Further, the first interference modulations device 61 receives the first linearly polarized light exported by the first Polarization Controller 51,
First linearly polarized light is modulated to the first interference signal and is exported to demodulating equipment 70.Second interference modulations device 62 is received by
Second linearly polarized light of the output of two Polarization Controller 52, is modulated to the second linearly polarized light the second interference signal and exports to demodulation
Device 70.
Demodulating equipment 70 is used for the first interference signal and the second interference modulations dress to the output of the first interference modulations device 61
The second interference signal for putting 62 outputs is demodulated and obtains transducing signal.
The utility model embodiment mainly provides two kinds of demodulation modes, and two kinds of demodulation modes correspond respectively to interference modulations
Two kinds of specific embodiments of device and demodulating equipment 70.Below by respectively to the fiber distribution under both specific embodiments
Formula sensing and monitoring system 1 is described.
As a kind of specific embodiment, as shown in fig. 6, the first interference modulations device 61 includes the first fibre optic interferometer,
Second interference modulations device 62 includes the second fibre optic interferometer, and demodulating equipment 70 includes the first polarization beam combiner 701, the first photoelectricity
Detector 702 and data processor 703.
The input of the first fibre optic interferometer is coupled with the output end of the first Polarization Controller 51, the second fibre optic interferometer
Input is coupled with the output end of second Polarization Controller 52, the output end of the first fibre optic interferometer and the second fiber optic interferometric
Input of the output end of instrument with the first polarization beam combiner 701 is coupled, output end and first light of the first polarization beam combiner 701
The input coupling of electric explorer 702, the output end of the first photodetector 702 is electrically connected with data processor 703.
In the present embodiment, the first fibre optic interferometer and the second fibre optic interferometer are both preferably Michelson fiber-optic interferometer.
First fibre optic interferometer includes the one 2 × 2nd coupler, first phase modulator, the first faraday rotation mirror and the
Two faraday rotation mirrors.Second fibre optic interferometer includes the 22 × 2nd coupler, second phase modulator, the 3rd Faraday rotation
Mirror and the 4th faraday rotation mirror.
As shown in fig. 6, the laser of super-narrow line width laser output enters into acousto-optic modulator, will even by acousto-optic modulator
Continuous Laser Modulation is τ into pulse, and the cycle is the pulse laser of T, and pulse laser sequentially passes through the first image intensifer and ultra-narrow
Flashlight is formed after the optical filter of line width first.Flashlight is into the C11 ends of first annular device 20, by first annular device 20
C13 ends injection length is the sensor fibre 30 of Y.The back rayleigh scattering light that transducing signal is carried in sensor fibre 30 returns to the
The C13 ends of one circulator 20, export through the C12 ends of first annular device 20, sequentially pass through the second image intensifer, super-narrow line width second
Optical filter enters the E31 ends of beam splitter 40.Through the beam splitting of beam splitter 40 be the first light beam and the second light beam, the first light beam by
The first beam splitting end E32 ends output of beam splitter 40 enters into the Q11 ends of the first Polarization Controller 51, and the second light beam is divided by with light
The second beam splitting end E33 outputs of beam device 40 enter into the Q21 ends of the second Polarization Controller 52.
First linearly polarized light of the Q12 ends output of the first Polarization Controller 51 enters into the E11 ends of the one 2 × 2nd coupler,
After through the one 2 × 2nd coupler light splitting, the light of the one 2 × 2nd coupler E13 ends output is by length for the optical fiber of L1 enters into the
One faraday rotation mirror.The light of the one 2 × 2nd coupler E14 ends output enters into the second faraday by first phase modulator
Revolving mirror.Connection first phase modulator and the second faraday rotation mirror be length be L2 optical fiber, wherein, L1>L2, and
L1-L2=S.Two-beam returns to the one 2 × 2nd coupling through the first faraday rotation mirror and the reflection of the second faraday rotation mirror respectively
Interfere to form the first interference signal at device, the first interference signal enters into the first polarization through the one 2 × 2nd coupler E12 ends
The P41 ends of bundling device 701.
Second linearly polarized light of the Q22 ends output of the second Polarization Controller 52 enters into the E21 ends of the 22 × 2nd coupler,
After through the 22 × 2nd coupler light splitting, the light of the 22 × 2nd coupler E23 ends output is by length for the optical fiber of L1 enters into the
Three faraday rotation mirrors, the light of the 22 × 2nd coupler E24 ends output enters into the 4th faraday by second phase modulator
Revolving mirror.Connection second phase modulator and the 4th faraday rotation mirror be fiber lengths be L2 optical fiber, wherein, L1-L2
=S.Two-beam is returned at the 22 × 2nd coupler through the 3rd faraday rotation mirror and the reflection of the 4th faraday rotation mirror respectively
Interfere to form the second interference signal.Second interference signal enters into the first polarization coupling through the 22 × 2nd coupler E22 ends
The P42 ends of device 701.In the process, the phase carrier signal F5 of voltage output device 80 is to first phase modulator and the second phase
Position modulator carries out carrier modulation.
Enter the second interference signal from the first interference signal of the P41 ends entrance of the first polarization beam combiner 701 and from P42 ends
Total interference signal is formed after closing beam through the first polarization beam combiner 701.Total interference signal by the first polarization beam combiner 701 P43 ends
Enter into the first photodetector 702.First photodetector 702 will close the first interference signal and the second interference signal after beam
Be converted to electric signal output to data processor 703, carry out phase carrier demodulation (Phase Generated Carrier,
PGC), corresponding transducing signal is demodulated.Wherein, phase carrier demodulation can be realized by hardware, it is also possible to by software reality
Existing, when being realized by hardware, data processor 703 can be with integrated circuit modules, when being realized by software, data processor
703 can be computer or the chip with data processing function.
According to the light intensity magnitude that the first photodetector 702 is detected, data processor 703 can be exported with control voltage and filled
Put 80 and send the piezoelectric ceramics that electric signal F1 controls the second Polarization Controller 52, send electric signal F3 and control the first Polarization Controller
51 piezoelectric ceramics, to realize the output of the first linearly polarized light and the second linearly polarized light.Additionally, data processor 703 can be controlled
Voltage output device processed 80 sends the motor 505 that electric signal F2 controls the first Polarization Controller 51, sends electric signal F4 controls the
The motor 505 of two Polarization Controllers 52, to adjust the polarization direction of the first linearly polarized light and the second linearly polarized light respectively so that the
The polarization direction of one linearly polarized light and the second linearly polarized light is mutually orthogonal.
Fig. 7 shows the module frame chart of the phase carrier demodulating algorithm used in the present embodiment.As shown in fig. 7, detector
Signal is multiplied in the first multiplier with fundamental frequency signal and enters into the first low pass filter, and signal delivers to the first differentiator, with second
Signal multiplication after LPF, enters into subtracter one end, and subtraction is carried out with the signal after the 4th multiplier；Detection
Device signal is multiplied in the second multiplier with frequency-doubled signal and enters into the second low pass filter, and signal delivers to the second differentiator, with
Signal multiplication after one LPF, enters into subtracter one end, and subtraction is carried out with the signal after the 3rd multiplier；Two
Road signal sends into subtracter simultaneously, after sending into integrator, high-pass filter after computing, demodulates transducing signal.
According to the relevant principle of light, the light intensity I that the first photodetector 702 is received is represented by：
I=A+Bcos Φ (t) (3)
In formula (3), A is the average light power of above-mentioned total interference signal, and B is above-mentioned total interference signal amplitude, B=κ A, κ≤
1 is visibility of interference fringes.Φ (t) is the phase difference of total interference signal.If Then formula (3) is writeable
For：
In formula (4), Ccos ω0T is phase carrier, and C is amplitude, ω0It is carrier frequency；
When transducing signal is acoustic field signal, Dcos ωsT is the phase place change that the acoustic field signal that sensor fibre 30 is sensed causes.Its
In, D is amplitude, ωsIt is acoustic field signal frequency, Ψ (t) is the slowly varying of the initial phase that environmental perturbation etc. causes.By formula
(4) obtained with Bessel functional expansions：
In formula (5), JnM () represents the n rank Bessel functional values under m modulation depths.As shown in fig. 7, phase carrier is modulated
Schematic diagram by the use of the signal I after Bessel functional expansions as detector signal, respectively with fundamental frequency signal (amplitude is G), two times
Frequency signal (amplitude is H) is multiplied.For the blanking for overcoming signal to occur with the fluctuation of outside interference signal and distortion phenomenon,
Differential multiplication cross (DCM) has been carried out to two paths of signals, the signal after differential multiplication cross by differential amplification, integral operation at
Be converted to after reason：
WillSubstitution formula (6) has：
B2GHJ1(C)J2(C)[Dcosωst+Ψ(t)] (7)
From formula (7), the signal obtained after integration contains measured signal Dcos ωsT and the environmental information in the external world.Afterwards
Person is typically a slow varying signal, and amplitude can be very big, can be filtered by high-pass filter, and the last of system is output as
B2GHJ1(C)J2(C)Dcosωst (8)
The phase place change that the acoustic field signal i.e. transducing signal that sensor fibre 30 senses causes can be solved by formula (8)
DcosωsT signals.
As another specific embodiment, as shown in figure 8, the first interference modulations device 61 include the second photo-coupler and
First fibre optic interferometer, the second interference modulations device 62 includes the 3rd photo-coupler and the second fibre optic interferometer.Demodulating equipment 70
Including the first polarization beam combiner 711, the second polarization beam combiner 712, the 3rd polarization beam combiner 713, the first photodetector 721,
Second photodetector 722, the 3rd photodetector 723 and data processor 730.
In the present embodiment, the first fibre optic interferometer includes the one 3 × 3rd coupler 611, the first faraday rotation mirror and second
Faraday rotation mirror, the 3rd faraday rotation mirror and the 4th faraday rotation mirror.Second photo-coupler can be the second circulator
610, the 3rd photo-coupler can be the 3rd circulator 620.
Now, the difference with above-mentioned implementation method is, the First Line of the Q12 ends output of the first Polarization Controller 51
Polarised light through the C21 ends and C23 ends of the second circulator 610, enters into the B11 ends of the one 3 × 3rd coupler 611 successively, by
The beam splitting of one 3 × 3 coupler 611, the light exported from the B14 ends of the one 3 × 3rd coupler 611 is the optical fiber entrance of L1 by length
To the first faraday rotation mirror, entered into by the optical fiber that length is L2 from the light of the B15 ends output of the one 3 × 3rd coupler 611
Second faraday rotation mirror, wherein, L1-L2=S.Two-beam is respectively through the first faraday rotation mirror and the second faraday rotation mirror
Reflection returns to and interferes to form the first interference signal at the one 3 × 3rd coupler 611.First interference signal is divided into three-beam,
Light beam enters into the C23 of the second circulator 610 by the B11 ends of the one 3 × 3rd coupler 611, through the second circulator 610
C22 ends enter into the P11 ends of the first polarization beam combiner 711, the second beam light enters through the B12 ends of the one 3 × 3rd coupler 611
To the P21 ends of the second polarization beam combiner 712, three-beam enters into the 3rd polarization and closes through the B13 ends of the one 3 × 3rd coupler 611
The P31 ends of beam device 713.
Second Polarization Controller 52 Q22 ends output the second linearly polarized light successively through the 3rd circulator 620 C31 ends and
C33 ends enter into the B21 ends of the 23 × 3rd coupler 621, by the beam splitting of the 23 × 3rd coupler 621, from the 23 × 3rd coupling
The light of the B24 ends output of device 621 enters into the 3rd faraday rotation mirror by the optical fiber that length is L1, from the 23 × 3rd coupler
The light of 621 B25 ends output enters into the 4th faraday rotation mirror by the optical fiber that length is L2, wherein, L1-L2=S, two beams
Light is returned at the 23 × 3rd coupler 621 through the 3rd faraday rotation mirror and the reflection of the 4th faraday rotation mirror respectively to be occurred to do
Relate to form the second interference signal.Second interference signal is also classified into three-beam, and light beam is by the 23 × 3rd coupler 621
B21 ends are exported to the C33 ends of the 3rd circulator 620, and the first polarization beam combiner is entered into by the C32 ends of the 3rd circulator 620
711 P12 ends；Second beam light enters into the P22 of the second polarization beam combiner 712 by the B22 ends of the 23 × 3rd coupler 621
End；Three-beam enters into the P32 ends of the 3rd polarization beam combiner 713 by the B23 ends of the 23 × 3rd coupler 621.
It is input into the P11 ends of the first polarization beam combiner 711 and the light at P12 ends and closes Shu Houjing P13 in the first polarization beam combiner 711
End enters into the first photodetector 721, is converted to the first electric signal through the first photodetector 721 and is input into data processor
730.The P21 ends of the second polarization beam combiner 712 and the light at P22 ends is input into enter at the conjunction Shu Houjing P23 of the second polarization beam combiner 712 ends
Enter to be converted to the second electric signal to the second photodetector 722, through the second photodetector 722 and be input into data processor 730.
The P31 ends of the 3rd polarization beam combiner 713 and the light at P32 ends is input into be entered at the conjunction Shu Houjing P33 of the 3rd polarization beam combiner 713 ends
3rd photodetector 723, be converted to the 3rd electric signal through the 3rd photodetector 723 and be input into data processor 730.First
Electric signal, the second electric signal and the 3rd electric signal send into data processor 730 and carry out the demodulation of 3 × 3 coupler algorithms, demodulation simultaneously
Go out corresponding transducing signal.
According to the light intensity that the first photodetector 721, the second photodetector 722, the 3rd photodetector 723 are received
Size, data processor 730 can send electric signal F6, F8 and control the first Polarization Controller respectively with control voltage output device 80
51 and second Polarization Controller 52 piezoelectric ceramics, to realize the output of the first linearly polarized light and the second linearly polarized light.Additionally, number
Can send electric signal F7 and F9 with control voltage output device 80 according to processor 730 controls the first Polarization Controller 51 and second inclined
Shake the motor 505 of controller 52, to adjust the polarization direction of the first linearly polarized light and the second linearly polarized light respectively so that First Line
The polarization direction of polarised light and the second linearly polarized light is mutually orthogonal.
It should be noted that the present embodiment is preferably using 3 × 3 coupler demodulation algorithms after improving.After improvement 3 × 3
Coupler demodulation algorithm can effectively improve because 3 × 3 coupler angles have asking for the distortion of errors cause phase demodulation
Topic, its demodulation principle is as follows：
Wherein, A, B, C represent the three tunnels output of 3 × 3 couplers respectively, wherein, D is direct current signal, I0It is signal amplitude,It is transducing signal, θ is the angle of 3 × 3 couplers.
Formula (9) (10) (11) can be written as：
The formula of obtaining (13) can further be solved according to formula (12)：
In formula (13), T is the matrix of the angle on coupler,Can be with by formula (13)
Find out,120 degree that ask for not relied on common 3 × 3 coupler.
Further, as shown in figure 9, signal A and signal B is carried out by differentiator micro- as shown in formula (14) and formula (15)
Manage office.
Then, then by by the signal after differential process by subtracter, enter the subtraction process shown in line (16)：
Meanwhile, signal A and signal B are sequentially passed through into squarer, adder treatment and is obtained：
Further, by formula (16) divided by formula (17) after, then can just be drawn by the Integral Processing of integrator
In sum, the distributed fiber-optic sensor monitoring system 1 that the utility model embodiment is provided, by beam splitter 40
It is the first light beam and the second light beam that the back rayleigh scattering light for carrying transducing signal is split, by the first Polarization Controller
51 and second Polarization Controller 52 respectively by the first light beam and the second beam treatment for polarization direction meets the first of preset relation
Linearly polarized light and the second linearly polarized light.Respectively by the first interference modulations device 61 and the second interference modulations device 62 to First Line
Polarised light and the second linearly polarized light carry out interference modulations, then the demodulation output of the first interference modulations device 61 of demodulated device 70 the
One interference signal and the second interference signal of the output of the second interference modulations device 62 obtain corresponding transducing signal, can be as far as possible
Ground ensures that transducing signal is not lost, and is effectively improved the signal to noise ratio of distributed fiber-optic sensor monitoring system 1.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be described with power
The protection domain that profit is required is defined.
Claims (10)
1. a kind of distributed fiber-optic sensor monitoring system, it is characterised in that including signal light generating device, the first photo-coupler,
Sensor fibre, beam splitter, the first Polarization Controller, the second Polarization Controller, the first interference modulations device, the second interference modulations
Device and demodulating equipment, the sensor fibre are used to sense transducing signal；
The flashlight that the signal light generating device is produced is input into the sensor fibre by first photo-coupler；
The back rayleigh scattering light of the carrying transducing signal in the sensor fibre returns to first photo-coupler, through institute
State the first photo-coupler and be input into the beam splitter, the first light beam and the second light beam, described first are divided into through the beam splitter
Light beam is processed as inciding the first interference modulations device after the first linearly polarized light through first Polarization Controller, and described
Two light beams also incide the second interference modulations device after being processed as the second linearly polarized light through second Polarization Controller, its
In, the polarization direction of first linearly polarized light and second linearly polarized light meets preset relation；
The demodulating equipment is used to adjust the first interference signal of the first interference modulations device output and second interference
Second interference signal of device output processed is demodulated to obtain the transducing signal.
2. distributed fiber-optic sensor monitoring system according to claim 1, it is characterised in that first Polarization Controller
Fiber optic coils Polarization Controller is with second Polarization Controller, the fiber optic coils Polarization Controller includes being wound in cylinder
The fiber optic coils of the outer wall of shape piezoelectric ceramics；
The input of the fiber optic coils of first Polarization Controller is coupled with the first beam splitting end of the beam splitter, and described
The output end of the fiber optic coils of one Polarization Controller is coupled with the demodulating equipment, the fiber optic coils of second Polarization Controller
Input coupled with the second beam splitting end of the beam splitter, the output end of the fiber optic coils of second Polarization Controller with
The demodulating equipment coupling；
The system also includes voltage output device, the tubular piezoelectric ceramics of first Polarization Controller, second polarization
The tubular piezoelectric ceramics and the demodulating equipment of controller are electrically connected with the voltage output device.
3. distributed fiber-optic sensor monitoring system according to claim 2, it is characterised in that the fiber optic coils are λ/4
Fiber optic coils.
4. distributed fiber-optic sensor monitoring system according to claim 3, it is characterised in that the fiber optic coils polarization control
Device processed also includes the first housing, and the fiber optic coils of the outer wall for being wound in tubular piezoelectric ceramics are packaged in first housing
It is interior.
5. distributed fiber-optic sensor monitoring system according to claim 4, it is characterised in that the fiber optic coils polarization control
Device processed also includes motor and power transmission shaft, and the rotating shaft of the motor is connected with the power transmission shaft, and the motor passes through the power transmission shaft
It is connected with the rotation connector for being arranged at first housing bottom, the motor of first Polarization Controller is inclined with described second
The motor of controller of shaking is electrically connected with the voltage output device；
The motor of first Polarization Controller is used to drive the fiber optic coils of first Polarization Controller to be rotated such that this
Fiber optic coils export first linearly polarized light；
The motor of second Polarization Controller is used to drive the fiber optic coils of second Polarization Controller to be rotated such that this
Fiber optic coils export second linearly polarized light.
6. distributed fiber-optic sensor monitoring system according to claim 5, it is characterised in that the fiber optic coils polarization control
Device processed also includes the second housing, is packaged with first housing of the fiber optic coils of the outer wall for being wound in tubular piezoelectric ceramics
It is arranged in the second shell body, second housing is provided with the first opening, the second opening and the 3rd opening, and described first opens
For penetrating the power transmission shaft, described second is open mouth enter line, the 3rd opening for passing the coil of the fiber optic coils
Coil outlet for passing the fiber optic coils.
7. distributed fiber-optic sensor monitoring system according to claim 1, it is characterised in that first linearly polarized light and
The polarization direction of second linearly polarized light is mutually orthogonal.
8. the distributed fiber-optic sensor monitoring system according to any one of claim 1-7, it is characterised in that described first
Interference modulations device includes the first fibre optic interferometer, and the second interference modulations device includes the second fibre optic interferometer, the solution
Adjusting device includes the first polarization beam combiner, the first photodetector and data processor, the input of first fibre optic interferometer
End is coupled with the output end of first Polarization Controller, and the input of second fibre optic interferometer and the described second polarization are controlled
The output end coupling of device processed, the output end of the output end of first fibre optic interferometer and second fibre optic interferometer is and institute
State the input coupling of the first polarization beam combiner, the output end of first polarization beam combiner and first photodetector
Input is coupled, and the output end of first photodetector is electrically connected with the data processor；
First linearly polarized light is described into the first interference signal is formed after the interference treatment of first fibre optic interferometer
Second linearly polarized light forms the second interference signal, first interference signal after the interference treatment of second fibre optic interferometer
Enter first polarization beam combiner with second interference signal, passed through after being processed through the conjunction beam of first polarization beam combiner
First photodetector is converted to electric signal into the data processor, and the data processor is used to process the electricity
Signal obtains the transducing signal.
9. distributed fiber-optic sensor monitoring system according to claim 8, it is characterised in that the first interference modulations dress
Putting also includes the second photo-coupler, and the second interference modulations device also includes the 3rd photo-coupler, and the demodulating equipment is also wrapped
The second polarization beam combiner, the 3rd polarization beam combiner, the second photodetector and the 3rd photodetector are included, first optical fiber is done
Interferometer includes the one 3 × 3rd coupler, and second fibre optic interferometer includes the 23 × 3rd coupler；
The output end of first Polarization Controller is coupled with the first port of second photo-coupler, second optical coupling
The second port of device is coupled with the first port of the one 3 × 3rd coupler, the 3rd port of second photo-coupler and institute
State the input coupling of the first polarization beam combiner, second port and second polarization beam combiner of the one 3 × 3rd coupler
Input coupling, the 3rd port of the one 3 × 3rd coupler couples with the input of the 3rd polarization beam combiner；
The output end of second Polarization Controller is coupled with the first port of the 3rd photo-coupler, the 3rd optical coupling
The second port of device is coupled with the first port of the 23 × 3rd coupler, the 3rd port of the 3rd photo-coupler and institute
State the input coupling of the first polarization beam combiner, second port and second polarization beam combiner of the 23 × 3rd coupler
Input coupling, the 3rd port of the 23 × 3rd coupler couples with the input of the 3rd polarization beam combiner；
The output end of second polarization beam combiner is coupled with the input of second photodetector, and the 3rd polarization is closed
The output end of beam device is coupled with the input of the 3rd photodetector, the output end of second photodetector with it is described
The output end of the 3rd photodetector is electrically connected with the data processor.
10. distributed fiber-optic sensor monitoring system according to claim 9, it is characterised in that first fiber optic interferometric
Instrument and second fibre optic interferometer are Michelson fiber-optic interferometer.
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| CN201621320403.5U CN206292019U (en) | 2016-12-02 | 2016-12-02 | Distributed fiber-optic sensor monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525362A (en) * | 2016-12-02 | 2017-03-22 | 山东省科学院激光研究所 | Fiber optic distributed sensing monitoring system |
| CN114993448A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
| CN117192313A (en) * | 2023-11-08 | 2023-12-08 | 国网天津市电力公司电力科学研究院 | Optical fiber sensing system for detecting partial discharge of gas-insulated switchgear |
-
2016
- 2016-12-02 CN CN201621320403.5U patent/CN206292019U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525362A (en) * | 2016-12-02 | 2017-03-22 | 山东省科学院激光研究所 | Fiber optic distributed sensing monitoring system |
| CN106525362B (en) * | 2016-12-02 | 2019-07-26 | 山东省科学院激光研究所 | Distributed fiber-optic sensor monitors system |
| CN114993448A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
| CN114993448B (en) * | 2022-06-09 | 2023-04-07 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
| CN117192313A (en) * | 2023-11-08 | 2023-12-08 | 国网天津市电力公司电力科学研究院 | Optical fiber sensing system for detecting partial discharge of gas-insulated switchgear |
| CN117192313B (en) * | 2023-11-08 | 2024-02-27 | 国网天津市电力公司电力科学研究院 | Optical fiber sensing system for detecting partial discharge of gas-insulated switchgear |
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