CN207515951U - Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating - Google Patents
Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating Download PDFInfo
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Abstract
The utility model discloses a distributed hydraulic pressure sensor system based on brillouin developments grating, include: a hydraulic pipeline to be tested; the system comprises a sensing optical fiber on the inner wall of a pipeline, a distributed hydraulic sensor for detecting the birefringence frequency shift of the sensing optical fiber and an upper computer; the distributed hydraulic sensor and the upper computer are respectively positioned outside the pipeline; the hydraulic pressure sensor includes: the optical path component is used for generating the Brillouin dynamic grating in the sensing optical fiber and reading the Brillouin dynamic grating; the photoelectric detector is a data acquisition system for acquiring the electric signal of the photoelectric detector; the hydraulic sensor transmits acquired data to the upper computer through the data acquisition system, and the upper computer obtains the hydraulic pressure in the pipeline where the sensing optical fiber is located according to the corresponding relation between the birefringence frequency shift and the hydraulic pressure. The hydraulic sensor can be used for accurately measuring hydraulic pressure in an oil-gas pipeline, can realize distributed measurement with high spatial resolution smaller than 1m, and can be applied to occasions such as large-scale oil tanks and oil-gas pipeline hydraulic measurement.
Description
Technical field
The utility model relates to distributed Brillouin's dynamic raster sensing technologies, and in particular to one kind is based on Brillouin
The distributed hydrostatic sensor system of dynamic raster.
Background technology
In recent years, with the high speed development of petroleum industry, petroleum resources demand is for a long time in the situation of rapid growth.Together
When, due to China's petroleum resources spatial distribution is uneven, imported crude oil amount is continuously increased, China's oil-gas pipeline engineering is built
If quickly growing, carry out oil-gas pipeline quantity this year and be continuously increased.Therefore, the safety monitoring of oil-gas pipeline is increasingly closed by all circles
Note.
The hydraulic pressure of oil-gas pipeline is one of pipeline important safety parameter.And it is traditionally used for the electronic component of hydraulic pressure measure
Corrosion resistance is poor, there is the danger for causing fire, exploding again in oil storage application scenario.Meanwhile electric sensor generally needs
Local instrument is wanted, is not suitable for disposing array in deep water or oil well.And Distributed Optical Fiber Sensing Techniques can make up above-mentioned electricity
The deficiency of hydrostatic sensor with high sensitivity, not by electromagnetic interference, compact structure, is easy to networking etc., can particularly answer
In the rugged environments such as inflammable and explosive, high temperature, strong electromagnetic, extensive chemical corrosion, therefore in petroleum industry (particularly oil
Feed channel) in, development prospect is very huge.
Wherein, its major function of the distributed sensing based on Brillouin scattering is to utilize Brillouin shift (Brillouin scattering
Optical frequency difference between light and Rayleigh scattering light) temperature, the linear sensibility of strain, can realize over long distances, high-precision temperature
Degree and strain sensing.However, traditional brillouin distributed sensor-based system is for transverse pressure and does not have sensibility, therefore
It cannot be used for such as the occasion of oil-gas pipeline hydraulic measurement.And it is other for measuring the technological means of hydraulic pressure, such as high birefringence light
Grid can not achieve distributed measurement using Sagnac rings of high birefringence optical fiber etc..Meanwhile it is generally basede on Brillouin scattering effect
The sensor answered is due to the limitation of phonon lifetime (about 10ns), it is impossible to realize the measurement of the high spatial resolution of below 1m.
Utility model content
(1) technical problems to be solved
In order to which existing sensing technology is overcome to can not achieve safe long-distance distributed measurement hydraulic pressure (such as larger hydrocarbon
Transport pipeline oil pressure measures) the problem of, the utility model provides a kind of distributed hydraulic sensing based on Brillouin's dynamic raster
Device system, the hydrostatic sensor can be used in accurately measuring hydraulic pressure in oil-gas pipeline, can also realize the high spatial point less than 1m
Resolution distributed measurement can be applied to the occasions such as large oil tank, oil-gas pipeline hydraulic measurement.
(2) technical solution
The utility model provides a kind of distributed hydrostatic sensor system based on Brillouin's dynamic raster, including：
The pipeline of hydraulic pressure to be measured；The sensor fibre being laid with inside pipeline, the sensor fibre are close to the inner wall of the pipe paving
If；
The distributed hydrostatic sensor of birefringence frequency displacement based on Brillouin's dynamic raster principle detection sensor fibre, connection
The host computer of distributed hydrostatic sensor；
The distribution hydrostatic sensor, host computer are located on the outside of pipeline respectively；
The hydrostatic sensor includes：For generating the light path element of Brillouin's dynamic raster in sensor fibre and being used for
Read the light path element of Brillouin's dynamic raster；And the optical signal reflected from Brillouin's dynamic raster is converted into electric signal
Photodetector acquires the data collecting system of the electric signal of photodetector；
The data of acquisition are transmitted in host computer by the hydrostatic sensor by data collecting system, the host computer root
According to birefringence frequency displacement and the correspondence of hydraulic pressure, the hydraulic pressure where obtaining sensor fibre in pipeline.
Optionally, the sensor fibre is side-hole fiber；The birefringence frequency displacement of the side-hole fiber is 40-60GHz；
The center of circle of two airports of the side-hole fiber and the fibre core of doping silicon dioxide is point-blank, and each
The distance between a diameter of 30-10um of airport, a diameter of 8-10um of the fibre core, two airport centers are 40-50um.
Optionally, the distributed hydrostatic sensor includes：
First laser device, photo-coupler, the first electrooptic modulator, the second electrooptic modulator, the first isolator, the first er-doped
Fiber amplifier, the first Polarization Controller, sensor fibre；
Third electrooptic modulator, the second isolator, the second erbium-doped fiber amplifier, the second Polarization Controller, polarization beam splitting
Device；
Second laser, acousto-optic modulator, third erbium-doped fiber amplifier, third Polarization Controller, optical circulator；
Wherein, the output terminal of the input terminal connection first laser device of photo-coupler；The first via of the photo-coupler output
Pump light signals are modulated into first via pulsed optical signals via the first electrooptic modulator and the second electrooptic modulator, by first every
The first erbium-doped fiber amplifier is entered from device, first erbium-doped fiber amplifier puts the power of first via pulsed optical signals
Greatly to the power that can excite Brillouin's dynamic raster；First via pulsed optical signals after amplifying power pass through the first Polarization Control
Device so that the polarization states of the first via pulsed optical signals after the amplifying power position parallel with the fast axle of sensor fibre；
Second tunnel pump light signals of the photo-coupler output are modulated into the second tunnel pulse via third electrooptic modulator
Optical signal enters the second erbium-doped fiber amplifier by the second isolator, and second erbium-doped fiber amplifier is by the second tunnel
The power amplification of pulsed optical signals is to the power that can excite Brillouin's dynamic raster；First via pulsed light letter after amplifying power
Number pass through the second Polarization Controller so that the polarization state of first via pulsed optical signals and the fast axle of sensor fibre after amplifying power
Parallel position；
The input terminal of the sensor fibre connects first Polarization Controller, the output terminal of the sensor fibre and described
The output terminal of second Polarization Controller connects the input terminal of polarization beam apparatus respectively, via the first via arteries and veins of the polarization beam apparatus
Pulsed light signal and the second road pulsed optical signals generation position and broad-adjustable Brillouin's dynamic raster in sensor fibre；
The output of the input terminal connection second laser of acousto-optic modulator, and modulated pulse detection light is exported via the
Three erbium-doped fiber amplifiers are input to third Polarization Controller, wherein, third erbium-doped fiber amplifier is by the work(of pulse detection light
Rate is amplified to the power that can read Brillouin's dynamic raster, and the third Polarization Controller is by the pulse detection after power amplification
The polarization state of light is adjusted to the position parallel with the slow axis of sensor fibre；
Pulse detection light via the third Polarization Controller enters sensing by the optical circulator, polarization beam apparatus
After optical fiber, after being reflected by Brillouin's dynamic raster, into photodetector,
The electric signal of the data collecting system acquisition photodetector, and it is transmitted to host computer.
Optionally, the distributed hydrostatic sensor further includes, microwave signal generator and pulse signal generator；
The microwave signal 11GHz that the microwave signal generator generates drives the second electrooptic modulator；
The pulse signal that pulse signal generator generates respectively drives the first electrooptic modulator, third electrooptic modulator harmony
Optical modulator；
Wherein, the pulse signal generator generate for drive the rising edge of the pulse signal of acousto-optic modulator when
Between point with pulse signal generator generate for drive the first electrooptic modulator pulse signal rising edge time point it
Between time difference be less than phonon service life.
Optionally, the distributed hydrostatic sensor further includes, pulse signal generator；
The pulse signal that pulse signal generator generates respectively drives the first electrooptic modulator, third electrooptic modulator harmony
Optical modulator.
Optionally, the laser frequency for detection that the second laser generates is used to produce than what first laser device generated
The low birefringence frequency displacement 40-60GHz of laser frequency of raw Brillouin's dynamic raster.
Optionally, the pipeline of hydraulic pressure to be measured is oil-gas pipeline.
Optionally, the pulsewidth of two pumping pulse light corresponding with first laser device is 2ns~100ns.
Optionally, the pulsewidth of the pulse detection light is 2ns~100ns.
Optionally, pulse detection light lags the pumping pulse light 1ns~10ns in time.
(3) advantageous effect
The beneficial effects of the utility model are that distributed hydrostatic sensor system can safely be applied to oil gas oil well etc.
Occasion, hydraulic pressure caused by measuring pipeline oil and gas leakage or blocking changes, and while hydraulic pressure accurately measures, realizes spatial resolution
Distributed measurement less than 1m.
Description of the drawings
Fig. 1 is the schematic diagram of the distributed hydrostatic sensor system based on Brillouin's dynamic raster of the utility model；
Fig. 2 is the sectional view of side-hole fiber；
Fig. 3 is the schematic diagram of pumping pulse light and direct impulse optical signal.
【Reference sign】
First laser device 1, photo-coupler 2, the first electrooptic modulator 3, the second electrooptic modulator 4, microwave signal generator
5th, the first isolator 6, the first erbium-doped fiber amplifier 7, the first Polarization Controller 8, sensor fibre 9；
Third electrooptic modulator 10, the second isolator 11, the second erbium-doped fiber amplifier 12, the second Polarization Controller 13,
Polarization beam apparatus 14, second laser 15, acousto-optic modulator 16, pulse signal generator 17, third erbium-doped fiber amplifier 18,
Third Polarization Controller 19, optical circulator 20, photodetector 21, data collecting system 22.
Specific embodiment
It is below in conjunction with the accompanying drawings, right by specific embodiment in order to understand in order to preferably explain the utility model
The utility model is described in detail.
Embodiment one
The distributed hydrostatic sensor system of the present embodiment is to be applied using high birefringence optical fiber as sensing element
In distributed hydraulic measurement environment (particularly oil-gas pipeline), can high spatial resolution accurately measure distributed hydraulic pressure.
Specifically, distributed hydrostatic sensor system includes：The pipeline of hydraulic pressure to be measured；The sense light being laid with inside pipeline
Fibre, the sensor fibre are close to the inner wall of the pipe and are laid with；
Based on Brillouin's dynamic raster principle, (the distributed hydraulic pressure based on Brillouin's dynamic raster in such as the present embodiment passes
Sensor system) detection sensor fibre birefringence frequency displacement distributed hydrostatic sensor, connect the upper of distributed hydrostatic sensor
Position machine；
The distribution hydrostatic sensor, host computer are located on the outside of pipeline respectively；
The hydrostatic sensor includes：For generating the light path element of Brillouin's dynamic raster in sensor fibre and being used for
Read the light path element of Brillouin's dynamic raster；And the optical signal reflected from Brillouin's dynamic raster is converted into electric signal
Photodetector acquires the data collecting system of the electric signal of photodetector；
The data of acquisition are transmitted in host computer by the hydrostatic sensor by data collecting system, the host computer root
According to birefringence frequency displacement and the correspondence of hydraulic pressure, the hydraulic pressure of pipeline where obtaining sensor fibre.
Above-mentioned distribution fluid sensing systerm, comprising the light path in two orthogonal polarization orientations, is respectively used to Brillouin and moves
The generation and reading of state grating.It is specific as follows：
It is all the way wherein x directions, for generating Brillouin's dynamic raster.The laser that first laser device 1 is sent out passes through optocoupler
Clutch is divided into two-way, for providing pump light：The continuous pump light signals of the first via are modulated into pulsed optical signals, and make it first
Frequency has the frequency displacement of Brillouin shift size relative to another way optical signal, to generate stimulated Brillouin effect.
Powerful first erbium-doped fiber amplifier 7 is used later by optical signal amplification, the first Polarization Controller 8 of recycling
The polarization state of optical signal is transferred in the fast axle of sensor fibre 9.
Second tunnel pump light signals are equally modulated into light pulse signal, later by the second erbium-doped fiber amplifier 12 by light
Signal amplifies, then the polarization state of optical signal is transferred in optical fiber fast axle by the second Polarization Controller 13.Finally, two-way pump light passes through
It crosses polarization beam apparatus 14 to interact, Brillouin's dynamic raster is produced in sensor fibre 9.
In pulse process is generated, by control two pulse pump light delay, can in a fiber any one ground
Side generates Brillouin's dynamic raster, and controls Brillouin's dynamic raster length by controlling the width of light pulse.
Another way is y directions, for reading Brillouin's dynamic raster.The laser frequency that the second laser 15 generates is compared
The low about birefringence frequency displacement (ordinarily being about 40-60GHz) of pump laser, then by acousto-optic modulator 16 by continuous light modulation
For pulsed light.
In an optional implementation manner, two aforementioned electrooptic modulators (such as the first electrooptic modulator 3 and third electricity
Optical modulator 10) all driven by pulse signal generator, with ensure two pulse front edge intervals be less than phonon lifetime, make detection light with
It reflects grating and useful effect occurs.At this point, the pulsed light is introduced into Polarization Controller after third erbium-doped fiber amplifier 18
19, enter sensor fibre 9 using optical circulator 20 and polarization beam apparatus 14, read out Brillouin's dynamic raster.
Finally, telecommunications is converted to by the optical signal that Brillouin's dynamic raster reflects by light is detected by photodetector 21
Number, data are collected using data collecting system 22, processing are further processed in host computer (not shown), so that it may
To obtain corresponding hydraulic sensing information.
Pulse signal generator 17 in the present embodiment can be twin-channel, generate the pulse signal of two-way, and can
To ensure that the forward position interval of two pulses is less than phonon lifetime.
Sensor fibre used in the present embodiment can be side-hole fiber, and cross section is as shown in Figure 2.The side-hole fiber
Birefringence frequency displacement be 40-60GHz；The center of circle of two airports of the side-hole fiber and the fibre core of doping silicon dioxide is one
On straight line, and a diameter of 30-10um of each airport, a diameter of 8-10um of the fibre core, between two airport centers
Distance be 40-50um.In practical applications, the cladding diameter of side-hole fiber can be 125um+-5um.
The introducing of the symmetrical big air lateral opening (i.e. airport) of fibre core or so two makes side-hole fiber with very high two-fold
It penetrates.During measurement, which is layed in inside oil-gas pipeline, and be close to inner wall of the pipe.When hydraulic pressure variation in pipeline (such as
Situations such as oil and gas leakage, blocking), therefore the birefringence of side-hole fiber can also linearly change.By the spy for injecting different frequency
Survey light, it is possible to the light intensity that Brillouin's dynamic raster is reflected back on different frequency position is obtained, it is anti-so as to obtain the Brillouin
Spectrum is penetrated, obtains birefringence frequency displacement.The position of Brillouin's dynamic raster is controlled by controlling the delay between pumping pulse, so that it may
To obtain the birefringence frequency displacement on entire optical fiber, then will be mapped along the birefringence frequency displacement of optical fiber every bit with hydraulic pressure size,
It can realize distributed hydraulic measurement, can realize point of the spatial resolution less than 1m while hydraulic pressure accurately measures
Cloth measures.
In the present embodiment, the delay between two pulse signals can be set directly on pulse signal generator, from
And the delay between pumping pulse is controlled, and then control the position of Brillouin's dynamic raster.
Embodiment two
With reference to the structure chart of distributed fluid sensing systerm shown in FIG. 1, the distributed fluid sensing systerm of the present embodiment
Including：Brillouin's dynamic raster generates part and reads part.
Brillouin's dynamic raster generates part：The laser that first laser device 1 is sent out is divided into two-way by photo-coupler 2, point
It Chan Sheng not two-way pump light.The first via pump light that photo-coupler 2 exports first is modulated into first via arteries and veins by the first electrooptic modulator 3
Pulsed light signal and frequency with Brillouin shift same size is generated by 5 and second electrooptic modulator 4 of microwave signal generator
It moves, to excite stimulated Brillouin effect, the microwave signal which is generated by microwave signal generator 5 is (about
11GHz) drive.
Later, enter the first erbium-doped fiber amplifier 7 by the first optoisolator 6, by the letter of first via pulsed optical signals
To excite Brillouin's dynamic raster, (work(of Brillouin's dynamic raster can be excited by being amplified to enough power for number power amplification
Rate), the first via pulsed optical signals after amplifying power are again adjusted the polarization state of the road pulsed light by the first Polarization Controller 8
To the position parallel with sensor fibre 9 (sensor fibre cross section structure is as shown in Figure 2) fast axle (wherein, sensor fibre using
The high birefringence side-hole fiber that birefringence frequency displacement is about 40-60GHz).
Pump light is modulated to by the second tunnel pump light signals that above-mentioned photo-coupler 2 exports via third electrooptic modulator 10
Pulsed light i.e. the second road pulsed optical signals, the third electrooptic modulator are driven by pulse signal generator 17.Later, second tunnel
It is by the second Polarization Controller 13 that it is inclined after pulsed optical signals are using the second isolator 11, the second erbium-doped fiber amplifier 12
Polarization state is adjusted to the position parallel with the fast axle of sensor fibre 9.
The second above-mentioned erbium-doped fiber amplifier 12 is used for the power amplification of the second road pulsed optical signals to can excite
The power of Brillouin's dynamic raster.
The input terminal of the sensor fibre 9 connects first Polarization Controller 8, the output terminal of the sensor fibre 9 and
The output terminal of second Polarization Controller 13 connects the input terminal of polarization beam apparatus 14 respectively, via the polarization beam apparatus 14
First via pulsed optical signals and the second road pulsed optical signals generation position and broad-adjustable Brillouin in sensor fibre 9 move
State grating.
Read part：The detection light frequency birefringence lower than the frequency of first laser device 1 that second laser 15 generates
Frequency displacement (about 40-60GHz), and pulsed light is modulated by acousto-optic modulator 16.The acousto-optic modulator 16 is equally sent out by pulse signal
Raw device 17 drives, it is expressly noted that its rising edge, which falls behind, is used for longevity of the time pulse signal of modulated pumping light less than phonon
Life, as shown in Figure 3.Later, optical signal is amplified to the power for reading dynamic raster enough by third erbium-doped fiber amplifier 18,
And polarization state is adjusted to the position parallel with 9 slow axis of sensor fibre by third Polarization Controller 19.When the optical signal passes through light
It, can be by Brillouin's dynamic raster reflection (reflected light signal ratio spy after circulator 20, polarization beam apparatus 14 enter sensor fibre 9
Survey the low Brillouin shift of light), into photodetector 21, and finally by data collecting system 22 data are collected upper
It is handled on machine.
It can be regarded as that is, reading part：The output of the input terminal connection second laser 15 of acousto-optic modulator 16,
And export modulated pulse detection light and be input to third Polarization Controller 19 via third erbium-doped fiber amplifier 18, wherein,
Third erbium-doped fiber amplifier 18 by the power amplification of pulse detection light to the power that can read Brillouin's dynamic raster, it is described
The polarization state of pulse detection light after power amplification is adjusted to parallel with the slow axis of sensor fibre 9 by third Polarization Controller 19
Position；
Via the third Polarization Controller 19 pulse detection light by the optical circulator 20, polarization beam apparatus 14 into
After entering sensor fibre 9, after being reflected by Brillouin's dynamic raster, into photodetector 21, data collecting system 22 acquires photoelectricity
The electric signal of detector 21, and it is transmitted to host computer.
In above-mentioned distributed hydrostatic sensor system, detect light and pump light is put down respectively at two main shafts of sensor fibre
Row (i.e. above-mentioned fast axle and slow axis), thus, it is possible to security measurement oil-gas pipeline hydraulic pressure.Is injected separately at sensor fibre both ends
The corresponding pump light of one laser generates Brillouin's dynamic raster, and the detection light of one end injection wherein, to read Brillouin light
Grid.Detection at this just refers to the optical signal that second laser 15 is sent out, by acousto-optic modulator 16, third Erbium-doped fiber amplifier
Device 18, third Polarization Controller 19, optical circulator 20, then into this optical signal all the way of sensor fibre 8.
Wherein, the polarization state of two pulses pump light is parallel with side-hole fiber main shaft；Meanwhile injected pulse detects
Light, and another main shaft of polarization state and side-hole fiber is parallel, to read Brillouin's dynamic raster.
In the present embodiment, side-hole fiber is a kind of polarization maintaining optical fibre as sensor fibre.Polarization maintaining optical fibre is very high due to having
Birefringence, on different main shafts, refractive index is different, with different propagation speed when being propagated so as to cause light along different main shafts
Degree, the fast main shaft of spread speed are known as fast axle, the slow referred to as slow axis of spread speed.
The position of Brillouin's dynamic raster is adjusted by two pump light delay inequalitys, and length is passed through by two pump light pulse-width regulateds
Brillouin's dynamic raster reflectance spectrum is measured, then hydraulic pressure size is mapped with reflectance spectrum frequency displacement, can realize and entirely sense
Distributed hydraulic measurement on optical fiber.When pumping pulse width is less than 1m, spatial resolution can break through phonon lifetime limitation
And less than 1m.
In the present embodiment, the position of Brillouin's grating is determined by the launch time difference between two pump lights, passes through adjusting
This time difference can cause Brillouin light grid any position on entire optical fiber to move.
In general, the length of sensor fibre should ensure that with the pipeline of hydraulic pressure to be measured as length.In Fig. 2, a is fiber core radius,
2a is the core diameter of the silica of solid doping, and diameter is usually 8-10 μm；R is air pore radius, and 2r is straight for airport
Diameter is not the distance between hole and inner wall of the pipe；R is cladding radius, and 2R is cladding diameter；There is no certain ratio between 2r and 2R
Example relationship.
The Brillouin shift of different types of sensor fibre is slightly different, ordinarily is about 11GHz.That is " the signal of reflected light
Frequency is lower about 11GHz " than detection light frequency, identical with Brillouin shift.
Reflected light signal in the present embodiment refers to detect the letter being reflected back after light and the effect of Brillouin's dynamic raster
Number.
Finally it should be noted that：Above-described each embodiment be merely to illustrate the technical solution of the utility model rather than
It is limited；Although the utility model is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art
It should be understood that：It can still modify to the technical solution recorded in previous embodiment or to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution the utility model
The range of each embodiment technical solution.
Claims (10)
1. a kind of distributed hydrostatic sensor system based on Brillouin's dynamic raster, which is characterized in that including：
The pipeline of hydraulic pressure to be measured；The sensor fibre being laid with inside pipeline, the sensor fibre are close to the inner wall of the pipe and are laid with；
The distributed hydrostatic sensor of birefringence frequency displacement based on Brillouin's dynamic raster principle detection sensor fibre, connection distribution
The host computer of formula hydrostatic sensor；
The distribution hydrostatic sensor, host computer are located on the outside of pipeline respectively；
The hydrostatic sensor includes：For generating the light path element of Brillouin's dynamic raster in sensor fibre and for reading
The light path element of Brillouin's dynamic raster；And the optical signal reflected from Brillouin's dynamic raster is converted to the photoelectricity of electric signal
Detector acquires the data collecting system of the electric signal of photodetector；
The data of acquisition are transmitted in host computer by the hydrostatic sensor by data collecting system, and the host computer is according to double
The correspondence of frequency displacement and hydraulic pressure is reflected, the hydraulic pressure where obtaining sensor fibre in pipeline.
2. distribution hydrostatic sensor system according to claim 1, which is characterized in that the sensor fibre is lateral opening light
It is fine；The birefringence frequency displacement of the side-hole fiber is 40-60GHz；
The center of circle of two airports of the side-hole fiber and the fibre core of doping silicon dioxide point-blank, and each air
Bore dia is 30-10um, a diameter of 8-10um of the fibre core, and the distance between two airport centers are 40-50um.
3. distribution hydrostatic sensor system according to claim 1, which is characterized in that the distribution hydrostatic sensor
Including：
First laser device (1), photo-coupler (2), the first electrooptic modulator (3), the second electrooptic modulator (4), the first isolator
(6), the first erbium-doped fiber amplifier (7), the first Polarization Controller (8), sensor fibre (9)；
Third electrooptic modulator (10), the second isolator (11), the second erbium-doped fiber amplifier (12), the second Polarization Controller
(13), polarization beam apparatus (14)；
Second laser (15), acousto-optic modulator (16), third erbium-doped fiber amplifier (18), third Polarization Controller (19),
Optical circulator (20)；
Wherein, the output terminal of the input terminal connection first laser device (1) of photo-coupler (2)；The of the photo-coupler (2) output
Pump light signals are modulated into first via pulsed optical signals via the first electrooptic modulator (3) and the second electrooptic modulator (4) all the way,
The first erbium-doped fiber amplifier (7) is entered by the first isolator (6), and first erbium-doped fiber amplifier (7) is by first
The power amplification of road pulsed optical signals is to the power that can excite Brillouin's dynamic raster；First via pulsed light after amplifying power
Signal passes through the first Polarization Controller (8) so that the polarization state and sensor fibre of the first via pulsed optical signals after amplifying power
The parallel position of fast axle；
Second tunnel pump light signals of photo-coupler (2) output are modulated into the second road arteries and veins via third electrooptic modulator (10)
Pulsed light signal enters the second erbium-doped fiber amplifier (12), second Erbium-doped fiber amplifier by the second isolator (11)
Device (12) is by the power amplification of the second road pulsed optical signals to the power that can excite Brillouin's dynamic raster；After amplifying power
First via pulsed optical signals pass through the second Polarization Controller (13) so that the polarization of the first via pulsed optical signals after amplifying power
The state position parallel with the fast axle of sensor fibre；
The input terminal of the sensor fibre (9) connects first Polarization Controller (8), the output terminal of the sensor fibre (9)
The input terminal of polarization beam apparatus (14) is connected respectively with the output terminal of second Polarization Controller (13), via the polarization point
The first via pulsed optical signals of beam device (14) and the second road pulsed optical signals generation position and width in sensor fibre (9) are adjustable
Brillouin's dynamic raster；
The output of the input terminal connection second laser (15) of acousto-optic modulator (16), and export modulated pulse detection light warp
Third Polarization Controller (19) is input to by third erbium-doped fiber amplifier (18), wherein, third erbium-doped fiber amplifier (18)
By the power amplification of pulse detection light to the power that can read Brillouin's dynamic raster, the third Polarization Controller (19) will
The polarization state of pulse detection light after power amplification is adjusted to the position parallel with the slow axis of sensor fibre (9)；
Pass through the optical circulator (20), polarization beam apparatus (14) via the pulse detection light of the third Polarization Controller (19)
Into after sensor fibre (9), after being reflected by Brillouin's dynamic raster, into photodetector (21),
The electric signal of data collecting system (22) the acquisition photodetector (21), and it is transmitted to host computer.
4. distribution hydrostatic sensor system according to claim 3, which is characterized in that
The distribution hydrostatic sensor further includes, microwave signal generator (5) and pulse signal generator (17)；
The microwave signal 11GHz that the microwave signal generator (5) generates drives the second electrooptic modulator (4)；
The pulse signal that pulse signal generator (17) generates respectively drives the first electrooptic modulator (3), third electrooptic modulator
(10) and acousto-optic modulator (16)；
Wherein, the rising edge for being used to drive the pulse signal of acousto-optic modulator (16) that the pulse signal generator (17) generates
Time point and pulse signal generator (17) generate for driving the rising edge of the pulse signal of the first electrooptic modulator (3)
Time point between time difference be less than phonon service life.
5. distribution hydrostatic sensor system according to claim 3, which is characterized in that
The distribution hydrostatic sensor further includes, pulse signal generator (17)；
The pulse signal that pulse signal generator (17) generates respectively drives the first electrooptic modulator (3), third electrooptic modulator
(10) and acousto-optic modulator (16).
6. distribution hydrostatic sensor system according to claim 3, which is characterized in that
The laser frequency for detection that the second laser (15) generates generates cloth than being used for of generating of first laser device (1)
In deep dynamic raster the low birefringence frequency displacement 40-60GHz of laser frequency.
7. distribution hydrostatic sensor system according to claim 3, which is characterized in that
The pipeline of hydraulic pressure to be measured is oil-gas pipeline.
8. distribution hydrostatic sensor system according to claim 3, which is characterized in that corresponding with first laser device (1)
The pulsewidth of two pumping pulse light is 2ns~100ns.
9. distribution hydrostatic sensor system according to claim 3, which is characterized in that the pulsewidth of the pulse detection light
For 2ns~100ns.
10. distribution hydrostatic sensor system according to claim 3, which is characterized in that pulse detection light is in time
Lag the pumping pulse light 1ns~10ns.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107764461A (en) * | 2017-11-28 | 2018-03-06 | 南方科技大学 | Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764461A (en) * | 2017-11-28 | 2018-03-06 | 南方科技大学 | Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating |
| CN107764461B (en) * | 2017-11-28 | 2023-10-20 | 南方科技大学 | Distributed hydraulic sensor system based on Brillouin dynamic grating |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
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