CN109186736A - It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method - Google Patents
It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method Download PDFInfo
- Publication number
- CN109186736A CN109186736A CN201810789456.9A CN201810789456A CN109186736A CN 109186736 A CN109186736 A CN 109186736A CN 201810789456 A CN201810789456 A CN 201810789456A CN 109186736 A CN109186736 A CN 109186736A
- Authority
- CN
- China
- Prior art keywords
- light
- brillouin
- coupler
- photo
- sensor fibre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses it is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device measurement method, characterized in that include the following steps: 1) to obtain the BGS in sensor fibre with spectrum analyzer；2) single mode optical fiber is chosen；3) continuous probe light is generated；4) difference for generating frequency and the continuous light frequency in upper road is the pulse pump light of the intrinsic brillouin gain spectrum full width at half maximum half of sensor fibre；5) excited Brillouin effect is generated；6) signal light of back scattering is generated；7) data acquisition and procession；8) vibration frequency on sensor fibre is demodulated.The effective far measuring distance of this method, application method are simple, convenient for operation, can detect dynamic strain quickly to achieve the purpose that vibration measuring is dynamic.The present invention also discloses it is a kind of can the slope of fixing frequency displacement structure assist Brillouin fiber optic sensing vibration measurement device.
Description
Technical field
The present invention relates to sensory field of optic fibre, relate generally to slope auxiliary Brillouin optical time domain analysis (Slope-
Assisted BOTDA, abbreviation SA-BOTDA) technology vibration measuring dynamic method for sensing and device, it is specifically a kind of can fixing frequency displacement knot
The slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method of structure.
Technical background
In the 1970s, with the development of optical fiber and Fibre Optical Communication Technology, optical fiber sensing technology starts to start to walk.Optical fiber passes
Sense technology have electromagnetism interference, corrosion-resistant, light weight, small in size, reusable, can the superiority such as networking, can to rotation plus
A variety of physical and chemical parameters such as speed, electromagnetic field, temperature, pressure, stress, sound, vibration, humidity, viscosity, refractive index, concentration carry out
Sensing, therefore before the fields such as aerospace, petrochemical industry, electron electric power, civil engineering, biological medicine have a wide range of applications
Scape, the technology have at home and abroad caused research boom and have been continued into the present since foundation, are based particularly on Rayleigh scattering, Raman dissipates
It penetrates, the Distributed Optical Fiber Sensing Techniques of Brillouin scattering.
Brillouin optical time domain analysis (Brillouin Optical Time-Domain based on Brillouin scattering principle
Analysis, abbreviation BOTDA) technology be a gate pole with prospects strain and temperature monitoring technique, it is existed using pulsed light
Stimulated Brillouin scattering (Stimulated Brillouin Scattering, abbreviation SBS) effect and optical time domain in optical fiber is anti-
(Optical Time-Domain Reflectometry, abbreviation OTDR) technology is penetrated to realize the long range of temperature and strain
Full distributed measurement, the detection and monitoring of the health status suitable for large structure.1989, Japanese Anthem company
Horiguchi and British scholar Culverhouse et al. independently find optical fiber Brillouin frequency displacement it is its corresponding strain and
Since temperature line relationship, obtained in terms of test macro and engineer application based on the sensing technology of Brillouin scattering rapidly
Development, at present in the fields such as petroleum gas, civil engineering structure, Geological Hazards Investigation and prevention, aerospace test
It is widely applied, complies fully with the demand of large scale structure health monitoring.The Xiaoyi Bao of Canadian Ottawa university is taught
The group for awarding leader obtains continuous progress in the field always for many years.
Traditional BOTDA system need to be injected separately into the pump light that transmits in opposite directions and detection light at optical fiber both ends, when pump light with
When the difference on the frequency for detecting light is Brillouin shift, stimulated Brillouin scattering effect will occur in sensor fibre, by direct
Detecting the detection light after stimulated Brillouin scattering acts on can be realized the measurement of distributed temperature, strain.At traditional BOTDA points
In cloth measurement, Brillouin scattering generally is realized in such a way that the difference on the frequency to pump light and detection light performs a scan
The measurement of gain spectral (Brillouin gain spectrum, abbreviation BGS), passes through the brillouin frequency of Brillouin scattering gain spectral
Information is moved to realize the parsing of static temperature strain.Traditional BOTDA system needs relatively time-consuming average and frequency sweep process, only
It is suitable for carrying out static or slow strain measurement.
In order to measure complete brillouin gain spectrum or big strain/temperature range, need to expand swept frequency range, meanwhile, such as
Fruit will obtain more accurate BGS curve, need smaller sweep interval.Frequency interval can be increased using slope auxiliary law, had
Effect ground reduces frequency sweep number, improves sample rate, saves time of measuring.Romeo Bernini in 2009 et al. utilizes BGS's
SA-BOTDA system has been built on unilateral slope, which is simply approximately linearity range by the side slope of BGS, according to pre-
The unilateral side the BGS ramp data first measured can fit linear function, then set the difference on the frequency of pump light and detection light
In the half of BGS full width at half maximum.If the strain of optical fiber position changes, the entire BGS of the position can be changed correspondingly,
The intensity size of Brillouin signal can change with the variation for being excited the deep frequency displacement of scattering in cloth of optical fiber in this way, by that will acquire
The intensity of Brillouin signal bring linear function into and can demodulate corresponding strain value.The technology may be implemented to temperature and answer
The dynamic of change measures.
It needs to inject light source at the both ends of optical fiber in traditional BOTDA system, therefore effective distance sensing of system only has
The half of nominal distance sensing, while both ends injection light source uses in actual measurement and inconvenience, and needs to compare expense
When average and frequency sweep process, be only suitable for carrying out static state or slow strain measurement.And traditional BOTDA system needs high frequency micro-
The electric light frequency shifter of wave signal source and High Extinction Ratio to local oscillator light or detection light carry out frequency displacement, significantly increase system at
This.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, and provide it is a kind of can fixing frequency displacement structure slope auxiliary cloth
In deep Fibre Optical Sensor vibration measurement device and measurement method.This installation cost is low, application method is simple, single-ended convenient for operation
Structure can solve the problem of actual measurement distance is the half of fiber lengths in traditional both-end BOTDA system.This method
Effective far measuring distance, application method are simple, convenient for operation, can detect dynamic strain quickly to achieve the purpose that vibration measuring is dynamic.
Realizing the technical solution of the object of the invention is:
It is a kind of can fixing frequency displacement structure slope assist Brillouin fiber optic sensing vibration measurement device, unlike the prior art
It is, including narrow linewidth laser, the first photo-coupler, EDFA Erbium-Doped Fiber Amplifier, the second photo-coupler, the second optical circulator；
Can fixing frequency displacement unit, it is described can fixing frequency displacement unit include the first optical circulator and the port c by the first optical circulator
Third photo-coupler, optoisolator, Polarization Controller, the single mode optical fiber of sequential connection, wherein optoisolator and third optical coupling
The connection of the road Qi Xia exit end, one end of single mode optical fiber are connect with Polarization Controller, and the other end of single mode optical fiber accesses the first light
The port b of circulator；
Pulse modulation unit, the pulse modulation unit are equipped with pulse-modulator, and pulse-modulator 9 is the continuous light tune after frequency displacement
Pulse pump light is made；
Single-ended structure unit, the single-ended structure unit include the sensor fibre to link together and FC/PC optical connector；
Signal processing unit, the signal processing unit include the photodetector and data processing unit being linked in sequence；
Narrow linewidth laser is connect with the incidence end of the first photo-coupler, road and the second optocoupler on the exit end of the first photo-coupler
Road connects in the incidence end of clutch, and road is connect with erbium-doped fiber amplifier under the exit end of the first photo-coupler, and Er-doped fiber is put
The other end of big device with can connect the port a of the first optical circulator in fixing frequency displacement unit, can third light in fixing frequency displacement unit
The upper road exit end of coupler is connect with the pulse-modulator in pulse modulation unit, and pulse-modulator enters with the second photo-coupler
The connection of the road She Duanxia, the exit end of the second photo-coupler connect with the end a of the second optical circulator, the end b of the second optical circulator and
The connection of single-ended structure unit, the end c of the second optical circulator is connect with signal processing unit.
It is described can fixing frequency displacement unit be made from it the first optical circulator of device, third photo-coupler, optoisolator, polarization
Controller and single mode optical fiber constitute annular turbulence cavity.
The single mode optical fiber requires the intrinsic Brillouin shift amount of single mode optical fiber and the intrinsic cloth of sensor fibre in annular chamber
In deep frequency shift amount difference be the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre half, generally obtain light with spectrum analyzer
Fine brillouin gain spectrum.
The sensor fibre is general single mode fiber.
The effect of the optoisolator is the stokes light for preventing high-order.
The effect of the optical polarization controller is the influence for inhibiting polarization state to sensor-based system.
The effect of the EDFA Erbium-Doped Fiber Amplifier is to amplify the power of the continuous light on lower road to enable to generate and be excited in cloth
Deep effect.
Using it is above-mentioned can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device measurement method,
Include the following steps:
1) BGS in sensor fibre is obtained with spectrum analyzer；
2) it chooses single mode optical fiber: obtaining the BGS in annular chamber in single mode optical fiber with spectrum analyzer, and obtained with Lorentz fit
Stimulated Brillouin scattering frequency displacement spectrum in single mode optical fiber, chooses single mode optical fiber, it is desirable that in annular chamber in the intrinsic cloth of single mode optical fiber
Deep frequency shift amount is differed with the intrinsic Brillouin shift amount of sensor fibre as the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre
Half；
3) it generates continuous probe light: tunable laser narrow linewidth laser being made to generate continuous optical signal by the first photo-coupler point
For the continuous light of upper and lower two-way, the upper continuous light in road is as detection light from the first photo-coupler to the second photo-coupler again to second ring of light
Type device eventually enters into sensor fibre；
4) difference for generating frequency and the continuous light frequency in upper road is the arteries and veins of the intrinsic brillouin gain spectrum full width at half maximum half of sensor fibre
Rush pump light: the continuous light in lower road for generating step 3) is amplified into first through erbium-doped fiber amplifier from the first photo-coupler
The port a of optical circulator comes out from the port b subsequently into single mode optical fiber again, after being generated in single mode optical fiber due to brillouin effect
To Brillouin's stokes light, forward continuous light just filtered after Polarization Controller reaches optoisolator, and backward
Brillouin's stokes light can back into the port b of the first optical circulator from single mode optical fiber, from the port c of the first optical circulator
Out, the incidence end of third photo-coupler is finally reached, then arrives the exit end lower port of third photo-coupler, it is last to enter light again
Isolator, this continuous light are just continuously propagated in annular chamber clockwise, some light is emitted from third coupler
The upper port at end, which comes out, reaches electrooptic modulator, and continuous Brillouin's stokes light is modulated into pulse by electrooptic modulator
Light, this pulsed light enter the second optical circulator by the second photo-coupler and finally enter sensor fibre；
5) generate excited Brillouin effect: the pulsed light after the upper continuous road the Guang Hexia frequency displacement in road all enters sensor fibre, is sensing
The continuous light on upper road is reflected can in real time due to rear end equipped with FC/PC connector in optical fiber, this light is just sensed with entrance
The pulsed light of the Brillouin shift of optical fiber generates excited Brillouin effect, is just the BOTDA system of loss-type, wherein enter
Pulsed light serves as pump light, and the reflected continuous light of FC/PC connector serves as detection light；
6) generate the signal light of back scattering: this two-beam is generated since stimulated Brillouin scattering SBS is acted in sensor fibre
The signal light of back scattering enters the port c from the port b of the second optical circulator；
7) data acquisition and procession: the signal light of the port c of the second optical circulator is made to enter back into photodetector and data processing
The analysis and processing of unit progress data；
8) vibration frequency on sensor fibre is demodulated: if the strain of sensor fibre position changes, the entire BGS of the position
It can change correspondingly, the intensity size of Brillouin signal can become with the variation of the stimulated Brillouin scattering frequency displacement of sensor fibre
Change, the corresponding vibration caused by straining can be demodulated by the intensity versus time curve of the Brillouin signal of fitting acquisition
Frequency.
Compared with traditional BOTDA system, frequency shifter structure used in the technical program and traditional high-frequency microwave signal source
It is lower that price is compared with electric light frequency shifter, therefore can reduce cost, and application method is simple, convenient for operation；The technical program makes
This loss-type BOTDA method has effectively measurement apart from farther advantage compared with gain-type BOTDA method；It is single-ended
Structure can solve the problem of actual measurement distance is the half of fiber lengths in traditional both-end BOTDA system；And in conjunction with
Slope auxiliary law and traditional BOTDA technology can detect dynamic strain quickly to achieve the purpose that vibration measuring is dynamic, solve biography
The problem of system BOTDA system is only suitable for static or slow strain measurement.
This installation cost is low, application method is simple, and convenient for operation, single-ended structure can solve traditional both-end BOTDA system
The problem of actual measurement distance is the half of fiber lengths in system.
The effective far measuring distance of this method, application method are simple, convenient for operation, can quickly detect dynamic strain to reach
The purpose moved to vibration measuring.
Detailed description of the invention
Fig. 1 is system structure diagram in embodiment；
Fig. 2 be embodiment in can fixing frequency displacement unit structural schematic diagram；
Fig. 3 is slope auxiliary law schematic illustration in embodiment.
In figure, 1. 2. first photo-coupler of narrow linewidth laser, 3. erbium-doped fiber amplifier, 4. first optical circulator 5.
9. pulse-modulator of single mode optical fiber 6. Polarization Controller, 7. optoisolator, 8. third photo-coupler, 10. second photo-coupler
11. 12. 14. photodetector of sensor fibre 13.FC/PC optical connector of the second optical circulator, 15. data acquisition process mould
Block 16. can 17. pulse modulation unit of fixing frequency displacement unit, 18. single-ended structure unit, 19. signal processing unit.
Specific embodiment
Summary of the invention is further elaborated with reference to the accompanying drawing, but is not limitation of the invention.
Embodiment:
Referring to Fig.1, Fig. 2, it is a kind of can the slope of fixing frequency displacement structure assist Brillouin fiber optic sensing vibration measurement device, including it is narrow
Line width laser 1, the first photo-coupler 2, EDFA Erbium-Doped Fiber Amplifier 3, the second photo-coupler 10, the second optical circulator 11；
Can fixing frequency displacement unit 16, it is described can fixing frequency displacement unit 16 include the first optical circulator 4 and by the first optical circulator 4
C port order connection third photo-coupler 8, optoisolator 7, Polarization Controller 6, single mode optical fiber 5, wherein optoisolator 7 with
The lower road exit end of third photo-coupler 8 connects, and one end of single mode optical fiber 5 is connect with Polarization Controller 6, single mode optical fiber 5 it is another
The port b of the first optical circulator 4 is accessed in one end；
Pulse modulation unit 17, the pulse modulation unit 17 are equipped with pulse-modulator 9, and pulse-modulator 9 is the company after frequency displacement
Continue light modulation into pulse pump light；
Single-ended structure unit 18, the single-ended structure unit 18 include the sensor fibre 12 to link together and FC/PC light connects
Device 13；
Signal processing unit 19, the signal processing unit 19 include the photodetector 14 and data processing unit being linked in sequence
15；
Narrow linewidth laser 1 is connect with the incidence end of the first photo-coupler 2, road and second on the exit end of the first photo-coupler 2
Road connects in the incidence end of photo-coupler 10, and road is connect with erbium-doped fiber amplifier 3 under the exit end of the first photo-coupler 2, mixes
The other end of doped fiber amplifier 3 with can connect the port a of the first optical circulator 4 in fixing frequency displacement unit 16, can fixing frequency displacement
The upper road exit end of third photo-coupler 8 is connect with the pulse-modulator 9 in pulse modulation unit 17 in unit 16, impulse modulation
Device 9 is connect with road under 10 incidence end of the second photo-coupler, the end a of the exit end of the second photo-coupler 10 and the second optical circulator 11
Connection, the end b of the second optical circulator 11 are connect with single-ended structure unit 18, the end c of the second optical circulator 11 and signal processing list
Member 19 connects.
It is described can fixing frequency displacement unit 16 be made from it the first optical circulator of device 4, third photo-coupler 8, optoisolator
7, Polarization Controller 6 and single mode optical fiber 5 constitute annular turbulence cavity.
The intrinsic Brillouin shift amount of single mode optical fiber 5 and consolidating for sensor fibre in the requirement annular chamber of the single mode optical fiber 5
Having Brillouin shift amount difference is the half of the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre 12, generally uses spectrum analyzer
Obtain the brillouin gain spectrum of optical fiber.
The sensor fibre 12 is general single mode fiber.
The effect of the optoisolator 7 is the stokes light for preventing high-order.
The effect of the optical polarization controller 6 is the influence for inhibiting polarization state to sensor-based system.
The effect of the EDFA Erbium-Doped Fiber Amplifier 3 is to amplify the power of the continuous light on lower road to enable to generate and be excited in cloth
Deep effect.
Referring to Fig.1, Fig. 2, Fig. 3, using it is above-mentioned can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sense vibration survey
The measurement method for measuring device, includes the following steps:
1) BGS in sensor fibre 12 is obtained with spectrum analyzer；
2) it chooses single mode optical fiber 5: obtaining the BGS in single mode optical fiber 5 with spectrum analyzer, and obtain single-mode optics with Lorentz fit
Stimulated Brillouin scattering frequency displacement spectrum in fibre 5, it is desirable that the intrinsic Brillouin shift amount and sensor fibre of single mode optical fiber 5 in annular chamber
12 intrinsic Brillouin shift amount difference is the half of the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre 12；
3) it generates continuous probe light: tunable laser narrow linewidth laser 1 being made to generate continuous optical signal by the first photo-coupler 2
It is divided into two-way continuous light up and down, the upper continuous light in road is as detection light from first the 2 to the second photo-coupler of photo-coupler 10 again to the
Two smooth annular devices 11 eventually enter into sensor fibre 12；
4) difference for generating frequency and the continuous light frequency in upper road is the arteries and veins of the intrinsic brillouin gain spectrum full width at half maximum half of sensor fibre
Rush pump light: the continuous light in lower road for generating step 3) is amplified into the through erbium-doped fiber amplifier 3 from the first photo-coupler 2
The port a of one optical circulator 4 comes out from the port b subsequently into single mode optical fiber 5, due to brillouin effect in single mode optical fiber 5 again
Backward Brillouin's stokes light is generated, forward continuous light is just filtered after Polarization Controller 6 reaches optoisolator 7,
And backward Brillouin's stokes light can back into the port b of the first optical circulator 4 from single mode optical fiber 5, from first ring of light
The port c of shape device 4 comes out, and finally reaches the incidence end of third photo-coupler 8, then arrive the exit end lower end of third photo-coupler 8
Mouthful, last to enter optoisolator 7 again, this continuous light just continuously propagation clockwise in annular chamber, some light from
The upper port of exit end, which comes out, in third coupler 8 reaches electrooptic modulator 9, by electrooptic modulator 9 continuous Brillouin
Stokes light is modulated into pulsed light, this pulsed light finally enters biography into the second optical circulator 11 by the second photo-coupler 10
Photosensitive fine 12；
5) generate excited Brillouin effect: the pulsed light after the upper continuous road the Guang Hexia frequency displacement in road all enters sensor fibre 12, is passing
The continuous light on upper road reflected can in real time due to rear end equipped with FC/PC connector 13 in photosensitive fine 12, this light just with into
The pulsed light for entering the Brillouin shift of sensor fibre 12 generates excited Brillouin effect, is just the BOTDA system of loss-type,
The pulsed light of middle entrance serves as pump light, and the reflected continuous light of FC/PC connector 13 serves as detection light；
6) generate the signal light of back scattering: this two-beam is produced since stimulated Brillouin scattering SBS is acted in sensor fibre 12
The signal light of raw back scattering enters the port c from the port b of the second optical circulator 11；
7) data acquisition and procession: the signal light of the port c of the second optical circulator 11 is made to enter back into photodetector 14 and data
The analysis and processing of the progress data of processing unit 15；
8) demodulate sensor fibre on vibration frequency: if the strain of 12 certain position of sensor fibre changes, the position it is entire
BGS can be changed correspondingly, and the intensity size of Brillouin signal can be with the variation of the stimulated Brillouin scattering frequency displacement of sensor fibre 12
And change, it can be demodulated by the intensity versus time curve of the Brillouin signal of fitting acquisition corresponding as caused by straining
Vibration frequency.
Claims (5)
1. one kind can fixing frequency displacement structure slope assist Brillouin fiber optic sensing vibration measurement device, characterized in that including narrow
Line width laser, the first photo-coupler, EDFA Erbium-Doped Fiber Amplifier, the second photo-coupler, the second optical circulator；
Can fixing frequency displacement unit, it is described can fixing frequency displacement unit include the first optical circulator and the port c by the first optical circulator
Third photo-coupler, optoisolator, Polarization Controller, the single mode optical fiber of sequential connection, wherein optoisolator and third optical coupling
The connection of the road Qi Xia exit end, one end of single mode optical fiber are connect with Polarization Controller, and the other end of single mode optical fiber accesses the first light
The port b of circulator；
Pulse modulation unit, the pulse modulation unit are equipped with pulse-modulator；
Single-ended structure unit, the single-ended structure unit include the sensor fibre to link together and FC/PC optical connector；
Signal processing unit, the signal processing unit include the photodetector and data processing unit being linked in sequence；
Narrow linewidth laser is connect with the incidence end of the first photo-coupler, road and the second optocoupler on the exit end of the first photo-coupler
Road connects in the incidence end of clutch, and road is connect with erbium-doped fiber amplifier under the exit end of the first photo-coupler, and Er-doped fiber is put
The other end of big device with can connect the port a of the first optical circulator in fixing frequency displacement unit, can third light in fixing frequency displacement unit
The upper road exit end of coupler is connect with the pulse-modulator in pulse modulation unit, and pulse-modulator enters with the second photo-coupler
The connection of the road She Duanxia, the exit end of the second photo-coupler connect with the end a of the second optical circulator, the end b of the second optical circulator and
The connection of single-ended structure unit, the end c of the second optical circulator is connect with signal processing unit.
2. it is according to claim 1 can fixing frequency displacement structure slope assist Brillouin fiber optic sensing vibration measurement device,
It is characterized in that it is described can fixing frequency displacement unit be made from it the first optical circulator of device, third photo-coupler, optoisolator, partially
Shake controller and the annular turbulence cavity of single mode optical fiber composition.
3. it is according to claim 1 can fixing frequency displacement structure slope assist Brillouin fiber optic sensing vibration measurement device,
It is characterized in that the single mode optical fiber requires the intrinsic Brillouin shift amount of single mode optical fiber and the intrinsic cloth of sensor fibre in annular chamber
In deep frequency shift amount difference be the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre half.
4. it is according to claim 1 can fixing frequency displacement structure slope assist Brillouin fiber optic sensing vibration measurement device,
It is characterized in that the sensor fibre is general single mode fiber.
5. using described in any one of claim 1-4 can the slope of fixing frequency displacement structure assist Brillouin fiber optic sensing vibration measurement
The measurement method of device, characterized in that include the following steps:
1) BGS in sensor fibre is obtained with spectrum analyzer；
2) it chooses single mode optical fiber: obtaining the BGS in single mode optical fiber with spectrum analyzer, and obtain single mode optical fiber with Lorentz fit
In stimulated Brillouin scattering frequency displacement spectrum, it is desirable that the intrinsic Brillouin shift amount of single mode optical fiber and consolidating for sensor fibre in annular chamber
Having Brillouin shift amount difference is the half of the intrinsic brillouin gain spectrum full width at half maximum of sensor fibre；
3) it generates continuous probe light: tunable laser narrow linewidth laser being made to generate continuous optical signal by the first photo-coupler point
For the continuous light of upper and lower two-way, the upper continuous light in road is as detection light from the first photo-coupler to the second photo-coupler again to second ring of light
Type device eventually enters into sensor fibre；
4) difference for generating frequency and the continuous light frequency in upper road is the arteries and veins of the intrinsic brillouin gain spectrum full width at half maximum half of sensor fibre
Rush pump light: the continuous light in lower road for generating step 3) is amplified into first through erbium-doped fiber amplifier from the first photo-coupler
The port a of optical circulator comes out from the port b subsequently into single mode optical fiber again, after being generated in single mode optical fiber due to brillouin effect
To Brillouin's stokes light, forward continuous light just filtered after Polarization Controller reaches optoisolator, and backward
Brillouin's stokes light can back into the port b of the first optical circulator from single mode optical fiber, from the port c of the first optical circulator
Out, the incidence end of third photo-coupler is finally reached, then arrives the exit end lower port of third photo-coupler, it is last to enter light again
Isolator, this continuous light are just continuously propagated in annular chamber clockwise, some light is emitted from third coupler
The upper port at end, which comes out, reaches electrooptic modulator, and continuous Brillouin's stokes light is modulated into pulse by electrooptic modulator
Light, this pulsed light enter the second optical circulator by the second photo-coupler and finally enter sensor fibre；
5) generate excited Brillouin effect: the pulsed light after the upper continuous road the Guang Hexia frequency displacement in road all enters sensor fibre, is sensing
The continuous light on upper road is reflected can in real time due to rear end equipped with FC/PC connector in optical fiber, this light is just sensed with entrance
The pulsed light of the Brillouin shift of optical fiber generates excited Brillouin effect, is just the BOTDA system of loss-type, wherein enter
Pulsed light serves as pump light, and the reflected continuous light of FC/PC connector serves as detection light；
6) generate the signal light of back scattering: this two-beam is generated since stimulated Brillouin scattering SBS is acted in sensor fibre
The signal light of back scattering enters the port c from the port b of the second optical circulator；
7) data acquisition and procession: the signal light of the port c of the second optical circulator is made to enter back into photodetector and data processing
The analysis and processing of unit progress data；
8) vibration frequency on sensor fibre is demodulated: if the strain of sensor fibre position changes, the entire BGS of the position
It can change correspondingly, the intensity size of Brillouin signal can become with the variation of the stimulated Brillouin scattering frequency displacement of sensor fibre
Change, the corresponding vibration caused by straining can be demodulated by the intensity versus time curve of the Brillouin signal of fitting acquisition
Frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810789456.9A CN109186736A (en) | 2018-07-18 | 2018-07-18 | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810789456.9A CN109186736A (en) | 2018-07-18 | 2018-07-18 | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109186736A true CN109186736A (en) | 2019-01-11 |
Family
ID=64936184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810789456.9A Pending CN109186736A (en) | 2018-07-18 | 2018-07-18 | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109186736A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110136375A (en) * | 2019-05-31 | 2019-08-16 | 太原理工大学 | A kind of distribution type fiber-optic area outlook system |
| CN110426369A (en) * | 2019-07-30 | 2019-11-08 | 盐城工学院 | A kind of distribution type fiber-optic gas-detecting device and method based on sweep frequency technique |
| CN110579178A (en) * | 2019-10-23 | 2019-12-17 | 华北电力大学（保定） | Method and device for eliminating line width dependence of slope type Brillouin dynamic sensing system |
| CN110887527A (en) * | 2019-12-06 | 2020-03-17 | 厦门大学 | Distributed optical fiber humidity and temperature simultaneous detection device and detection method |
| CN111816961A (en) * | 2020-08-04 | 2020-10-23 | 中国科学院半导体研究所 | High-stability ultra-narrow single-passband microwave photonic filter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2406907A (en) * | 2003-10-10 | 2005-04-13 | Optoplan As | Active coherence reduction for interferometer interrogation |
| CN1973178A (en) * | 2004-06-25 | 2007-05-30 | 光纳株式会社 | Distributed optical fiber sensor |
| CN101144729A (en) * | 2007-09-30 | 2008-03-19 | 南京大学 | Brillouin optical time domain reflection measuring method based on quick fourier transform |
| CN103090894A (en) * | 2013-01-10 | 2013-05-08 | 中国人民解放军国防科学技术大学 | Distributed optical fiber sensing device and method based on Brillouin Er-doped fiber laser |
| CN104792343A (en) * | 2015-05-08 | 2015-07-22 | 广西师范大学 | Single-ended structure dynamic measuring Brillouin optical fiber sensing system and sensing method |
| CN105758433A (en) * | 2016-03-02 | 2016-07-13 | 南昌工程学院 | Distributed optical fiber sensing device based on Brillouin fiber laser |
| CN107764298A (en) * | 2017-12-05 | 2018-03-06 | 广西师范大学 | A kind of single-ended brillouin distributed sensor-based system and method for sensing of the adjustable frequency shifter structure of Brillouin |
-
2018
- 2018-07-18 CN CN201810789456.9A patent/CN109186736A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2406907A (en) * | 2003-10-10 | 2005-04-13 | Optoplan As | Active coherence reduction for interferometer interrogation |
| CN1973178A (en) * | 2004-06-25 | 2007-05-30 | 光纳株式会社 | Distributed optical fiber sensor |
| CN101144729A (en) * | 2007-09-30 | 2008-03-19 | 南京大学 | Brillouin optical time domain reflection measuring method based on quick fourier transform |
| CN103090894A (en) * | 2013-01-10 | 2013-05-08 | 中国人民解放军国防科学技术大学 | Distributed optical fiber sensing device and method based on Brillouin Er-doped fiber laser |
| CN104792343A (en) * | 2015-05-08 | 2015-07-22 | 广西师范大学 | Single-ended structure dynamic measuring Brillouin optical fiber sensing system and sensing method |
| CN105758433A (en) * | 2016-03-02 | 2016-07-13 | 南昌工程学院 | Distributed optical fiber sensing device based on Brillouin fiber laser |
| CN107764298A (en) * | 2017-12-05 | 2018-03-06 | 广西师范大学 | A kind of single-ended brillouin distributed sensor-based system and method for sensing of the adjustable frequency shifter structure of Brillouin |
Non-Patent Citations (3)
| Title |
|---|
| ALDO MINARDO等: "《Heterodyne slope-assisted Brillouin optical time-domain analysis for dynamic strain measurements》", 《JOURNAL OF OPTICS》 * |
| ROMEO BERNINI等: "《Dynamic strain measurement in optical fibers by stimulated Brillouin scattering》", 《OPTICS LETTERS》 * |
| 尚秋峰等: "《基于BOTDA的动态测量技术研究进展》", 《激光与光电子学进展》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110136375A (en) * | 2019-05-31 | 2019-08-16 | 太原理工大学 | A kind of distribution type fiber-optic area outlook system |
| CN110426369A (en) * | 2019-07-30 | 2019-11-08 | 盐城工学院 | A kind of distribution type fiber-optic gas-detecting device and method based on sweep frequency technique |
| CN110579178A (en) * | 2019-10-23 | 2019-12-17 | 华北电力大学（保定） | Method and device for eliminating line width dependence of slope type Brillouin dynamic sensing system |
| CN110887527A (en) * | 2019-12-06 | 2020-03-17 | 厦门大学 | Distributed optical fiber humidity and temperature simultaneous detection device and detection method |
| CN110887527B (en) * | 2019-12-06 | 2024-06-11 | 厦门大学 | Device and method for simultaneously detecting humidity and temperature of distributed optical fibers |
| CN111816961A (en) * | 2020-08-04 | 2020-10-23 | 中国科学院半导体研究所 | High-stability ultra-narrow single-passband microwave photonic filter |
| CN111816961B (en) * | 2020-08-04 | 2021-08-27 | 中国科学院半导体研究所 | High-stability ultra-narrow single-passband microwave photonic filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Physics and applications of Raman distributed optical fiber sensing | |
| CN109186736A (en) | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method | |
| CN206496768U (en) | A kind of phase sensitive optical time domain reflectometer based on chirp | |
| CN104677396B (en) | Dynamic distributed Brillouin optical fiber sensing device and method | |
| Peled et al. | Monitoring the propagation of mechanical waves using an optical fiber distributed and dynamic strain sensor based on BOTDA | |
| CN107917738A (en) | A kind of while measurement temperature, strain and the distributed optical fiber sensing system of vibration | |
| CN106643832A (en) | Phase-sensitive optical time-domain reflectometer based on linear frequency-modulation pulse and measurement method of phase-sensitive optical time-domain reflectometer | |
| Song et al. | Applications of Brillouin dynamic grating to distributed fiber sensors | |
| CN102759371A (en) | COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer | |
| CN102607621A (en) | Distributed optical fiber Brillouin sensing device and method thereof for detecting temperature and strain synchronously | |
| CN106525096B (en) | A kind of brillouin distributed optical fiber sensing device and reduce gain spectral line width method | |
| CN105371785B (en) | A kind of curvature measurement method | |
| CN104792343A (en) | Single-ended structure dynamic measuring Brillouin optical fiber sensing system and sensing method | |
| CN107478352B (en) | Distributed sensing method and system based on Brillouin scattering and fused chaotic light signals | |
| CN103207033A (en) | Distributed fiber sensing method and device for simultaneously measuring temperature and strain | |
| Wu et al. | Few-mode optical fiber based simultaneously distributed curvature and temperature sensing | |
| Yüksel | Optical fiber sensor system for remote and multi-point refractive index measurement | |
| CN103940501B (en) | A kind of BOTDA distributed vibration sensing system based on dynamic phasing demodulation | |
| CN204439100U (en) | Dynamic distributed Brillouin light fiber sensing equipment | |
| CN103616091A (en) | Distributed optical fiber temperature and stress sensing device | |
| CN102589748A (en) | Environmental temperature measurement method based on optical fiber Rayleigh and Brillouin principle | |
| CN203310428U (en) | Distributed Brillouin optical fiber sensing system based on coherent detection | |
| CN105973501A (en) | Long-distance high-spatial-resolution Raman temperature measurement sensor and realization method thereof | |
| CN107764461B (en) | Distributed hydraulic sensor system based on Brillouin dynamic grating | |
| CN108801305B (en) | Method and device of Brillouin optical time domain reflectometer based on step pulse self-amplification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190111 |